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15 years ago
The following will make a string completely safe for XML:

<?php
function philsXMLClean($strin) {
        $strout = null;

        for ($i = 0; $i < strlen($strin); $i++) {
                $ord = ord($strin[$i]);

                if (($ord > 0 && $ord < 32) || ($ord >= 127)) {
                        $strout .= "&amp;#{$ord};";
                }
                else {
                        switch ($strin[$i]) {
                                case '<':
                                        $strout .= '&lt;';
                                        break;
                                case '>':
                                        $strout .= '&gt;';
                                        break;
                                case '&':
                                        $strout .= '&amp;';
                                        break;
                                case '"':
                                        $strout .= '&quot;';
                                        break;
                                default:
                                        $strout .= $strin[$i];
                        }
                }
        }

        return $strout;
}
?>
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