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<!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>替换字符串的子串</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.substr-replace" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">substr_replace</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">substr_replace</span> — <span class="dc-title">替换字符串的子串</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.substr-replace-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>substr_replace</strong></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">$string</code></span>
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, <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <code class="parameter">$replacement</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">$start</code></span>
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[, <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <code class="parameter">$length</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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<span class="function"><strong>substr_replace()</strong></span> 在字符串 <code class="parameter">string</code> 的副本中将由 <code class="parameter">start</code> 和可选的 <code class="parameter">length</code> 参数限定的子字符串使用 <code class="parameter">replacement</code> 进行替换。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.substr-replace-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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输入字符串。
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</p>
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<p class="para">
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An <span class="type"><a href="language.types.array.html" class="type array">array</a></span> of <span class="type"><a href="language.types.string.html" class="type string">string</a></span>s can be provided, in which
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case the replacements will occur on each string in turn. In this case,
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the <code class="parameter">replacement</code>, <code class="parameter">start</code>
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and <code class="parameter">length</code> parameters may be provided either as
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scalar values to be applied to each input string in turn, or as
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<span class="type"><a href="language.types.array.html" class="type array">array</a></span>s, in which case the corresponding array element will
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be used for each input string.
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</p>
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</dd>
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<dt>
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<code class="parameter">replacement</code></dt>
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<dd>
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<p class="para">
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替换字符串。
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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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如果 <code class="parameter">start</code> 为正数，替换将从 <code class="parameter">string</code> 的 <code class="parameter">start</code> 位置开始。
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</p>
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<p class="para">
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如果 <code class="parameter">start</code> 为负数，替换将从 <code class="parameter">string</code> 的倒数第 <code class="parameter">start</code> 个位置开始。
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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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如果设定了这个参数并且为正数，表示 <code class="parameter">string</code> 中被替换的子字符串的长度。如果设定为负数，它表示待替换的子字符串结尾处距离 <code class="parameter">string</code> 末端的字符个数。如果没有提供此参数，那么它默认为 strlen( <code class="parameter">string</code> ) （字符串的长度）。当然，如果 <code class="parameter">length</code> 为 0，那么这个函数的功能为将 <code class="parameter">replacement</code> 插入到 <code class="parameter">string</code> 的 <code class="parameter">start</code> 位置处。
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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.substr-replace-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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返回结果字符串。如果 <code class="parameter">string</code> 是个数组，那么也将返回一个数组。
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</p>
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</div>
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<div class="refsect1 changelog" id="refsect1-function.substr-replace-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>4.3.3</td>
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<td>
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All parameters now accept <span class="type"><a href="language.types.array.html" class="type array">array</a></span>s.
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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.substr-replace-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-5993">
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<p><strong>Example #1 <span class="function"><strong>substr_replace()</strong></span> 范例</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 />$var </span><span style="color: #007700">= </span><span style="color: #DD0000">'ABCDEFGH:/MNRPQR/'</span><span style="color: #007700">;<br />echo </span><span style="color: #DD0000">"Original: </span><span style="color: #0000BB">$var</span><span style="color: #DD0000"><hr />\n"</span><span style="color: #007700">;<br /><br /></span><span style="color: #FF8000">/* 这两个例子使用 “bob” 替换整个 $var。*/<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">substr_replace</span><span style="color: #007700">(</span><span style="color: #0000BB">$var</span><span style="color: #007700">, </span><span style="color: #DD0000">'bob'</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">) . </span><span style="color: #DD0000">"<br />\n"</span><span style="color: #007700">;<br />echo </span><span style="color: #0000BB">substr_replace</span><span style="color: #007700">(</span><span style="color: #0000BB">$var</span><span style="color: #007700">, </span><span style="color: #DD0000">'bob'</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">strlen</span><span style="color: #007700">(</span><span style="color: #0000BB">$var</span><span style="color: #007700">)) . </span><span style="color: #DD0000">"<br />\n"</span><span style="color: #007700">;<br /><br /></span><span style="color: #FF8000">/* 将 “bob” 插入到 $var 的开头处。