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164 lines
6.5 KiB
HTML
164 lines
6.5 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>Return part 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-substr" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">grapheme_substr</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_substr</span> — <span class="dc-title">Return part of a string</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.grapheme-substr-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_substr</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$string</code></span>
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, <span class="methodparam"><span class="type">int</span> <code class="parameter">$start</code></span>
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[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$length</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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Return part 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-substr-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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The input string. 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">start</code></dt>
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<dd>
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<p class="para">
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Start position in default grapheme units.
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If $start is non-negative, the returned string will start at the
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$start'th position in $string, counting from zero. If $start is negative,
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the returned string will start at the $start'th grapheme unit from the
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end of string.
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</p>
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</dd>
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<dt>
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<code class="parameter">length</code></dt>
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<dd>
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<p class="para">
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Length in grapheme units.
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If $length is given and is positive, the string returned will contain
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at most $length grapheme units beginning from $start (depending on the
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length of string). If $length is given and is negative, then
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that many grapheme units will be omitted from the end of string (after the
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start position has been calculated when a start is negative). If $start
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denotes a position beyond this truncation, <strong><code>FALSE</code></strong> will be returned.
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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-substr-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 extracted part of $string.
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</p>
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</div>
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<div class="refsect1 changelog" id="refsect1-function.grapheme-substr-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</td>
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<td>
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If <code class="parameter">length</code> is given and positive and the
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argument string is shorter than the specified length, all the rest of
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the string according to <code class="parameter">start</code> parameter is
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returned. Previously, <strong><code>FALSE</code></strong> was returned.
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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.grapheme-substr-examples">
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<h3 class="title">范例</h3>
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<div class="example" id="example-3101">
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<p><strong>Example #1 <span class="function"><strong>grapheme_substr()</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">$char_o_diaeresis_nfd </span><span style="color: #007700">= </span><span style="color: #DD0000">"o\xCC\x88"</span><span style="color: #007700">; </span><span style="color: #FF8000">// 'LATIN SMALL LETTER O WITH DIAERESIS' (U+00F6) normalization form "D"<br /><br /></span><span style="color: #007700">print </span><span style="color: #0000BB">urlencode</span><span style="color: #007700">(</span><span style="color: #0000BB">grapheme_substr</span><span style="color: #007700">( </span><span style="color: #DD0000">"ao" </span><span style="color: #007700">. </span><span style="color: #0000BB">$char_a_ring_nfd </span><span style="color: #007700">. </span><span style="color: #DD0000">"bc" </span><span style="color: #007700">. </span><span style="color: #0000BB">$char_o_diaeresis_nfd </span><span style="color: #007700">. </span><span style="color: #DD0000">"O"</span><span style="color: #007700">, </span><span style="color: #0000BB">2</span><span style="color: #007700">, -</span><span style="color: #0000BB">1 </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 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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a%CC%8Abco%CC%88
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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-substr-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_extract.html" class="function" rel="rdfs-seeAlso">grapheme_extract()</a> - Function to extract a sequence of default grapheme clusters from a text buffer, which must be encoded in UTF-8</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> |