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

<?xml version="1.0" encoding="ISO-8859-1"?>
<note>
<to>Tove</to>
<from>Jani</from>
<heading>Reminder</heading>
<body>Don't forget me this weekend!</body>
</note>

Next we write a php file to operate the above code

<?php
//Initialize the XML parser
$parser=xml_parser_create();

//Function to use at the start of an element
function start($parser,$element_name,$element_attrs){
    switch($element_name){
    case "NOTE":
    echo "-- Note --<br>";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 "<br>";
}
//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

Continuing Learning

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<?php echo "学习ajax"; ?>

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Automatic operation

PHP Beginner's XML Parser

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