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<?php $foo = [ 'a' => '1', 'b' => '1', 'c' => '2', ]; $foo2 = array_combine($foo, $foo); $foo3 = array_map(function($v) { return '#' . $v; }, $foo2); $foo4 = array_fill_keys($foo3, $foo); var_dump($foo4);
Output for 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 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 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
array(2) { ["#1"]=> array(3) { ["a"]=> string(1) "1" ["b"]=> string(1) "1" ["c"]=> string(1) "2" } ["#2"]=> array(3) { ["a"]=> string(1) "1" ["b"]=> string(1) "1" ["c"]=> string(1) "2" } }
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/58riZ 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/58riZ on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/58riZ on line 3
Process exited with code 255.

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