php按照数组的值来进行排序
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<pre><code>$x = array(1,2,3,4,5);
var_dump($x);
//除去下标在为3底下的值
unset($x);
var_dump($x);
//除去下标为3的值后面重新排序
$x = array_values($x);
var_dump($x);</code></pre>
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