Generating XML document in PHP (escape characters)

Question

I\'m generating an XML document from a PHP script and I need to escape the XML special characters. I know the list of characters that should be escaped; but what is the corr

Answer 1

Based on the solution of sadeghj the following code worked for me:

/**
 * @param $arr1 the single string that shall be masked
 * @return the resulting string with the masked characters
 */
function replace_char($arr1)
{
    if (strpos ($arr1,'&')!== FALSE) { //test if the character appears 
        $arr1=preg_replace('/&/','&', $arr1); // do this first
    }

    // just encode the
    if (strpos ($arr1,'>')!== FALSE) {
        $arr1=preg_replace('/>/','>', $arr1);
    }
    if (strpos ($arr1,'<')!== FALSE) {
        $arr1=preg_replace('/