Considerations for using PHP In_array functions

PHP is a weakly typed language when using the In_array function as much as possible with the third parameter, the code is as follows:

Var_dump (In_array (0,array (' s ', ' SSS '), true)); return False

Var_dump (In_array (0,array (' s ', ' SSS ')); return True

Var_dump (In_array (0,array)); return False

From the above three functions can be seen when, the first: In_array (0,array (' s ', ' SSS '), true), return is the value we want.

Used: Var_dump (In_array (0,array (' s ', ' SSS ')); with: Var_dump (In_array (0,array ()));

Return ture is obviously not the value we want, because the main PHP is weak type so before you pay attention to some of the better.

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