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@ 2013-12-14T10:58:33Z

<?php

  $input = "the number of letters in mississippi = 12";
  $i=0;
  $cp = $input;
  while( !(ctype_digit($cp[$i++]) ) )
   ;
  echo $cp[--$i],$cp[$i],"\n";

Output
Performance
VLD
References
Branches

ctype_digit: documentation ( source)

preferences:dark modelive preview

42.54 ms | 402 KiB | 5 Q