I would like to apply a function to every PHP POST or GET variable:
$_GET["some_variable"] -> some_function($_GET["some_variable"])
$_POST["some_variable"] -> some_function($_POST["some_variable"])
Any suggestion for the regex expression to match and replace those occurrences in my files?
You can use array_map function to call a function on each element of an array:
$modifiedGet = array_map(some_function, $_GET);
$modifiedPost = array_map(some_function, $_POST);
This is a bad idea. Consider some code like
<?php
$_POST['override'] = 'some override value';
Unless you want to teach your replacement function PHP syntax rules, you'll end up with
<?php
some_function($_POST['override']) = 'some override value';
which is a syntax error: Can't use function return value in write context.
If you're going to downvote say why in the comment so I can fix a mistake if there is one. To my knowledge, this is a better method to call than the accepted answer since it is recursive and will work on sub-arrays. If it's not, I'd like to know why.
You can use array_walk_recursive to call a function for each value in an array:
function walk_function(&$value) {
$value = some_function($value);
}
array_walk_recursive($_GET, 'walk_function');
array_walk_recursive($_POST, 'walk_function');
http://php.net/manual/en/function.array-walk-recursive.php
This has an advantage over array_map in that it is recursive and will call the function for arrays within the array. For example, if you submit checkboxes or multi-select there will be sub-arrays that may need the same processing done on them.
some_function.some_function, does that suffice?some_function is. some_function is only know by the OP, you can't assume what it is, and you need to build an answer with this fact.some_function is, and you don't know what it does and what are the types of the array items (are they numbers, strings, arrays, objects? If they are arrays, must be each levels changed or not). To be short, you can't assume that a possible multidimensionnal array must be changed for all its levels.
E_BAAAAD.