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run code in 300+ PHP versions simultaneously
<?php $hash = str_pad(dechex(18583), 8, "0", STR_PAD_LEFT); $hash2 = substr_replace($hash, 'f', 0, 1); printf("hash = %s, new hash = %s", $hash, $hash2);
Output for git.master, git.master_jit, rfc.property-hooks
hash = 00004897, new hash = f0004897

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