mirror of
https://github.com/fofolee/uTools-Manuals.git
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475 lines
15 KiB
HTML
475 lines
15 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<title>将字符转换为 HTML 转义字符</title>
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</head>
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<body class="docs"><div id="layout">
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<div id="layout-content"><div id="function.htmlentities" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">htmlentities</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">htmlentities</span> — <span class="dc-title">将字符转换为 HTML 转义字符</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.htmlentities-description">
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<h3 class="title">说明</h3>
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<div class="methodsynopsis dc-description">
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<span class="methodname"><strong>htmlentities</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$string</code></span>
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[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$flags</code><span class="initializer"> = ENT_COMPAT | ENT_HTML401</span></span>
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[, <span class="methodparam"><span class="type">string</span> <code class="parameter">$encoding</code><span class="initializer"> = ini_get("default_charset")</span></span>
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[, <span class="methodparam"><span class="type">bool</span> <code class="parameter">$double_encode</code><span class="initializer"> = true</span></span>
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]]] ) : <span class="type">string</span></div>
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<p class="para rdfs-comment">
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本函数各方面都和 <span class="function"><a href="htmlspecialchars.html" class="function">htmlspecialchars()</a></span> 一样，
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除了 <span class="function"><strong>htmlentities()</strong></span> 会转换所有具有 HTML 实体的字符。
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</p>
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<p class="para">
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如果要解码（反向操作），可以使用 <span class="function"><a href="html_entity_decode.html" class="function">html_entity_decode()</a></span>。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.htmlentities-parameters">
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<h3 class="title">参数</h3>
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<p class="para">
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<dl>
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<dt>
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<code class="parameter">string</code></dt>
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<dd>
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<p class="para">
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输入字符。
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</p>
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</dd>
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<dt>
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<code class="parameter">flags</code></dt>
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<dd>
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<p class="para">
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以下一组位掩码标记，用于设置如何处理引号、无效代码序列、使用文档的类型。
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默认是
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<em>ENT_COMPAT | ENT_HTML401</em>。
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<table class="doctable table">
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<caption><strong>有效 <code class="parameter">flags</code> 标记常量</strong></caption>
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<thead>
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<tr>
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<th>常量名</th>
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<th>描述</th>
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</tr>
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</thead>
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<tbody class="tbody">
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<tr>
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<td><strong><code>ENT_COMPAT</code></strong></td>
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<td>会转换双引号，不转换单引号。</td>
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</tr>
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<tr>
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<td><strong><code>ENT_QUOTES</code></strong></td>
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<td>既转换双引号也转换单引号。</td>
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</tr>
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<tr>
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<td><strong><code>ENT_NOQUOTES</code></strong></td>
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<td>单/双引号都不转换</td>
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</tr>
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<tr>
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<td><strong><code>ENT_IGNORE</code></strong></td>
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<td>
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静默丢弃无效的代码单元序列，而不是返回空字符串。
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不建议使用此标记，
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因为它<a href="http://unicode.org/reports/tr36/#Deletion_of_Noncharacters" class="link external">» 可能有安全影响</a>。
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</td>
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</tr>
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<tr>
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<td><strong><code>ENT_SUBSTITUTE</code></strong></td>
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<td>
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替换无效的代码单元序列为 Unicode 代替符（Replacement Character），
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U+FFFD (UTF-8) 或者 &#xFFFD; (其他)，而不是返回空字符串。
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</td>
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</tr>
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<tr>
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<td><strong><code>ENT_DISALLOWED</code></strong></td>
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<td>
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为文档的无效代码点替换为 Unicode 代替符（Replacement Character）：
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U+FFFD (UTF-8)，或 &#xFFFD;（其他），而不是把它们留在原处。
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比如以下情况下就很有用：要保证 XML 文档嵌入额外内容时格式合法。
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</td>
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</tr>
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<tr>
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<td><strong><code>ENT_HTML401</code></strong></td>
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<td>
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以 HTML 4.01 处理代码。
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</td>
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</tr>
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<tr>
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<td><strong><code>ENT_XML1</code></strong></td>
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<td>
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以 XML 1 处理代码。
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</td>
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</tr>
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<tr>
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<td><strong><code>ENT_XHTML</code></strong></td>
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<td>
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以 XHTML 处理代码。
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</td>
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</tr>
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<tr>
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<td><strong><code>ENT_HTML5</code></strong></td>
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<td>
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以 HTML 5 处理代码。
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</td>
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</tr>
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</tbody>
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</table>
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</p>
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</dd>
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<dt>
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<code class="parameter">encoding</code></dt>
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<dd>
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<p class="para">
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An optional argument defining the encoding used when converting characters.
