in_array Of the 3 Parameter example analysis

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Use in_array () Determine whether there is a value in the array , If paragraph is omitted 3 Parameters , Sometimes the results may be meaningless ...

For example, the following code ：

<?php$arr = [true, false];$f = in_array('Hello', $arr);if($f)  echo 'in array';else  echo 'not found';// Results output  in array

Change to in_array('Hello', $arr, true) To solve this problem

stay JS There is no such problem in , For example indexOf () Function rewrite is like this

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