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@ 2018-12-16T07:34:48Z

<?php
$array = array (
    'pubMessages' => 
    array (
        0 => 
        array (
            'msg' => 'Not bad',
            'type' => 'warning',
        ),
        1 => 
        array (
            'msg' => 'Bad',
            'type' => 'error',
        ),
    ),
);

$dynamicKey = array_keys($array)[0];
foreach($array[$dynamicKey] as $key=>$item){
    if ($item['type'] == 'error')
        unset($array[$dynamicKey][$key]);
}

var_dump($array);

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
array_keys: documentation ( source)

preferences:dark modelive preview

51.29 ms | 402 KiB | 5 Q