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<?php $array = [ ['x' => 0.5, 'y' => 23], ['x' => 23, 'y' => 21.75], ['x' => 14.25, 'y' => 21.875], ['x' => 19.375, 'y' => 21.75], ['x' => 9.125, 'y' => 21.875], ['x' => 23, 'y' => 19.625], ['x' => 19.375, 'y' => 19.625], ]; foreach ($array as $row) { $result['#' . $row['y']] ??= $row; } var_export(array_values($result));
Output for git.master, git.master_jit, rfc.property-hooks
array ( 0 => array ( 'x' => 0.5, 'y' => 23, ), 1 => array ( 'x' => 23, 'y' => 21.75, ), 2 => array ( 'x' => 14.25, 'y' => 21.875, ), 3 => array ( 'x' => 23, 'y' => 19.625, ), )

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