/34462068/compare-two-arrays-and-extract-difference

<?php // http://stackoverflow.com/questions/34462068/how-to-compare-two-associative-arrays-and-remove-the-matching-elements-from-one

// include __DIR__ . '/__bootstrap__.php';
/*
 * Convert Print_R back into an array...
 *
 * http://phillihp.com/toolz/php-array-beautifier/
 */

$sA = 'a:5:{i:0;a:10:{s:7:"user_id";s:3:"109";s:15:"profile_page_id";s:1:"0";s:9:"user_name";s:11:"profile-109";s:9:"full_name";s:11:"Hiten Patel";s:6:"gender";s:1:"0";s:10:"user_image";s:4:"\"\"";s:12:"is_invisible";s:1:"0";s:13:"user_group_id";s:1:"6";s:11:"language_id";s:1:"0";s:13:"profile_image";s:92:"http://app.campusknot.com/theme/frontend/foxplus/style/default/image/noimage/profile_100.png";}i:1;a:10:{s:7:"user_id";s:4:"1585";s:15:"profile_page_id";s:1:"0";s:9:"user_name";s:12:"profile-1585";s:9:"full_name";s:12:"Sushil Kadam";s:6:"gender";s:1:"0";s:10:"user_image";s:10:"1585%s.jpg";s:12:"is_invisible";s:1:"0";s:13:"user_group_id";s:1:"7";s:11:"language_id";s:1:"0";s:13:"profile_image";s:59:"http://app.campusknot.com/file/pic/user/1585_100_square.jpg";}i:2;a:10:{s:7:"user_id";s:3:"185";s:15:"profile_page_id";s:1:"0";s:9:"user_name";s:11:"profile-185";s:9:"full_name";s:12:"Perceus Mody";s:6:"gender";s:1:"1";s:10:"user_image";s:9:"185%s.peg";s:12:"is_invisible";s:1:"0";s:13:"user_group_id";s:1:"6";s:11:"language_id";s:1:"0";s:13:"profile_image";s:58:"http://app.campusknot.com/file/pic/user/185_100_square.peg";}i:3;a:10:{s:7:"user_id";s:3:"196";s:15:"profile_page_id";s:1:"0";s:9:"user_name";s:11:"profile-196";s:9:"full_name";s:11:"Ira Hampton";s:6:"gender";s:1:"1";s:10:"user_image";s:46:"2014/11/24c4a6835e667b67b82cea3666841ac7%s.jpg";s:12:"is_invisible";s:1:"0";s:13:"user_group_id";s:1:"6";s:11:"language_id";s:1:"0";s:13:"profile_image";s:88:"http://app.campusknot.com/theme/frontend/foxplus/style/default/image/noimage/profile.png";}i:4;a:10:{s:7:"user_id";s:3:"244";s:15:"profile_page_id";s:1:"0";s:9:"user_name";s:11:"profile-244";s:9:"full_name";s:11:"Hiten Patel";s:6:"gender";s:1:"2";s:10:"user_image";s:9:"244%s.cza";s:12:"is_invisible";s:1:"0";s:13:"user_group_id";s:1:"7";s:11:"language_id";s:1:"0";s:13:"profile_image";s:58:"http://app.campusknot.com/file/pic/user/244_100_square.cza";}}';
$userListA = unserialize($sA);
// \Kint::dump($sA, $userListA);

$sB = 'a:2:{i:0;a:10:{s:7:"user_id";s:3:"244";s:15:"profile_page_id";s:1:"0";s:14:"user_server_id";s:1:"0";s:9:"user_name";s:11:"profile-244";s:9:"full_name";s:11:"Hiten Patel";s:6:"gender";s:1:"2";s:10:"user_image";s:9:"244%s.cza";s:12:"is_invisible";s:1:"0";s:13:"user_group_id";s:1:"7";s:11:"language_id";s:1:"0";}i:1;a:10:{s:7:"user_id";s:4:"1585";s:15:"profile_page_id";s:1:"0";s:14:"user_server_id";s:1:"0";s:9:"user_name";s:12:"profile-1585";s:9:"full_name";s:12:"Sushil Kadam";s:6:"gender";s:1:"0";s:10:"user_image";s:10:"1585%s.jpg";s:12:"is_invisible";s:1:"0";s:13:"user_group_id";s:1:"7";s:11:"language_id";s:1:"0";}}';
$userListB = unserialize($sB);
// \Kint::dump($sB, $userListB);

/*
 * This version is simple but will be slow for large arrays...
 *
 * Hmm... I may want to do a more efficient version later,  so I will use a
 *        compare function now, so that I can easily change it later.
 */

/*
 * Out Array:
 *    1) In $userListA but not in $userListB
 */
$diffAfromB = array();

// check the input user list...
foreach ($userListA as $userA) {

    // find the userA details in Array B
    if (!matchUserAinB($userA, $userListB)) {
        $diffAfromB[] = $userA;
    }
}

// show otput...
var_dump($diffAfromB);

exit;

// -------------------------------------------------------------------------
/**
 * Check if userA exists in userListB
 *
 * @param array $userA
 * @param array $userListB
 * @return boolean
 */
function matchUserAinB($userA, array $userListB)
{
    $found = false;

    foreach ($userListB as $userB) {
        if ($userB['user_id'] === $userA['user_id']) {
            $found = true;
            break;
        }
    }
    return $found;
}