PHP Beginner's XML Parser

XML Parser

All modern browsers have built-in XML parsers.

The XML parser converts the XML document into an XML DOM object - an object that can be manipulated through JavaScript

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Next we write a php file to operate the above code

";break; case "TO": echo "To: ";break; case "FROM": echo "From: ";break; case "HEADING": echo "Heading: ";break; case "BODY": echo "Message: "; } } //Function to use at the end of an element function stop($parser,$element_name){ echo "
"; } //Function to use when finding character data function char($parser,$data){ echo $data; } //Specify element handler xml_set_element_handler($parser,"start","stop"); //Specify data handler xml_set_character_data_handler($parser,"char"); //Open XML file $fp=fopen("test.xml","r"); //Read data while ($data=fread($fp,4096)){ xml_parse($parser,$data,feof($fp)) or die (sprintf("XML Error: %s at line %d", xml_error_string(xml_get_error_code($parser)), xml_get_current_line_number($parser))); } //Free the XML parser xml_parser_free($parser); ?>

Working principle:

Initialize the XML parser through the xml_parser_create() function

Create functions that match different event handlers

Add xml_set_element_handler( ) function to define which function is executed when the parser encounters the start and end tags

Add the xml_set_character_data_handler() function to define which function is executed when the parser encounters character data

Pass xml_parse() function to parse the file "test.xml"

In case there is an error, add the xml_error_string() function to convert the XML error into a text description

Call the xml_parser_free() function to release the allocation Memory given to xml_parser_create() function