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<?php $a = ['A[1]', 'B[2]', 'C[2]', 'D[2]']; $b = ['B[3]', 'C[4]', 'E[4]', 'F[2]', 'G[2]']; var_export( array_values( array_reduce( array_merge($a, $b), function($result, $v) { $result[strtok($v, '[')] = $v; return $result; } ) ) );
Output for git.master, git.master_jit, rfc.property-hooks
array ( 0 => 'A[1]', 1 => 'B[3]', 2 => 'C[4]', 3 => 'D[2]', 4 => 'E[4]', 5 => 'F[2]', 6 => 'G[2]', )

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