say I have an array like this:
$test1[0]= "hi599";
$test1[1]= "hi600hi";
$test1[2]= "hey605hi";
$test1[3]= "hi";
$test1[4]= "600";
I need a php function that will return to me the corrisponding keys of all the values of the array that contain "600"
array_search will not work, beacuse it only returns 4, it doesn't see $test1[1] as having 600 in it for some reason