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192 lines
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192 lines
11 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>合并一个或多个数组</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.array-merge" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">array_merge</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">array_merge</span> — <span class="dc-title">合并一个或多个数组</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.array-merge-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>array_merge</strong></span>
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( <span class="methodparam"><span class="type">array</span> <code class="parameter">$array1</code></span>
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[, <span class="methodparam"><span class="type">array</span> <code class="parameter">$...</code></span>
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] ) : <span class="type">array</span></div>
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<p class="para rdfs-comment">
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<span class="function"><strong>array_merge()</strong></span> 将一个或多个数组的单元合并起来，一个数组中的值附加在前一个数组的后面。返回作为结果的数组。
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</p>
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<p class="para">
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如果输入的数组中有相同的字符串键名，则该键名后面的值将覆盖前一个值。然而，如果数组包含数字键名，后面的值将<em class="emphasis">不会</em>覆盖原来的值，而是附加到后面。
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</p>
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<p class="para">
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如果只给了一个数组并且该数组是数字索引的，则键名会以连续方式重新索引。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.array-merge-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">array1</code></dt>
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<dd>
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<p class="para">
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要合并的第一个数组。
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</p>
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</dd>
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<dt>
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<code class="parameter">...</code></dt>
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<dd>
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<p class="para">
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要合并的数组列表。
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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.array-merge-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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返回结果数组。
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.array-merge-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-6047">
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<p><strong>Example #1 <span class="function"><strong>array_merge()</strong></span> 例子</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 />$array1 </span><span style="color: #007700">= array(</span><span style="color: #DD0000">"color" </span><span style="color: #007700">=> </span><span style="color: #DD0000">"red"</span><span style="color: #007700">, </span><span style="color: #0000BB">2</span><span style="color: #007700">, </span><span style="color: #0000BB">4</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$array2 </span><span style="color: #007700">= array(</span><span style="color: #DD0000">"a"</span><span style="color: #007700">, </span><span style="color: #DD0000">"b"</span><span style="color: #007700">, </span><span style="color: #DD0000">"color" </span><span style="color: #007700">=> </span><span style="color: #DD0000">"green"</span><span style="color: #007700">, </span><span style="color: #DD0000">"shape" </span><span style="color: #007700">=> </span><span style="color: #DD0000">"trapezoid"</span><span style="color: #007700">, </span><span style="color: #0000BB">4</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$result </span><span style="color: #007700">= </span><span style="color: #0000BB">array_merge</span><span style="color: #007700">(</span><span style="color: #0000BB">$array1</span><span style="color: #007700">, </span><span style="color: #0000BB">$array2</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">print_r</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</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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Array
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(
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[color] => green
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[0] => 2
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[1] => 4
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[2] => a
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[3] => b
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[shape] => trapezoid
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[4] => 4
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)
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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-6048">
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<p><strong>Example #2 Simple <span class="function"><strong>array_merge()</strong></span> 例子</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 />$array1 </span><span style="color: #007700">= array();<br /></span><span style="color: #0000BB">$array2 </span><span style="color: #007700">= array(</span><span style="color: #0000BB">1 </span><span style="color: #007700">=> </span><span style="color: #DD0000">"data"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$result </span><span style="color: #007700">= </span><span style="color: #0000BB">array_merge</span><span style="color: #007700">(</span><span style="color: #0000BB">$array1</span><span style="color: #007700">, </span><span style="color: #0000BB">$array2</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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<div class="example-contents"><p>
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别忘了数字键名将会被重新编号！
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</p></div>
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<div class="example-contents screen">
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<div class="cdata"><pre>
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Array
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(
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[0] => data
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)
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</pre></div>
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</div>
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<div class="example-contents"><p>
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如果你想完全保留原有数组并只想新的数组附加到后面，用 <em>+</em> 运算符：
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</p></div>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br />$array1 </span><span style="color: #007700">= array(</span><span style="color: #0000BB">0 </span><span style="color: #007700">=> </span><span style="color: #DD0000">'zero_a'</span><span style="color: #007700">, </span><span style="color: #0000BB">2 </span><span style="color: #007700">=> </span><span style="color: #DD0000">'two_a'</span><span style="color: #007700">, </span><span style="color: #0000BB">3 </span><span style="color: #007700">=> </span><span style="color: #DD0000">'three_a'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$array2 </span><span style="color: #007700">= array(</span><span style="color: #0000BB">1 </span><span style="color: #007700">=> </span><span style="color: #DD0000">'one_b'</span><span style="color: #007700">, </span><span style="color: #0000BB">3 </span><span style="color: #007700">=> </span><span style="color: #DD0000">'three_b'</span><span style="color: #007700">, </span><span style="color: #0000BB">4 </span><span style="color: #007700">=> </span><span style="color: #DD0000">'four_b'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$result </span><span style="color: #007700">= </span><span style="color: #0000BB">$array1 </span><span style="color: #007700">+ </span><span style="color: #0000BB">$array2</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">var_dump</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</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>
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第一个数组的键名将会被保留。在两个数组中存在相同的键名时，第一个数组中的同键名的元素将会被保留，第二个数组中的元素将会被忽略
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</p></div>
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<div class="example-contents screen">
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<div class="cdata"><pre>
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array(5) {
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[0]=>
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string(6) "zero_a"
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[2]=>
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string(5) "two_a"
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[3]=>
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string(7) "three_a"
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[1]=>
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string(5) "one_b"
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[4]=>
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string(6) "four_b"
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}
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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-6049">
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<p><strong>Example #3 <span class="function"><strong>array_merge()</strong></span> 合并非数组的类型</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 />$beginning </span><span style="color: #007700">= </span><span style="color: #DD0000">'foo'</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$end </span><span style="color: #007700">= array(</span><span style="color: #0000BB">1 </span><span style="color: #007700">=> </span><span style="color: #DD0000">'bar'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$result </span><span style="color: #007700">= </span><span style="color: #0000BB">array_merge</span><span style="color: #007700">((array)</span><span style="color: #0000BB">$beginning</span><span style="color: #007700">, (array)</span><span style="color: #0000BB">$end</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">print_r</span><span style="color: #007700">(</span><span style="color: #0000BB">$result</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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Array
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(
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[0] => foo
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[1] => bar
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)
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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.array-merge-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="array_merge_recursive.html" class="function" rel="rdfs-seeAlso">array_merge_recursive()</a> - 递归地合并一个或多个数组</span></li>
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<li class="member"><span class="function"><a href="array_replace.html" class="function" rel="rdfs-seeAlso">array_replace()</a> - 使用传递的数组替换第一个数组的元素</span></li>
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<li class="member"><span class="function"><a href="array_combine.html" class="function" rel="rdfs-seeAlso">array_combine()</a> - 创建一个数组，用一个数组的值作为其键名，另一个数组的值作为其值</span></li>
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<li class="member"><a href="language.operators.array.html" class="link">array operators</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> |