DOMXPath::quote(string $str): string (#13456)

Method to quote strings in XPath, similar to PDO::quote() / mysqli::real_escape_string.

Sample usage: $xp->query("//span[contains(text(

DOMXPath::quote(string $str): string (#13456)

Method to quote strings in XPath, similar to PDO::quote() / mysqli::real_escape_string.

Sample usage: $xp->query("//span[contains(text()," . $xp->quote($string) . ")]")

The algorithm is derived from Robert Rossney's research into XPath quoting published at https://stackoverflow.com/a/1352556/1067003
But using an improved implementation I wrote myself, originally for https://github.com/chrome-php/chrome/pull/575

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