PHP – Truncate a string to a given length

This is a function I use to display the ellipses when I want to truncate and display a summary of a larger body of text.

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<?php function truncateString($intLength = 0, $strText = "") {     if ($intLength == 0) {         return $strText;     }          if (strlen($strText) > $intLength) {         preg_match("/[a-zA-Z0-9]{0, " . $intLength . "}/", $strText, $strNewText);         return ($strNewText . "...");     }     else {         return $strText;     } } ?>