PHP/String/String Length

Finding the Length of a String with strlen()

<?
$membership = "asdfadsf";
if ( strlen( $membership ) == 4 )
    print "Thank you!";
else
    print "Your membership number must have 4 digits<P>";
?>

Limit string length and display "..."

<?php
   // Limit $summary to how many characters?
   $limit = 100;
$summary = <<< summary
Text Text Text Text Text Text Text Text Text Text Text Text 
Text Text Text Text Text Text Text Text Text 
Text Text Text Text Text Text Text Text Text Text 
Text Text Text Text Text Text Text Text Text 
Text Text Text Text Text Text Text Text Text Text 
Text Text Text Text Text Text Text Text Text Text 
summary;
   if (strlen($summary) > $limit)
      $summary = substr($summary, 0, strrpos(substr($summary, 0, $limit), " ")) . "...";
      echo $summary;
?>