PHP快速将一个多维数组转换成一维数组

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所属分类：PHP

使用标准PHP库（SPL）递归：

$a = <span class="hljs-keyword">array</span>(<span class="hljs-number">1</span>,<span class="hljs-number">2</span>,<span class="hljs-keyword">array</span>(<span class="hljs-number">3</span>,<span class="hljs-number">4</span>, <span class="hljs-keyword">array</span>(<span class="hljs-number">5</span>,<span class="hljs-number">6</span>,<span class="hljs-number">7</span>), <span class="hljs-number">8</span>), <span class="hljs-number">9</span>);
$it = <span class="hljs-keyword">new</span> RecursiveIteratorIterator(<span class="hljs-keyword">new</span> RecursiveArrayIterator($a));
<span class="hljs-keyword">foreach</span>($it <span class="hljs-keyword">as</span> $v) {
  <span class="hljs-keyword">echo</span> $v, <span class="hljs-string">" "</span>;
}

<span class="hljs-comment">//print</span>

<span class="hljs-number">1</span> <span class="hljs-number">2</span> <span class="hljs-number">3</span> <span class="hljs-number">4</span> <span class="hljs-number">5</span> <span class="hljs-number">6</span> <span class="hljs-number">7</span> <span class="hljs-number">8</span> <span class="hljs-number">9</span>

$a = array(1,2,array(3,4, array(5,6,7), 8), 9);

$it = new RecursiveIteratorIterator(new RecursiveArrayIterator($a));

foreach($it as $v) {

echo $v, " ";

}

//print

1 2 3 4 5 6 7 8 9

取得数组某个键值：

$array = [[<span class="hljs-string">'value'</span> => <span class="hljs-number">1</span>], [<span class="hljs-string">'value'</span> => <span class="hljs-number">2</span>], [<span class="hljs-string">'value'</span> => <span class="hljs-number">3</span>]];

implode(<span class="hljs-string">', '</span>, array_map(<span class="hljs-function"><span class="hljs-keyword">function</span><span class="hljs-params">($value)</span> </span>{
    <span class="hljs-keyword">return</span> $value[<span class="hljs-string">'value'</span>];
}, $array));

<span class="hljs-comment">//print </span>

<span class="hljs-number">1</span>, <span class="hljs-number">2</span>, <span class="hljs-number">3</span>