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    <p>I've been able to reproduce the problem. If you add a debug line to print out the text returned by fread(), you will see that a response from the server is getting split into two pieces:</p> <p>Piece 1: <code>&lt;</code></p> <p>Piece 2: <code>challenge xmlns='urn:ietf:params:xml:ns:xmpp-sasl'&gt;dmVyc2lvbj0xJm1ldGhvZD1hdXRoLnxmwHBfbG2naW4mbm9uY2U9RDI5Qjc1QUZIRORCRkUzOUE5NzYwQ0U5QkNFOUIzREM=&lt;/challenge&gt;</code></p> <p>I assume this is because the TCP packets are fragmented, but I haven't checked.</p> <p>One way to deal with this is to modify recv_xml() so that it keeps reading more information until the XML parse returns non-empty data:</p> <pre><code>function recv_xml($fp, $size=4096) { $xml = fread($fp, $size); if ($xml === "") { return null; } // parses xml $xml_parser = xml_parser_create(); xml_parse_into_struct($xml_parser, $xml, $val, $index); xml_parser_free($xml_parser); while (count($val) == 0) { // The parse failed. We probably got a partial packet. Read more $xml .= fread($fp, $size); // Have to create a new parser each time the XML changes. $xml_parser = xml_parser_create(); xml_parse_into_struct($xml_parser, $xml, $val, $index); xml_parser_free($xml_parser); } return array($val, $index); } </code></pre> <p>Edward Komissarov's answer should also fix the problem, since he directly adds that missing angular bracket. The code I have provided should work even if the split happens somewhere else.</p> <p>It's worth recognizing that the overall code is still quite brittle; it appears to be a proof of concept and not production-ready.</p>
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    1. USDavid Sickmiller
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