php commonly used functions

Others 2020-03-25 17:10:10 views: null

Variables commonly used functions

 /*is_array();
 is_null();
 unset();
 isset();
 empty(); */

$a = '12';
unset($a); //销毁一个变量
var_dump(isset($a)); //检测变量是否存在

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Origin www.cnblogs.com/qq769080870/p/12567203.html

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