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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) { $b['x'] += 10; $b['y'] -= 10; } print_r($a);

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