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<?php $a = array( array( 'x' => 0, 'y' => 1 ), array( 'x' => 2, 'y' => 3 ), array( 'x' => 0, 'y' => 1 ), array( 'x' => 2, 'y' => 3 ), array( 'x' => 0, 'y' => 1 ), array( 'x' => 2, 'y' => 3 ), array( 'x' => 0, 'y' => 1 ), array( 'x' => 2, 'y' => 3 ), array( 'x' => 0, 'y' => 1 ), array( 'x' => 2, 'y' => 3 ), array( 'x' => 0, 'y' => 1 ), array( 'x' => 2, 'y' => 3 ) ); foreach ($a as $id => $b) { $a[$id]['x'] += 10; $a[$id]['y'] -= 10; } print_r($a);

preferences:
40.93 ms | 402 KiB | 5 Q