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<?php $base = ['one' => 10]; $arr1 = ['one' => 1, 'two' => 2]; $arr2 = ['three' => 3]; var_dump(array_merge($arr1, $arr2, $base)); var_dump(array_diff_assoc(array_merge($arr1, $arr2)), $base);
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
array(3) { ["one"]=> int(10) ["two"]=> int(2) ["three"]=> int(3) } array(3) { ["one"]=> int(1) ["two"]=> int(2) ["three"]=> int(3) } array(1) { ["one"]=> int(10) }
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33
array(3) { ["one"]=> int(10) ["two"]=> int(2) ["three"]=> int(3) } Warning: array_diff_assoc(): at least 2 parameters are required, 1 given in /in/0EbRO on line 10 NULL array(1) { ["one"]=> int(10) }
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/0EbRO on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/0EbRO on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/0EbRO on line 3
Process exited with code 255.

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