Checks value IF is a valid date

is_date.php

function is_date($date){
    // date example mm-dd-year -> 09-25-2012
    $datechunks = explode("-",$date);
    if(sizeof($datechunks)==3){
        if(is_numeric($datechunks[0]) && is_numeric($datechunks[1]) && is_numeric($datechunks[2]))
        {
            // now check if its a valid date
            if(checkdate($datechunks[0], $datechunks[1], $datechunks[2])){
            return true;
            }else{
            return false;
            }

        }else{
        return false;
        }
    }

}

Ah k, fair enough :).

The return statement automatically exits the function once reached. My reordering of the return statements simply saves if/else lines.

For example:

if ($x == 1) {
    return false;
} else {
    return true;
}

Is the same as:

if ($x != 1)
    return true;
return false;

Because the first return statement has been reached, there's no need to go any further in the function, so PHP will ignore everything below "return true;" (should $x not equal 1, that is.) Otherwise, if $x is 1, it will return false because the "return true;" statement is skipped.