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156 lines
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HTML
156 lines
6.6 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>Find position (in grapheme units) of first occurrence of a string</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.grapheme-strpos" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">grapheme_strpos</h1>
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<p class="verinfo">(PHP 5 >= 5.3.0, PHP 7, PECL intl >= 1.0.0)</p><p class="refpurpose"><span class="refname">grapheme_strpos</span> — <span class="dc-title">Find position (in grapheme units) of first occurrence of a string</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.grapheme-strpos-description">
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<h3 class="title">说明</h3>
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<p class="para">过程化风格</p>
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<div class="methodsynopsis dc-description">
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<span class="methodname"><strong>grapheme_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="type">int</span></div>
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<p class="para rdfs-comment">
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Find position (in grapheme units) of first occurrence of a string
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.grapheme-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 string to look in. Must be valid UTF-8.
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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 string to look for. Must be valid UTF-8.
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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 $offset parameter allows you to specify where in $haystack to
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start searching as an offset in grapheme units (not bytes or characters).
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If the offset is negative, it is treated relative to the end of the string.
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The position returned is still relative to the beginning of haystack
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regardless of the value of $offset.
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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.grapheme-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 position as an integer. If needle is not found, grapheme_strpos() will return boolean FALSE.
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</p>
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</div>
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<div class="refsect1 changelog" id="refsect1-function.grapheme-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 examples" id="refsect1-function.grapheme-strpos-examples">
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<h3 class="title">范例</h3>
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<div class="example" id="example-3097">
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<p><strong>Example #1 <span class="function"><strong>grapheme_strpos()</strong></span> example</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 /><br />$char_a_ring_nfd </span><span style="color: #007700">= </span><span style="color: #DD0000">"a\xCC\x8A"</span><span style="color: #007700">; </span><span style="color: #FF8000">// 'LATIN SMALL LETTER A WITH RING ABOVE' (U+00E5) normalization form "D"<br /></span><span style="color: #0000BB">$char_o_diaeresis_nfd </span><span style="color: #007700">= </span><span style="color: #DD0000">"o\xCC\x88"</span><span style="color: #007700">; </span><span style="color: #FF8000">// 'LATIN SMALL LETTER O WITH DIAERESIS' (U+00F6) normalization form "D"<br /><br /></span><span style="color: #007700">print </span><span style="color: #0000BB">grapheme_strpos</span><span style="color: #007700">( </span><span style="color: #0000BB">$char_a_ring_nfd </span><span style="color: #007700">. </span><span style="color: #0000BB">$char_a_ring_nfd </span><span style="color: #007700">. </span><span style="color: #0000BB">$char_o_diaeresis_nfd</span><span style="color: #007700">, </span><span style="color: #0000BB">$char_o_diaeresis_nfd</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>
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<p class="para">以上例程会输出：</p>
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<div class="example-contents screen">
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<div class="cdata"><pre>
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2
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</pre></div>
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</div>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.grapheme-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="grapheme_stripos.html" class="function" rel="rdfs-seeAlso">grapheme_stripos()</a> - Find position (in grapheme units) of first occurrence of a case-insensitive string</span></li>
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<li class="member"><span class="function"><a href="grapheme_stristr.html" class="function" rel="rdfs-seeAlso">grapheme_stristr()</a> - Returns part of haystack string from the first occurrence of case-insensitive needle to the end of haystack</span></li>
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<li class="member"><span class="function"><a href="grapheme_strripos.html" class="function" rel="rdfs-seeAlso">grapheme_strripos()</a> - Find position (in grapheme units) of last occurrence of a case-insensitive string</span></li>
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<li class="member"><span class="function"><a href="grapheme_strrpos.html" class="function" rel="rdfs-seeAlso">grapheme_strrpos()</a> - Find position (in grapheme units) of last occurrence of a string</span></li>
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<li class="member"><span class="function"><a href="grapheme_strstr.html" class="function" rel="rdfs-seeAlso">grapheme_strstr()</a> - Returns part of haystack string from the first occurrence of needle to the end of haystack</span></li>
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<li class="member">
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<a href="http://unicode.org/reports/tr29/#Grapheme_Cluster_Boundaries" class="link external">»
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Unicode Text Segmentation: Grapheme Cluster Boundaries
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</a>
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</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> |