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<?php
class XmlTypeCheck {
/**
* Will be set to true or false to indicate whether the file is
* well-formed XML. Note that this doesn't check schema validity.
*/
public $wellFormed = false;
/**
* Will be set to true if the optional element filter returned
* a match at some point.
*/
public $filterMatch = false;
/**
* Name of the document's root element, including any namespace
* as an expanded URL.
*/
public $rootElement = '';
/**
* @param $file string filename
* @param $filterCallback callable (optional)
* Function to call to do additional custom validity checks from the
* SAX element handler event. This gives you access to the element
* namespace, name, and attributes, but not to text contents.
* Filter should return 'true' to toggle on $this->filterMatch
*/
function __construct( $file, $filterCallback=null ) {
$this->filterCallback = $filterCallback;
$this->run( $file );
}
private function run( $fname ) {
$parser = xml_parser_create_ns( 'UTF-8' );
// case folding violates XML standard, turn it off
xml_parser_set_option( $parser, XML_OPTION_CASE_FOLDING, false );
xml_set_element_handler( $parser, array( $this, 'rootElementOpen' ), false );
$file = fopen( $fname, "rb" );
do {
$chunk = fread( $file, 32768 );
$ret = xml_parse( $parser, $chunk, feof( $file ) );
if( $ret == 0 ) {
// XML isn't well-formed!
fclose( $file );
xml_parser_free( $parser );
return;
}
} while( !feof( $file ) );
$this->wellFormed = true;
fclose( $file );
xml_parser_free( $parser );
}
private function rootElementOpen( $parser, $name, $attribs ) {
$this->rootElement = $name;
if( is_callable( $this->filterCallback ) ) {
xml_set_element_handler( $parser, array( $this, 'elementOpen' ), false );
$this->elementOpen( $parser, $name, $attribs );
} else {
// We only need the first open element
xml_set_element_handler( $parser, false, false );
}
}
private function elementOpen( $parser, $name, $attribs ) {
if( call_user_func( $this->filterCallback, $name, $attribs ) ) {
// Filter hit!
$this->filterMatch = true;
}
}
}
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