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How do I find if a value is already in an array or not?


This can easily be done with the in_array() function.

It is strange how we tend not to need to use this function the first few times we use PHP, but then when occasions crop up that we need to use this function we find that there are many, many times where we need to know if a value is already in an array or not.

Here is how to use this simple function:

<?php

$values 
= array(1,20,10);

$masterarray range(1,10);//contains 1 - 10

foreach($values as $test) {

if(
in_array($test,$masterarray)) { echo "$test is in the masterarray\n";}

}
//prints:
//1 is in the masterarray
//10 is in the masterarray
?>



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