As you know, we usually declare functions in PHP like this -

function foo($arg1, $arg2) { 

// code

}

This leads to PHP-error when one of the argument is missing. To deal with this, we have an alternate method. We shall NOT declare ANY arguments in the prototype. Then we'll use func_get_args() to get all the arguments passed to function in an array. Further we can manipulate the array as we want.

function foo() {

$args = func_get_args();

}

When you will call foo(1,2,3) then $args[0] = 1 ; $args[1] = 2 and so on.

This way you can prevent PHP-Errors and have custom errors.

To handler PHP-Errors I suppose there does exist an function to set a custom handler for PHP-Errors. This is just an alternate method ;)