How to find if the value is inside array?

[seahorse123]

In php file I have a value for example $a=40, and an array $a[]=[10,20,30,40]
is there a function to find if this variable is one of the element of the array? thanks.

 

[sleipnir214]

http://us2.php.net/manual/en/function.in-array.php

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[seahorse123]

thanks.