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run code in 150+ php & hhvm versions
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<?php $arr = [ ['email' => 'a'], ['email' => 'b'], ['email' => 'c'] ]; var_dump(array_reduce($arr, function($str, $item) { return $str.', ' . $item['email']; }));
Output for 5.4.0 - 7.1.0
string(9) ", a, b, c"
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/CEJQt on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/CEJQt on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/CEJQt on line 3
Process exited with code 255.