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<?php $hashes = array_map(function ($num) { return substr(md5($num), 0, 8); }, range(0, 1000000)); print_r(array_slice($hashes, 0, 10)); if (array_unique($hashes) == $hashes) { echo 'all unique'; } else { echo 'collisions detected'; }
Output for git.master, rfc.property-hooks
Fatal error: Out of memory (allocated 18878464 bytes) (tried to allocate 16777224 bytes) in /in/UY2HT on line 3 mmap() failed: [12] Cannot allocate memory mmap() failed: [12] Cannot allocate memory
Process exited with code 255.
Output for git.master_jit
Fatal error: Out of memory (allocated 2097152 bytes) (tried to allocate 16777224 bytes) in /in/UY2HT on line 3 mmap() failed: [12] Cannot allocate memory mmap() failed: [12] Cannot allocate memory
Process exited with code 255.

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