What is the good example of using 'func_get_arg' in PHP?

Question

I just have found out that there is a function called func_get_arg in PHP which enables developer to use variant style of getting arguments. It seems to be very us

Answer 1

Let's say we have multiple arrays containing data in which we need to search across the keys for their values without merging these arrays.

The arrays are like:

$a = array('a' => 5, 'b' => 6);
$b = array('a' => 2, 'b' => 8);
$c = array('a' => 7, 'b' => 3);

In that case, say we need to get all the values of the key a from all the arrays. We can write a function that take in arbitrary number of arrays to search in.

// we need the key, and at least 1 array to search in
function simpleSearchArrays($key, $a1){
    $arrays = func_get_args();
    array_shift($arrays); // remove the first argument, which is the key
    $ret = array();
    foreach($arrays as $a){
        if(array_key_exists($key, $a)){
            $ret[] = $a[$key];
        }
    }
    return $ret;
}

So if we use the function:

 $x = simpleSearchArrays('a', $a, $b, $c);

$x will then contain array(5, 2, 7).