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<?php function mycallback(&$result, $current) { $result[$current] = $current; } var_dump(array_reduce('mycallback', range('a', 'z')));
Output for 5.3.0 - 5.6.28, 7.0.0 - 7.1.0
Warning: array_reduce() expects parameter 1 to be array, string given in /in/LcVPJ on line 7 NULL
Output for hhvm-3.10.0 - 3.12.0
Warning: array_reduce() expects parameter 1 to be an array or collection in /in/LcVPJ on line 7 NULL
Output for 4.3.2 - 5.2.17
Warning: array_reduce(): The first argument should be an array in /in/LcVPJ on line 7 NULL
Output for 4.3.0 - 4.3.1
Warning: array_reduce() [http://www.php.net/function.array-reduce]: The first argument should be an array in /in/LcVPJ on line 7 NULL