Remove Invalid XML Characters

Created by ltp, last update on 26/02/2008 17:30

When you are writing out an XML document there are certain characters that are not allowed in the document. If these characters exist, you will be unable to parse the document as per the XML specification.What this function will do is take a string, remove the invalid characters and then return the string back to you to insert into an XML document.

/**
 * Removes invalid XML
 *
 * @access public
 * @param string $value
 * @return string
 */
function stripInvalidXml($value)
{
    $ret = "";
    $current;
    if (empty($value)) 
    {
        return $ret;
    }
 
    $length = strlen($value);
    for ($i=0; $i < $length; $i++)
    {
        $current = ord($value{$i});
        if (($current == 0x9) ||
            ($current == 0xA) ||
            ($current == 0xD) ||
            (($current >= 0x20) && ($current <= 0xD7FF)) ||
            (($current >= 0xE000) && ($current <= 0xFFFD)) ||
            (($current >= 0x10000) && ($current <= 0x10FFFF)))
        {
            $ret .= chr($current);
        }
        else
        {
            $ret .= " ";
        }
    }
    return $ret;
}

Dependencies

No special requirements are needed by this snippet

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