*/<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">substr_replace</span><span style="color: #007700">(</span><span style="color: #0000BB">$var</span><span style="color: #007700">, </span><span style="color: #DD0000">'bob'</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">) . </span><span style="color: #DD0000">"<br />\n"</span><span style="color: #007700">;<br /><br /></span><span style="color: #FF8000">/* 下面两个例子使用 “bob” 替换 $var 中的 “MNRPQR”。*/<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">substr_replace</span><span style="color: #007700">(</span><span style="color: #0000BB">$var</span><span style="color: #007700">, </span><span style="color: #DD0000">'bob'</span><span style="color: #007700">, </span><span style="color: #0000BB">10</span><span style="color: #007700">, -</span><span style="color: #0000BB">1</span><span style="color: #007700">) . </span><span style="color: #DD0000">"<br />\n"</span><span style="color: #007700">;<br />echo </span><span style="color: #0000BB">substr_replace</span><span style="color: #007700">(</span><span style="color: #0000BB">$var</span><span style="color: #007700">, </span><span style="color: #DD0000">'bob'</span><span style="color: #007700">, -</span><span style="color: #0000BB">7</span><span style="color: #007700">, -</span><span style="color: #0000BB">1</span><span style="color: #007700">) . </span><span style="color: #DD0000">"<br />\n"</span><span style="color: #007700">;<br /><br /></span><span style="color: #FF8000">/* 从 $var 中删除 “MNRPQR”。*/<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">substr_replace</span><span style="color: #007700">(</span><span style="color: #0000BB">$var</span><span style="color: #007700">, </span><span style="color: #DD0000">''</span><span style="color: #007700">, </span><span style="color: #0000BB">10</span><span style="color: #007700">, -</span><span style="color: #0000BB">1</span><span style="color: #007700">) . </span><span style="color: #DD0000">"<br />\n"</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>
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<p class="para">
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<div class="example" id="example-5994">
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<p><strong>Example #2
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Using <span class="function"><strong>substr_replace()</strong></span> to replace multiple strings at
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once
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</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 />$input </span><span style="color: #007700">= array(</span><span style="color: #DD0000">'A: XXX'</span><span style="color: #007700">, </span><span style="color: #DD0000">'B: XXX'</span><span style="color: #007700">, </span><span style="color: #DD0000">'C: XXX'</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// A simple case: replace XXX in each string with YYY.<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">implode</span><span style="color: #007700">(</span><span style="color: #DD0000">'; '</span><span style="color: #007700">, </span><span style="color: #0000BB">substr_replace</span><span style="color: #007700">(</span><span style="color: #0000BB">$input</span><span style="color: #007700">, </span><span style="color: #DD0000">'YYY'</span><span style="color: #007700">, </span><span style="color: #0000BB">3</span><span style="color: #007700">, </span><span style="color: #0000BB">3</span><span style="color: #007700">)).</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br /><br /></span><span style="color: #FF8000">// A more complicated case where each replacement is different.<br /></span><span style="color: #0000BB">$replace </span><span style="color: #007700">= array(</span><span style="color: #DD0000">'AAA'</span><span style="color: #007700">, </span><span style="color: #DD0000">'BBB'</span><span style="color: #007700">, </span><span style="color: #DD0000">'CCC'</span><span style="color: #007700">);<br />echo </span><span style="color: #0000BB">implode</span><span style="color: #007700">(</span><span style="color: #DD0000">'; '</span><span style="color: #007700">, </span><span style="color: #0000BB">substr_replace</span><span style="color: #007700">(</span><span style="color: #0000BB">$input</span><span style="color: #007700">, </span><span style="color: #0000BB">$replace</span><span style="color: #007700">, </span><span style="color: #0000BB">3</span><span style="color: #007700">, </span><span style="color: #0000BB">3</span><span style="color: #007700">)).</span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br /><br /></span><span style="color: #FF8000">// Replace a different number of characters each time.<br /></span><span style="color: #0000BB">$length </span><span style="color: #007700">= array(</span><span style="color: #0000BB">1</span><span style="color: #007700">, </span><span style="color: #0000BB">2</span><span style="color: #007700">, </span><span style="color: #0000BB">3</span><span style="color: #007700">);<br />echo </span><span style="color: #0000BB">implode</span><span style="color: #007700">(</span><span style="color: #DD0000">'; '</span><span style="color: #007700">, </span><span style="color: #0000BB">substr_replace</span><span style="color: #007700">(</span><span style="color: #0000BB">$input</span><span style="color: #007700">, </span><span style="color: #0000BB">$replace</span><span style="color: #007700">, </span><span style="color: #0000BB">3</span><span style="color: #007700">, </span><span style="color: #0000BB">$length</span><span style="color: #007700">)).</span><span style="color: #DD0000">"\n"</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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A: YYY; B: YYY; C: YYY
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A: AAA; B: BBB; C: CCC
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A: AAAXX; B: BBBX; C: CCC
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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 notes" id="refsect1-function.substr-replace-notes">
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<h3 class="title">注释</h3>
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<blockquote class="note"><p><strong class="note">Note</strong>: <span class="simpara">此函数可安全用于二进制对象。</span></p></blockquote>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.substr-replace-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="str_replace.html" class="function" rel="rdfs-seeAlso">str_replace()</a> - 子字符串替换</span></li>
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<li class="member"><span class="function"><a href="substr.html" class="function" rel="rdfs-seeAlso">substr()</a> - 返回字符串的子串</span></li>
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<li class="member"><a href="language.types.string.html#language.types.string.substr" class="link">字符串访问与修改</a></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> |