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<?php $hashes = array_map(function ($num) { return substr(md5($num), 0, 8); }, range(0, 100000)); print_r(array_slice($hashes, 0, 10)); if (array_unique($hashes) == $hashes) { echo 'all unique'; } else { echo 'collisions detected'; }
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 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 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Array ( [0] => cfcd2084 [1] => c4ca4238 [2] => c81e728d [3] => eccbc87e [4] => a87ff679 [5] => e4da3b7f [6] => 1679091c [7] => 8f14e45f [8] => c9f0f895 [9] => 45c48cce ) collisions detected
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION, expecting ')' in /in/kFIik 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 T_FUNCTION, expecting ')' in /in/kFIik on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `')'' in /in/kFIik on line 3
Process exited with code 255.

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