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<?php var_dump( ['a' => 1, 'b' => 2] + ['b' => 3, 'c' => 4] );
Output for 7.0.0 - 7.0.31, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
array(3) { ["a"]=> int(1) ["b"]=> int(2) ["c"]=> int(4) }

preferences:
187.34 ms | 403 KiB | 207 Q