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@ 2016-01-25T16:07:46Z

<?php

$data = [
    // ['order' => null, 'seriesId' => 2],
    // ['order' => 0, 'seriesId' => 1],
];

function validateOrderUniqueness(array $data)
{
    $orders = array_filter(array_column($data, 'order'));
    $uniqueOrders = array_unique($orders);

    if ($orders !== $uniqueOrders) {
        throw new \Exception('validateOrderUniqueness fail');
    }
}
    
function validateSeriesUniqueness(array $data)
{
    $seriesIds = array_column($data, 'seriesId');
    $uniqueSeriesIds = array_unique($seriesIds);

    if ($seriesIds !== $uniqueSeriesIds) {
        throw new \Exception('validateSeriesUniqueness fail');
    }
}

$existing = [1, 2, 3];

validateOrderUniqueness($data);
validateSeriesUniqueness($data);

if (count(array_diff($existing, $seriesIds)) > 0) {
    $this->error(self::MISSING_ORDER_OF_SERIES);
}

if (count(array_diff($seriesIds, $existing)) > 0) {
    $this->error(self::NON_EXISTING_SERIES);
}

Output for git.master, git.master_jit, rfc.property-hooks: Warning: Undefined variable $seriesIds in /in/cYSUR on line 33 Fatal error: Uncaught TypeError: array_diff(): Argument #2 must be of type array, null given in /in/cYSUR:33 Stack trace: #0 /in/cYSUR(33): array_diff(Array, NULL) #1 {main} thrown in /in/cYSUR on line 33
Process exited with code 255.

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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