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<?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 for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
Array ( [0] => 131813 [1] => 213808 [2] => 712885 )

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