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<?php $a = array('cifras'=>array(array('ordem'=>1),array('ordem'=>2),array('ordem'=>3))); function abc(&$item) { $item['ordem']++; } array_walk($a['cifras'],'abc'); var_dump($a);
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 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 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
array(1) { ["cifras"]=> array(3) { [0]=> array(1) { ["ordem"]=> int(2) } [1]=> array(1) { ["ordem"]=> int(3) } [2]=> array(1) { ["ordem"]=> int(4) } } }

preferences:
265.09 ms | 406 KiB | 353 Q