PHP 7.0.6 Released

    Predefined Constants

    The constants below are defined by this extension, and will only be available when the extension has either been compiled into PHP or dynamically loaded at runtime.

    LIBXML_BIGLINES (integer)
    Allows line numbers greater than 65535 to be reported correctly.

    Note:

    Only available as of PHP 7.0.0 with Libxml >= 2.9.0

    LIBXML_COMPACT (integer)
    Activate small nodes allocation optimization. This may speed up your application without needing to change the code.

    Note:

    Only available in Libxml >= 2.6.21

    LIBXML_DTDATTR (integer)
    Default DTD attributes
    LIBXML_DTDLOAD (integer)
    Load the external subset
    LIBXML_DTDVALID (integer)
    Validate with the DTD
    LIBXML_HTML_NOIMPLIED (integer)
    Sets HTML_PARSE_NOIMPLIED flag, which turns off the automatic adding of implied html/body... elements.

    Note:

    Only available in Libxml >= 2.7.7 (as of PHP >= 5.4.0)

    LIBXML_HTML_NODEFDTD (integer)
    Sets HTML_PARSE_NODEFDTD flag, which prevents a default doctype being added when one is not found.

    Note:

    Only available in Libxml >= 2.7.8 (as of PHP >= 5.4.0)

    LIBXML_NOBLANKS (integer)
    Remove blank nodes
    LIBXML_NOCDATA (integer)
    Merge CDATA as text nodes
    LIBXML_NOEMPTYTAG (integer)
    Expand empty tags (e.g. <br/> to <br></br>)

    Note:

    This option is currently just available in the DOMDocument::save and DOMDocument::saveXML functions.

    LIBXML_NOENT (integer)
    Substitute entities
    LIBXML_NOERROR (integer)
    Suppress error reports
    LIBXML_NONET (integer)
    Disable network access when loading documents
    LIBXML_NOWARNING (integer)
    Suppress warning reports
    LIBXML_NOXMLDECL (integer)
    Drop the XML declaration when saving a document

    Note:

    Only available in Libxml >= 2.6.21

    LIBXML_NSCLEAN (integer)
    Remove redundant namespace declarations
    LIBXML_PARSEHUGE (integer)
    Sets XML_PARSE_HUGE flag, which relaxes any hardcoded limit from the parser. This affects limits like maximum depth of a document or the entity recursion, as well as limits of the size of text nodes.

    Note:

    Only available in Libxml >= 2.7.0 (as of PHP >= 5.3.2 and PHP >= 5.2.12)

    LIBXML_PEDANTIC (integer)
    Sets XML_PARSE_PEDANTIC flag, which enables pedantic error reporting.

    Note:

    Available as of PHP >= 5.4.0

    LIBXML_XINCLUDE (integer)
    Implement XInclude substitution
    LIBXML_ERR_ERROR (integer)
    A recoverable error
    LIBXML_ERR_FATAL (integer)
    A fatal error
    LIBXML_ERR_NONE (integer)
    No errors
    LIBXML_ERR_WARNING (integer)
    A simple warning
    LIBXML_VERSION (integer)
    libxml version like 20605 or 20617
    LIBXML_DOTTED_VERSION (string)
    libxml version like 2.6.5 or 2.6.17
    LIBXML_SCHEMA_CREATE (integer)
    Create default/fixed value nodes during XSD schema validation

    Note:

    Only available in Libxml >= 2.6.14 (as of PHP >= 5.5.2)

    User Contributed Notes

    @oneseventeen
    5 years ago
    When inserting XML DOM Elements inside existing XML DOM Elements that I loaded from an XML file using the following code, none of my new elements were formatted correctly, they just showed up on one line:

    <?php
    $dom     = DOMDocument::load('file.xml');
    $dom->formatOutput = true;
    //$dom->add some new elements with child nodes somewhere inside the loaded XML using insertBefore();
    $dom->saveXML();
    //output: everything looks normal but the new nodes are all on one line.
    ?>

    I found I could pass LIBXML_NOBLANKS to the load method and it would reformat the whole document, including my added stuff:
    <?php
    $dom     = DOMDocument::load('file.xml', LIBXML_NOBLANKS);
    $dom->formatOutput = true;
    //$dom->add some new elements with child nodes somewhere inside the loaded XML using insertBefore();
    $dom->saveXML();
    //output: everything looks newly formatted, including new nodes
    ?>

    Hope this helps, took me hours of trial and error to figure this out!
    zachatwork at gmail dot com
    6 years ago
    Note: The LIBXML_NOXMLDECL constant is defined in this library but is not supported by DOMDocument (yet).

    See also: http://bugs.php.net/bug.php?id=47137

    <?php

    print "PHP_VERSION:      ".PHP_VERSION."\n";
    print     "LIBXML_VERSION:   ".LIBXML_VERSION."\n";
    print     "LIBXML_NOXMLDECL: ".LIBXML_NOXMLDECL."\n";

    $dom = new DomDocument();
    $dom->loadXML("<foo />");

    # This should work but doesn't.

    print "DOMDocument doesn't honor LIBXML_NOXMLDECL:\n";
    print     $dom->saveXML(null,LIBXML_NOXMLDECL);

    # This works, and will still work after the above is fixed.

    print "Forwards compatible workaround:\n";
    $lines = explode("\n", $dom->saveXML(null, LIBXML_NOXMLDECL), 2);
    if(!    preg_match('/^\<\?xml/', $lines[0]))
        print     $lines[0];
    print     $lines[1];

    ?>

    PHP_VERSION:      5.3.1-0.dotdeb.1
    LIBXML_VERSION:   20632
    LIBXML_NOXMLDECL: 2
    DOMDocument doesn't honor LIBXML_NOXMLDECL:
    <?xml version="1.0"?>
    <foo/>
    Forwards compatible workaround:
    <foo/>
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