2 Neat Little PHP Tricks

Posted on 03/16/2010 at 04:15 pm by Kevin Wentworth
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In writing a function to validate bank routing numbers, I came across two simple techniques, that I know I will need to use again:

PHP Trick 1: Remove All Characters Except Numbers from a String

A simple little regex does the trick:

  1. $routingNumber = preg_replace('[\D]', '', $routingNumber);

PHP Trick 2: Loop Through a String Character by Character

Setting two variables in a for loop does the trick (that could be trick number 3...):

  1. for ($i = 0, $j = strlen($routingNumber); $i < $j; $i++ ) {
  2.     echo $routingNumber[$i]; //access to each character in a string
  3. }

-Kevin Wentworth

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Php | Example | Tutorial | Web Programming

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