What is XML Expert Parser in PHP
In this article I am going to explain about XML Expert Parser.
PHP XML Expert Parser
The PHP bulit-in expert parser offers an improved variety of XML parsing techniques. Expert is a stream-oriented parser. The expert parser is used to read and update , create and manipulate operation for an XML document. The XML Expert parser function are part of the PHP core.
There are two basic type of XMl parser:
- Tree-based parser
The tree based parser is used to load the entire XML document into memory and provides access to the tree element. e.g, Document object model (DOM).
- Event based parser
Event based parser is used when a specific event occurs, it call a function to handle it.
Example of Expert parser
To reading a XML file , follow the fallowing steps:
First create an XML file:
|
<?xml version="1.0" encoding="ISONO"?>
<note>
<to>Mcn_Solution</to>
<from>Dinesh</from>
<heading>Singhr</heading>
<body>Don't forget me this weekend!</body>
</note>
|
After it, create a PHP application for reading an XML file:
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<html>
<body>
<?php
$parser=xml_parser_create();
function start($parser,$element_name,$element_attrs)
{
switch($element_name)
{
case "NOTE":
echo "-- Note --<br />";
break;
case "TO":
echo "To: ";
break;
case "FROM":
echo "From: ";
break;
case "HEADING":
echo "Heading: ";
break;
case "BODY":
echo "Message: ";
}
}
function stop($parser,$element_name)
{
echo "<br />";
}
function char($parser,$data)
{
echo $data;
}
xml_set_element_handler($parser,"start","stop");
xml_set_character_data_handler($parser,"char");
$fp=fopen("test.xml","r"); // open and reading a XML file.
while ($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)));
}
xml_parser_free($parser);
?>
</body>
</html>
|
Output:
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