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 mhash_count    (PHP 3>= 3.0.9, PHP 4 ) mhash_count -- Get the highest available hash id Descriptionint  mhash_count ( void ) 
     mhash_count() returns the highest available hash
     id. Hashes are numbered from 0 to this hash id.
     
      例子 1. Traversing all hashes 
<?php
  $nr = mhash_count();
  for ($i = 0; $i <= $nr; $i++) {     echo sprintf("The blocksize of %s is %d\n",          mhash_get_hash_name($i),         mhash_get_block_size($i)); } ?>
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