PHP XPath implementation of XML and HTML file fast parsing (with XML small database implementation of six-level word fast query instance)

PHP XPath implementation of XML and HTML file fast parsing (with XML small database implementation of six-level word fast query instance)

First, XPath simple introduction

XPATH, XQUERY specifically queries XML language, fast query speed

How to use:

(1) Creating the DOM tool and loading the XML file

$xml = new DOMDocument (' 1.0 ', ' utf-8 ');

$xml-Load ('./dict.xml ');

Note: If you parse the HTML file quickly, the same reason

Use Loadhtmlfile (' dict.html ') here;

(2) Creating an XPath parsing tool

$xpath = new Domxpath ($xml);

(3) Writing an XPath query statement

$sql = '/dict/word[name= '. $word. ' "] /name ';

NOTE: If the HTML file is parsed quickly

$sql = '/html/body/div/h2 '; Get the contents under the H2 tag under the div below the body

(4) Query statement, return results

$words = $xpath->query ($sql);

Here are some syntax for the query statement table

Second, XML small database implementation of six-level word fast query instance

Preliminary version: Cons: Slow query speed

Receive the word and parse the XML query for the corresponding word

$word = isset ($_get[' word ')? Trim ($_get[' word ']): ";

if (empty ($word)) {

Exit ("I am sorry,i can ' t catch the word!");

}else{

$xml = new DOMDocument (' 1.0 ', ' utf-8 ');

$xml-Load ('./dict.xml ');

* DOM implementation parsing and querying

$namelist = $xml->getelementsbytagname (' name ');

$value = Array ();

$isfind = false;

foreach ($namelist as $v) {

if (($v->nodevalue) = = $word) {

Print_r ($v);

Echo $word, "<br/>";

echo "meaning:", $v->nextsibling->nodevalue, "<br/>";

echo "Example:", $v->nextsibling->nextsibling->nodevalue, "<br/>";

$value [' Word '] = $word;

$value [' meaning '] = $v->nextsibling->nodevalue;

$value [' Example '] = str_replace ('/r/n ', "<br/>", $v->nextsibling->nextsibling->nodevalue);

$isfind = true;

Break

}

}

if (! $isfind)

echo "<br/>

Improved version with XPath: fast speed

Usage examples:

$word = isset ($_get[' word ')? Trim ($_get[' word ']): ";

if (empty ($word)) {

Exit ("I am sorry,i can ' t catch the word!");

}else{

$xml = new DOMDocument (' 1.0 ', ' utf-8 ');

$xml-Load ('./dict.xml ');

$xpath = new Domxpath ($xml);

Query Dict The following word, and the//name node under name= $word node

$sql = '/dict/word[name= '. $word. ' "] /name ';

$words = $xpath->query ($sql);

if ($words->length = = 0) {//If the word is not

echo "<br/>

Exit

}

To this step, the explanation found

Echo "<b>Word:</b>", "&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;", "<b > $word

</B> "," <br/> ";

echo "<b>Meaning:</b>", $name->nextsibling->nodevalue, "<br/>";

echo "<b>Example:</b>", $name->nextsibling->nextsibling->nodevalue, "<br/>";

$value [' Word '] = $word;

$value [' meaning '] = $name->nextsibling->nodevalue;

$value [' Example '] = str_replace ('/r/n ', "<br/>", $name->nextsibling->nextsibling->nodevalue);

}

Attach the HTML file code:

 

The result is as follows:

Using XPath to quickly query an instance of an HTML file

$html = new DOMDocument (' 1.0 ', ' utf-8 ');

$html-Loadhtmlfile ('./dict.html ');

$xpath = new Domxpath ($html);

$sql = '/html/body/div/h2 '; Get the contents under the H2 tag under the div below the body

Echo $xpath->query ($sql)->item (0)->nodevalue;

PHP XPath implementation of XML and HTML file fast parsing (with XML small database implementation of six-level word fast query instance)