gistfile1.txt

Approach 1

<?php
class A
{
    
    function __construct()
    {
        $a = func_get_args();
        $i = func_num_args();
        if (method_exists($this, $f = '__construct' . $i)) {
            call_user_func_array(array($this, $f), $a);
        }
    }

    function __construct1($a1)
    {
        echo('__construct with 1 param called: ' . $a1);
    }

    function __construct2($a1, $a2)
    {
        echo('__construct with 2 params called: ' . $a1 . ',' . $a2);
    }

    function __construct3($a1, $a2, $a3)
    {
        echo('__construct with 3 params called: ' . $a1 . ',' . $a2 . ',' . $a3);
    }
    
}

$o = new A('sheep'); echo "<br />";
$o = new A('sheep','cat'); echo "<br />";
$o = new A('sheep','cat','dog');

// results:
// __construct with 1 param called: sheep
// __construct with 2 params called: sheep,cat
// __construct with 3 params called: sheep,cat,dog

?>

https://stackoverflow.com/questions/2169448/why-cant-i-overload-constructors-in-php/51908855#51908855