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153 lines
7.0 KiB
HTML
153 lines
7.0 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>字符串按要求的字符编码来转换</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.iconv" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">iconv</h1>
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<p class="verinfo">(PHP 4 >= 4.0.5, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">iconv</span> — <span class="dc-title">字符串按要求的字符编码来转换</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.iconv-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>iconv</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$in_charset</code></span>
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, <span class="methodparam"><span class="type">string</span> <code class="parameter">$out_charset</code></span>
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, <span class="methodparam"><span class="type">string</span> <code class="parameter">$str</code></span>
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) : <span class="type">string</span></div>
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<p class="para rdfs-comment">
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将字符串 <code class="parameter">str</code> 从 <code class="parameter">in_charset</code> 转换编码到 <code class="parameter">out_charset</code>。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.iconv-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">in_charset</code></dt>
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<dd>
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<p class="para">
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输入的字符集。
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</p>
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</dd>
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<dt>
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<code class="parameter">out_charset</code></dt>
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<dd>
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<p class="para">
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输出的字符集。
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</p>
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<p class="para">
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如果你在 <code class="parameter">out_charset</code> 后添加了字符串 <em>//TRANSLIT</em>，将启用转写（transliteration）功能。这个意思是，当一个字符不能被目标字符集所表示时，它可以通过一个或多个形似的字符来近似表达。
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如果你添加了字符串 <em>//IGNORE</em>，不能以目标字符集表达的字符将被默默丢弃。
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否则，会导致一个 <strong><code>E_NOTICE</code></strong>并返回 <strong><code>FALSE</code></strong>。
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</p>
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<div class="caution"><strong class="caution">Caution</strong>
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<p class="para">
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<em>//TRANSLIT</em> 运行细节高度依赖于系统的 iconv() 实现（参见 <strong><code>ICONV_IMPL</code></strong>）。
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据悉，某些系统上的实现会直接忽略 <em>//TRANSLIT</em>，所以转换也有可能失败，<code class="parameter">out_charset</code> 会是不合格的。
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</p>
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</div>
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</dd>
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<dt>
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<code class="parameter">str</code></dt>
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<dd>
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<p class="para">
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要转换的字符串。
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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.iconv-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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返回转换后的字符串， 或者在失败时返回 <strong><code>FALSE</code></strong>。
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</p>
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</div>
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<div class="refsect1 changelog" id="refsect1-function.iconv-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>5.4.0</td>
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<td>
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这个版本起，字符非法时候会返回 <strong><code>FALSE</code></strong>，除非在输出字符里指定了 <em>//IGNORE</em> 。
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在之前版本，它会返回一部分字符串。
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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.iconv-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-2894">
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<p><strong>Example #1 <span class="function"><strong>iconv()</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 />$text </span><span style="color: #007700">= </span><span style="color: #DD0000">"This is the Euro symbol '€'."</span><span style="color: #007700">;<br /><br />echo </span><span style="color: #DD0000">'Original : '</span><span style="color: #007700">, </span><span style="color: #0000BB">$text</span><span style="color: #007700">, </span><span style="color: #0000BB">PHP_EOL</span><span style="color: #007700">;<br />echo </span><span style="color: #DD0000">'TRANSLIT : '</span><span style="color: #007700">, </span><span style="color: #0000BB">iconv</span><span style="color: #007700">(</span><span style="color: #DD0000">"UTF-8"</span><span style="color: #007700">, </span><span style="color: #DD0000">"ISO-8859-1//TRANSLIT"</span><span style="color: #007700">, </span><span style="color: #0000BB">$text</span><span style="color: #007700">), </span><span style="color: #0000BB">PHP_EOL</span><span style="color: #007700">;<br />echo </span><span style="color: #DD0000">'IGNORE : '</span><span style="color: #007700">, </span><span style="color: #0000BB">iconv</span><span style="color: #007700">(</span><span style="color: #DD0000">"UTF-8"</span><span style="color: #007700">, </span><span style="color: #DD0000">"ISO-8859-1//IGNORE"</span><span style="color: #007700">, </span><span style="color: #0000BB">$text</span><span style="color: #007700">), </span><span style="color: #0000BB">PHP_EOL</span><span style="color: #007700">;<br />echo </span><span style="color: #DD0000">'Plain : '</span><span style="color: #007700">, </span><span style="color: #0000BB">iconv</span><span style="color: #007700">(</span><span style="color: #DD0000">"UTF-8"</span><span style="color: #007700">, </span><span style="color: #DD0000">"ISO-8859-1"</span><span style="color: #007700">, </span><span style="color: #0000BB">$text</span><span style="color: #007700">), </span><span style="color: #0000BB">PHP_EOL</span><span style="color: #007700">;<br /><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 class="example-contents"><p>以上例程的输出类似于：</p></div>
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<div class="example-contents screen">
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<div class="cdata"><pre>
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Original : This is the Euro symbol '€'.
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TRANSLIT : This is the Euro symbol 'EUR'.
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IGNORE : This is the Euro symbol ''.
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Plain :
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Notice: iconv(): Detected an illegal character in input string in .\iconv-example.php on line 7
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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></div></div></body></html> |