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</p>
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<p class="para">
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If omitted, the default value of the <code class="parameter">encoding</code> varies
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depending on the PHP version in use. In PHP 5.6 and later, the
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<a href="ini.core.html#ini.default-charset" class="link">default_charset</a> configuration
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option is used as the default value. PHP 5.4 and 5.5 will use
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<em>UTF-8</em> as the default. Earlier versions of PHP use
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<em>ISO-8859-1</em>.
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</p>
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<p class="para">
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Although this argument is technically optional, you are highly encouraged to
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specify the correct value for your code if you are using PHP 5.5 or earlier,
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or if your <a href="ini.core.html#ini.default-charset" class="link">default_charset</a>
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configuration option may be set incorrectly for the given input.
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</p>
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<p class="para">
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支持以下字符集：
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<table class="doctable table">
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<caption><strong>支持的字符集列表</strong></caption>
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<thead>
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<tr>
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<th>字符集</th>
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<th>别名</th>
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<th>描述</th>
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</tr>
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</thead>
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<tbody class="tbody">
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<tr>
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<td>ISO-8859-1</td>
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<td>ISO8859-1</td>
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<td>
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西欧，Latin-1
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</td>
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</tr>
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<tr>
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<td>ISO-8859-5</td>
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<td>ISO8859-5</td>
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<td>
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Little used cyrillic charset (Latin/Cyrillic).
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</td>
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</tr>
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<tr>
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<td>ISO-8859-15</td>
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<td>ISO8859-15</td>
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<td>
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西欧，Latin-9。增加欧元符号，法语和芬兰语字母在 Latin-1(ISO-8859-1) 中缺失。
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</td>
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</tr>
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<tr>
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<td>UTF-8</td>
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<td class="empty"> </td>
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<td>
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ASCII 兼容的多字节 8 位 Unicode。
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</td>
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</tr>
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<tr>
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<td>cp866</td>
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<td>ibm866, 866</td>
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<td>
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DOS 特有的西里尔编码。本字符集在 4.3.2 版本中得到支持。
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</td>
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</tr>
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<tr>
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<td>cp1251</td>
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<td>Windows-1251, win-1251, 1251</td>
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<td>
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Windows 特有的西里尔编码。本字符集在 4.3.2 版本中得到支持。
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</td>
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</tr>
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<tr>
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<td>cp1252</td>
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<td>Windows-1252, 1252</td>
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<td>
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Windows 特有的西欧编码。
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</td>
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</tr>
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<tr>
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<td>KOI8-R</td>
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<td>koi8-ru, koi8r</td>
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<td>
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俄语。本字符集在 4.3.2 版本中得到支持。
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</td>
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</tr>
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<tr>
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<td>BIG5</td>
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<td>950</td>
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<td>
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繁体中文，主要用于中国台湾省。
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</td>
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</tr>
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<tr>
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<td>GB2312</td>
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<td>936</td>
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<td>
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简体中文，中国国家标准字符集。
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</td>
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</tr>
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<tr>
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<td>BIG5-HKSCS</td>
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<td class="empty"> </td>
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<td>
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繁体中文，附带香港扩展的 Big5 字符集。
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</td>
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</tr>
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<tr>
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<td>Shift_JIS</td>
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<td>SJIS, 932</td>
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<td>
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日语
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</td>
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</tr>
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<tr>
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<td>EUC-JP</td>
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<td>EUCJP</td>
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<td>
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日语
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</td>
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</tr>
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<tr>
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<td>MacRoman</td>
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<td class="empty"> </td>
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<td>
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Mac OS 使用的字符串。
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</td>
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</tr>
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<tr>
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<td><em>''</em></td>
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<td class="empty"> </td>
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<td>
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An empty string activates detection from script encoding (Zend multibyte),
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<a href="ini.core.html#ini.default-charset" class="link">default_charset</a> and current
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locale (see <span class="function"><a href="nl_langinfo.html" class="function">nl_langinfo()</a></span> and
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<span class="function"><a href="setlocale.html" class="function">setlocale()</a></span>), in this order. Not recommended.
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</td>
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</tr>
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</tbody>
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</table>
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<blockquote class="note"><p><strong class="note">Note</strong>:
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<span class="simpara">
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其他字符集没有认可。将会使用默认编码并抛出异常。
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</span>
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</p></blockquote>
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</p>
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</dd>
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<dt>
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<code class="parameter">double_encode</code></dt>
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<dd>
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<p class="para">
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关闭 <code class="parameter">double_encode</code> 时，PHP 不会转换现有的 HTML 实体，
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默认是全部转换。
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</p>
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</dd>
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</dl>
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</p>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.htmlentities-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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返回编码后的字符。
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</p>
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<p class="para">
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如果指定的编码 <code class="parameter">encoding</code> 里，
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<code class="parameter">string</code> 包含了无效的代码单元序列，
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没有设置 <strong><code>ENT_IGNORE</code></strong> 或者
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<strong><code>ENT_SUBSTITUTE</code></strong> 标记的情况下，会返回空字符串。
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</p>
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</div>
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<div class="refsect1 changelog" id="refsect1-function.htmlentities-changelog">
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<h3 class="title">更新日志</h3>
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<p class="para">
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<table class="doctable informaltable">
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<thead>
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<tr>
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<th>版本</th>
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<th>说明</th>
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</tr>
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</thead>
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<tbody class="tbody">
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<tr>
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<td>5.6.0</td>
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<td>
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The default value for the <code class="parameter">encoding</code> parameter was
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changed to be the value of the
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<a href="ini.core.html#ini.default-charset" class="link">default_charset</a> configuration
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option.
