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<?php $a1 = [ "a" => 2, "b" => 0, "c" => 5, ]; $a2 = [ "a" => 3, "b" => 9, "c" => 7, "d" => 10, ]; $a3 = [ 'b' => 5, 'e' => 10, ]; var_export( array_map( fn($v) => array_sum((array) $v), array_merge_recursive($a1, $a2, $a3) ) );
Output for 7.4.33, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
array ( 'a' => 5, 'b' => 14, 'c' => 12, 'd' => 10, 'e' => 10, )
Output for 7.3.6
Parse error: syntax error, unexpected '=>' (T_DOUBLE_ARROW), expecting ')' in /in/TI2VI on line 23
Process exited with code 255.
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62.79 ms | 996 KiB | 4 Q