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163 lines
5.6 KiB
HTML
163 lines
5.6 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>Finds position of first occurrence of a needle within a haystack</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-strpos" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">iconv_strpos</h1>
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<p class="verinfo">(PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">iconv_strpos</span> — <span class="dc-title">Finds position of first occurrence of a needle within a haystack</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.iconv-strpos-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_strpos</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$haystack</code></span>
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, <span class="methodparam"><span class="type">string</span> <code class="parameter">$needle</code></span>
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[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$offset</code><span class="initializer"> = 0</span></span>
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[, <span class="methodparam"><span class="type">string</span> <code class="parameter">$charset</code><span class="initializer"> = ini_get("iconv.internal_encoding")</span></span>
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]] ) : <span class="type">int</span></div>
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<p class="para rdfs-comment">
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Finds position of first occurrence of a <code class="parameter">needle</code>
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within a <code class="parameter">haystack</code>.
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</p>
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<p class="para">
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In contrast to <span class="function"><a href="strpos.html" class="function">strpos()</a></span>, the return value of
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<span class="function"><strong>iconv_strpos()</strong></span> is the number of characters that
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appear before the needle, rather than the offset in bytes to the
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position where the needle has been found. The characters are counted
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on the basis of the specified character set <code class="parameter">charset</code>.
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.iconv-strpos-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">haystack</code></dt>
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<dd>
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<p class="para">
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The entire string.
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</p>
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</dd>
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<dt>
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<code class="parameter">needle</code></dt>
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<dd>
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<p class="para">
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The searched substring.
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</p>
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</dd>
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<dt>
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<code class="parameter">offset</code></dt>
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<dd>
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<p class="para">
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The optional <code class="parameter">offset</code> parameter specifies
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the position from which the search should be performed.
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If the offset is negative, it is counted from the end of the string.
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</p>
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</dd>
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<dt>
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<code class="parameter">charset</code></dt>
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<dd>
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<p class="para">
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If <code class="parameter">charset</code> parameter is omitted,
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<code class="parameter">string</code> are assumed to be encoded in
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<a href="iconv.configuration.html" class="link">iconv.internal_encoding</a>.
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</p>
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</dd>
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</dl>
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</p>
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<p class="para">
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If <code class="parameter">haystack</code> or <code class="parameter">needle</code> is
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not a string, it is converted to a string and applied as the ordinal
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value of a character.
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</p>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.iconv-strpos-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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Returns the numeric position of the first occurrence of
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<code class="parameter">needle</code> in <code class="parameter">haystack</code>.
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</p>
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<p class="para">
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If <code class="parameter">needle</code> is not found,
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<span class="function"><strong>iconv_strpos()</strong></span> will return <strong><code>FALSE</code></strong>.
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</p>
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<div class="warning"><strong class="warning">Warning</strong><p class="simpara">此函数可能返回布尔值
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<strong><code>FALSE</code></strong>，但也可能返回等同于 <strong><code>FALSE</code></strong> 的非布尔值。请阅读 <a href="language.types.boolean.html" class="link">布尔类型</a>章节以获取更多信息。应使用
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<a href="language.operators.comparison.html" class="link">===
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运算符</a>来测试此函数的返回值。</p></div>
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</div>
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<div class="refsect1 changelog" id="refsect1-function.iconv-strpos-changelog">
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<h3 class="title">更新日志</h3>
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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>7.1.0</td>
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<td>
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Support for negative <code class="parameter">offset</code>s has been added.
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</td>
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</tr>
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</tbody>
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</table>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.iconv-strpos-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="strpos.html" class="function" rel="rdfs-seeAlso">strpos()</a> - 查找字符串首次出现的位置</span></li>
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<li class="member"><span class="function"><a href="iconv_strrpos.html" class="function" rel="rdfs-seeAlso">iconv_strrpos()</a> - Finds the last occurrence of a needle within a haystack</span></li>
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<li class="member"><span class="function"><a href="mb_strpos.html" class="function" rel="rdfs-seeAlso">mb_strpos()</a> - 查找字符串在另一个字符串中首次出现的位置</span></li>
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</ul>
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</p>
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</div>
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</div></div></div></body></html> |