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run code in 200+ php & hhvm versions

@

<?php

$a = [
    [
        "id" => 1,
        "controller" => "users",
        "action" => "index"
    ],
    [
        "id" => 1,
        "controllers" => "users",
        "action" => ""
    ],
    [
        "id" => 1,
        "controller" => "users",
        "action" => "login"
    ]
];

$b = [
    [
        "id" => 1,
        "controller" => "users",
        "action" => "index"
    ],
    [
        "id" => 1,
        "controllers" => "users",
        "action" => ""
    ],
    [
        "id" => 1,
        "controller" => "users",
        "action" => "logout"
    ]
];


$final = array();
foreach($a AS $item) {
    $final[$item['controller'] . $item['action']] = $item;
}

foreach($b AS $item) {
    unset($final[$item['controller'] . $item['action']]);
}

$final = array_values($final);
print_r($final);

print_r($final);

eol versions

Output for 5.4.0 - 7.2.0: Notice: Undefined index: controller in /in/XgCpH on line 42 Notice: Undefined index: controller in /in/XgCpH on line 46 Array ( [0] => Array ( [id] => 1 [controller] => users [action] => login ) ) Array ( [0] => Array ( [id] => 1 [controller] => users [action] => login ) )
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29: Parse error: syntax error, unexpected '[' in /in/XgCpH on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5: Parse error: parse error, unexpected '[' in /in/XgCpH on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Parse error: parse error in /in/XgCpH on line 3
Process exited with code 255.