# Posted By

ajbatac on 10/05/09

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# Short URL function

/ Published in: PHP
`<?php// ---------------------------------------------------------------// Converts decimal to alphanumeric values// ---------------------------------------------------------------// 62 possibles per letter, counting from 1.// With 1 letter,  61 URLS// With 2 letters, 3,843 URLS// With 3 letters, 238,327 URLS// With 4 letters, 15,252,991 URLS// --------------------------------------------------------------- \$chrs = array('0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S' ,'T', 'U', 'V', 'W', 'X', 'Y', 'Z'); function int_to_alph(\$int, \$chrs){  \$base = sizeof(\$chrs);  do {    \$alph = \$chrs[(\$int % \$base)] . \$alph;  } while(\$int = intval(\$int / \$base));  return \$alph;} function alph_to_int(\$alph, \$chrs){  \$base = sizeof(\$chrs);  for(\$i = 0, \$int = 0; \$i < strlen(\$alph); \$i++)  {    \$int += intval(array_search(substr(\$alph, strlen(\$alph) - \$i - 1, 1), \$chrs)) * pow(\$base, \$i);  }  return \$int;}?>`