(PHP 4, PHP 5, PHP 7)
mhash_get_hash_name — Gets the name of the specified hash
mhash_get_hash_name ( int $algo ) : string|false
 Gets the name of the specified algo. 
algo
 The hash ID. One of the MHASH_hashname constants. 
 Returns the name of the hash or false, if the hash does not exist. 
Example #1 mhash_get_hash_name() Example
<?php echo mhash_get_hash_name(MHASH_MD5); // MD5 ?>
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    https://www.php.net/manual/en/function.mhash-get-hash-name.php