URL: http://www.php.net/manual/en/ref.xml.php

how the files are opened is not the correct way or the input/output may get mixed up or truncated on same cases...

I mean ... you should not open files in blocks, but whole file ... I copy pasted your example to my code and when some block (of those 4096 bytes) end and next blocks start value somehow happened to be in the middle XML value, then the value was truncated or cutted half in output. anyway the input (cycle) should be in one piece (whole file at once) or row by row, not by constant number of bytes.



Example 1. (your version)

$file = "data.xml";
$depth = array();

function startElement($parser, $name, $attrs) {
    global $depth;
    for ($i = 0; $i < $depth[$parser]; $i++) {
        print "  ";
    }
    print "$name\n";
    $depth[$parser]++;
}

function endElement($parser, $name) {
    global $depth;
    $depth[$parser]--;
}

$xml_parser = xml_parser_create();
xml_set_element_handler($xml_parser, "startElement", "endElement");
if (!($fp = fopen($file, "r"))) {
    die("could not open XML input");
}

while ($data = fread($fp, 4096)) {
    if (!xml_parse($xml_parser, $data, feof($fp))) {
        die(sprintf("XML error: %s at line %d",
                    xml_error_string(xml_get_error_code($xml_parser)),
                    xml_get_current_line_number($xml_parser)));
    }
}
xml_parser_free($xml_parser);




BUT THIS SHOULD BE (my version):

Example 1.

$file = "data.xml";
$depth = array();

function startElement($parser, $name, $attrs) {
    global $depth;
    for ($i = 0; $i < $depth[$parser]; $i++) {
        print "  ";
    }
    print "$name\n";
    $depth[$parser]++;
}

function endElement($parser, $name) {
    global $depth;
    $depth[$parser]--;
}

$xml_parser = xml_parser_create();
xml_set_element_handler($xml_parser, "startElement", "endElement");
if (!($fp = fopen($file, "r"))) {
    die("could not open XML input");
}

$data = fread($fp, filesize($file)));
if (!xml_parse($xml_parser, $data, feof($fp)))
{
die(sprintf("XML error: %s at line %d",
xml_error_string(xml_get_error_code($xml_parser)),
xml_get_current_line_number($xml_parser)));
}

xml_parser_free($xml_parser);