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@ 2016-08-23T14:50:41Z

<?php

$originalArray = [
    [
        'entity_id' => '131813'
    ],
    [
        'entity_id' => '213808'
    ],
    [
        'entity_id' => '712885'
    ]
];

$clean = array_map(function($value) {
    return $value['entity_id'];
}, $originalArray);

print_r($clean);

Output
Performance
VLD
References
Branches

array_map: documentation ( source)
print_r: documentation ( source)

preferences:dark modelive previewkey bindings

28.64 ms | 405 KiB | 5 Q