Codesample for explain pre and post increments

pp_increment.php

<?php

function pre( &$y ) {
    $y = $y + 1;
    return $y;
}

function post( &$y ) {
    $old = $y;
    $y = $y + 1;
    return $old;
}

$x=1; printf(
    "Pre:\n\tKirish: %d\n\tChiqish: %d\n",
    pre( $x ),
    $x
);

$x=1; printf(
    "Post:\n\tKirish: %d\n\tChiqish: %d\n",
    post( $x ),
    $x
);

/*
Pre:
    Kirish: 2
    Chiqish: 2
Post:
    Kirish: 1
    Chiqish: 2
*/