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149 lines
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HTML
149 lines
7.8 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>Perform a regular expression search and replace using callbacks</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.preg-replace-callback-array" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">preg_replace_callback_array</h1>
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<p class="verinfo">(PHP 7)</p><p class="refpurpose"><span class="refname">preg_replace_callback_array</span> — <span class="dc-title">Perform a regular expression search and replace using callbacks</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.preg-replace-callback-array-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>preg_replace_callback_array</strong></span>
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( <span class="methodparam"><span class="type">array</span> <code class="parameter">$patterns_and_callbacks</code></span>
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, <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <code class="parameter">$subject</code></span>
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[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$limit</code><span class="initializer"> = -1</span></span>
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[, <span class="methodparam"><span class="type">int</span> <code class="parameter reference">&$count</code></span>
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]] ) : <span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span></div>
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<p class="para rdfs-comment">
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The behavior of this function is similar to
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<span class="function"><a href="preg_replace_callback.html" class="function">preg_replace_callback()</a></span>, except that callbacks are
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executed on a per-pattern basis.
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.preg-replace-callback-array-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">patterns_and_callbacks</code></dt>
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<dd>
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<p class="para">
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An associative array mapping patterns (keys) to callbacks (values).
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</p>
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</dd>
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<dt>
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<code class="parameter">subject</code></dt>
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<dd>
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<p class="para">
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The string or an array with strings to search and replace.
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</p>
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</dd>
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<dt>
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<code class="parameter">limit</code></dt>
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<dd>
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<p class="para">
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The maximum possible replacements for each pattern in each
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<code class="parameter">subject</code> string. Defaults to
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<em>-1</em> (no limit).
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</p>
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</dd>
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<dt>
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<code class="parameter">count</code></dt>
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<dd>
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<p class="para">
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If specified, this variable will be filled with the number of
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replacements done.
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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.preg-replace-callback-array-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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<span class="function"><strong>preg_replace_callback_array()</strong></span> returns an array if the
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<code class="parameter">subject</code> parameter is an array, or a string
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otherwise. On errors the return value is <strong><code>NULL</code></strong>
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</p>
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<p class="para">
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If matches are found, the new subject will be returned, otherwise
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<code class="parameter">subject</code> will be returned unchanged.
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.preg-replace-callback-array-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-5868">
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<p><strong>Example #1 <span class="function"><strong>preg_replace_callback_array()</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 />$subject </span><span style="color: #007700">= </span><span style="color: #DD0000">'Aaaaaa Bbb'</span><span style="color: #007700">;<br /><br /></span><span style="color: #0000BB">preg_replace_callback_array</span><span style="color: #007700">(<br /> [<br /> </span><span style="color: #DD0000">'~[a]+~i' </span><span style="color: #007700">=> function (</span><span style="color: #0000BB">$match</span><span style="color: #007700">) {<br /> echo </span><span style="color: #0000BB">strlen</span><span style="color: #007700">(</span><span style="color: #0000BB">$match</span><span style="color: #007700">[</span><span style="color: #0000BB">0</span><span style="color: #007700">]), </span><span style="color: #DD0000">' matches for "a" found'</span><span style="color: #007700">, </span><span style="color: #0000BB">PHP_EOL</span><span style="color: #007700">;<br /> },<br /> </span><span style="color: #DD0000">'~[b]+~i' </span><span style="color: #007700">=> function (</span><span style="color: #0000BB">$match</span><span style="color: #007700">) {<br /> echo </span><span style="color: #0000BB">strlen</span><span style="color: #007700">(</span><span style="color: #0000BB">$match</span><span style="color: #007700">[</span><span style="color: #0000BB">0</span><span style="color: #007700">]), </span><span style="color: #DD0000">' matches for "b" found'</span><span style="color: #007700">, </span><span style="color: #0000BB">PHP_EOL</span><span style="color: #007700">;<br /> }<br /> ],<br /> </span><span style="color: #0000BB">$subject<br /></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 class="example-contents"><p>以上例程会输出：</p></div>
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<div class="example-contents screen">
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<div class="cdata"><pre>
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6 matches for "a" found
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3 matches for "b" found
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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.preg-replace-callback-array-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"><a href="pcre.pattern.html" class="link">PCRE Patterns</a></li>
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<li class="member"><span class="function"><a href="preg_replace_callback.html" class="function" rel="rdfs-seeAlso">preg_replace_callback()</a> - 执行一个正则表达式搜索并且使用一个回调进行替换</span></li>
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<li class="member"><span class="function"><a href="preg_quote.html" class="function" rel="rdfs-seeAlso">preg_quote()</a> - 转义正则表达式字符</span></li>
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<li class="member"><span class="function"><a href="preg_replace.html" class="function" rel="rdfs-seeAlso">preg_replace()</a> - 执行一个正则表达式的搜索和替换</span></li>
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<li class="member"><span class="function"><a href="preg_last_error.html" class="function" rel="rdfs-seeAlso">preg_last_error()</a> - 返回最后一个PCRE正则执行产生的错误代码</span></li>
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<li class="member"><a href="functions.anonymous.html" class="link">Anonymous functions</a></li>
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<li class="member"><a href="language.pseudo-types.html#language.types.callback" class="link">callback</a> 类型的信息</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> |