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</td>
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</tr>
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<tr>
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<td>5.4.0</td>
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<td>
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<code class="parameter">encoding</code> 参数的默认值改成 UTF-8。
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</td>
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</tr>
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<tr>
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<td>5.4.0</td>
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<td>
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增加常量 <strong><code>ENT_SUBSTITUTE</code></strong>、 <strong><code>ENT_DISALLOWED</code></strong>、
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<strong><code>ENT_HTML401</code></strong>、 <strong><code>ENT_XML1</code></strong>、
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<strong><code>ENT_XHTML</code></strong>、 <strong><code>ENT_HTML5</code></strong>。
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</td>
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</tr>
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<tr>
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<td>5.3.0</td>
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<td>
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增加常量 <strong><code>ENT_IGNORE</code></strong>。
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</td>
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</tr>
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<tr>
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<td>5.2.3</td>
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<td>
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增加参数 <code class="parameter">double_encode</code>。
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</td>
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</tr>
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</tbody>
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</table>
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.htmlentities-examples">
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<h3 class="title">范例</h3>
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<p class="para">
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<div class="example" id="example-5911">
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<p><strong>Example #1 <span class="function"><strong>htmlentities()</strong></span> 例子</strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br />$str </span><span style="color: #007700">= </span><span style="color: #DD0000">"A 'quote' is <b>bold</b>"</span><span style="color: #007700">;<br /><br /></span><span style="color: #FF8000">// 输出: A 'quote' is &lt;b&gt;bold&lt;/b&gt;<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">htmlentities</span><span style="color: #007700">(</span><span style="color: #0000BB">$str</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// 输出: A &#039;quote&#039; is &lt;b&gt;bold&lt;/b&gt;<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">htmlentities</span><span style="color: #007700">(</span><span style="color: #0000BB">$str</span><span style="color: #007700">, </span><span style="color: #0000BB">ENT_QUOTES</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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</div>
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</p>
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<p class="para">
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<div class="example" id="example-5912">
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<p><strong>Example #2 <strong><code>ENT_IGNORE</code></strong> 用法示例</strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br />$str </span><span style="color: #007700">= </span><span style="color: #DD0000">"\x8F!!!"</span><span style="color: #007700">;<br /><br /></span><span style="color: #FF8000">// 输出空 string<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">htmlentities</span><span style="color: #007700">(</span><span style="color: #0000BB">$str</span><span style="color: #007700">, </span><span style="color: #0000BB">ENT_QUOTES</span><span style="color: #007700">, </span><span style="color: #DD0000">"UTF-8"</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// 输出 "!!!"<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">htmlentities</span><span style="color: #007700">(</span><span style="color: #0000BB">$str</span><span style="color: #007700">, </span><span style="color: #0000BB">ENT_QUOTES </span><span style="color: #007700">| </span><span style="color: #0000BB">ENT_IGNORE</span><span style="color: #007700">, </span><span style="color: #DD0000">"UTF-8"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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</div>
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</p>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.htmlentities-seealso">
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<h3 class="title">参见</h3>
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<p class="para">
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<ul class="simplelist">
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<li class="member"><span class="function"><a href="html_entity_decode.html" class="function" rel="rdfs-seeAlso">html_entity_decode()</a> - Convert HTML entities to their corresponding characters</span></li>
|
||
<li class="member"><span class="function"><a href="get_html_translation_table.html" class="function" rel="rdfs-seeAlso">get_html_translation_table()</a> - 返回使用 htmlspecialchars 和 htmlentities 后的转换表</span></li>
|
||
<li class="member"><span class="function"><a href="htmlspecialchars.html" class="function" rel="rdfs-seeAlso">htmlspecialchars()</a> - 将特殊字符转换为 HTML 实体</span></li>
|
||
<li class="member"><span class="function"><a href="nl2br.html" class="function" rel="rdfs-seeAlso">nl2br()</a> - 在字符串所有新行之前插入 HTML 换行标记</span></li>
|
||
<li class="member"><span class="function"><a href="urlencode.html" class="function" rel="rdfs-seeAlso">urlencode()</a> - 编码 URL 字符串</span></li>
|
||
</ul>
|
||
</p>
|
||
</div>
|
||
|
||
|
||
</div></div></div></body></html> |