php-检查数组中是否存在某个值

大家猜猜结果是啥？

$arr = array('a'=>'a', 'b' => 0); 
var_dump(in_array('abc',$arr));

换个方式？看看是啥？

$arr = array('a'=>'a', 'b' => 0); 
var_dump(in_array('abc',$arr,true));

大家试试就明白了！

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