http://blog.csdn.net/morewindows/article/details/7102362
Reading and writing XML files with PHP_PHP tutorial
PHP can easily generate and read XML files. PHP mainly completes XML reading and writing operations through DOMDocument, DOMElement and DOMNodeList. Below is a brief explanation of how to use these classes.
1. Generate XML file
For an XML file as follows.
[html]
http://blog.csdn.net/morewindows/article/details/7102362
http://blog.csdn.net/morewindows/article/details/7102362
Let’s see how to generate it using PHP:
First create a new DOMDocument object and set the encoding format.
$dom = newDOMDocument('1.0', 'UTF-8');
$dom->formatOutput= true;
Create the
$rootelement =$dom->createElement("article");
$title =$dom->createElement("title", "PHP Access MySql Database - Elementary");
Then create a node with text content
$link =$dom->createElement("link","http://blog.csdn.net/morewindows/article/details/7102362");
You can also generate a node first and then add text content to it.
$link = $dom->createElement("link");
$linktext =$dom->createTextNode('http://blog.csdn.net/morewindows/article/details/7102362');
$link->appendChild($linktext);
Then add the
$rootelement->appendChild($title);
$rootelement->appendChild($link);
Finally, add the
$dom->appendChild($rootelement);
A complete XML is now generated. Then regenerate the entire XML,
echo $dom->saveXML() ;
saveXML() can also input only part of the XML text. For example, echo $dom->saveXML($link); will only output the node: http://blog.csdn. net/morewindows/article/details/7102362
The following is a complete example of outputting data content to an XML file in PHP. This example will output a PHP array to an XML file.
[php]
//Output the array into an XML file
// by MoreWindows( http://blog.csdn.net/MoreWindows )
$article_array = array(
"First article" => array(
"title"=>"Access MySql Database with PHP - Elementary",
"link"=>"http://blog.csdn.net/morewindows/article/details/7102362"
),
"Part 2" => array(
"title"=>"PHP Access MySql Database Intermediate Smarty Technology",
"link"=>"http://blog.csdn.net/morewindows/article/details/7094642"
),
"Part 3" => array(
"title"=>"PHP Access MySql Database Advanced AJAX Technology",
"link"=>"http://blog.csdn.net/morewindows/article/details/7086524"
),
);
$dom = new DOMDocument('1.0', 'UTF-8');
$dom->formatOutput = true;
$rootelement = $dom->createElement("MoreWindows");
foreach ($article_array as $key=>$value)
{
$article = $dom->createElement("article", $key);
$title = $dom->createElement("title", $value['title']);
$link = $dom->createElement("link", $value['link']);
$article->appendChild($title);
$article->appendChild($link);
$rootelement->appendChild($article);
}
$dom->appendChild($rootelement);
$filename = "D:\test.xml";
echo 'XML file size' . $dom->save($filename) . 'Bytes';
?>
//Output the array to an XML file
// by MoreWindows( http://blog.csdn.net/MoreWindows )
$article_array = array(
"First article" => array(
"title"=>"Access MySql database with PHP - Elementary",
"link"=>"http://blog.csdn.net/morewindows/article/details/7102362"
),
"Part 2" => array(
"title"=>"PHP Access MySql Database Intermediate Smarty Technology",
"link"=>"http://blog.csdn.net/morewindows/article/details/7094642"
),
"Part 3" => array(
"title"=>"PHP Access MySql Database Advanced AJAX Technology",
"link"=>"http://blog.csdn.net/morewindows/article/details/7086524"
),
);
$dom = new DOMDocument('1.0', 'UTF-8');
$dom->formatOutput = true;
$rootelement = $dom->createElement("MoreWindows");
foreach ($article_array as $key=>$value)
{
$article = $dom->createElement("article", $key);
$title = $dom->createElement("title", $value['title']);
$link = $dom->createElement("link", $value['link']);
$article->appendChild($title);
$article->appendChild($link);
$rootelement->appendChild($article);
}
$dom->appendChild($rootelement);
$filename = "D:\test.xml";
echo 'XML file size' . $dom->save($filename) . 'Bytes';
?>
Running this PHP will generate the test.xml file on the D drive (Win7 + XAMPP + IE9.0 test passed)
2. Read XML file
Take reading the D:\test.xml generated in the previous article as an example:
[php]
//读取XML文件
// by MoreWindows( http://blog.csdn.net/MoreWindows )
$filename = "D:\test.xml";
$article_array = array();
$dom = new DOMDocument('1.0', 'UTF-8');
$dom->load($filename);
//得到
$articles = $dom->getElementsByTagName("article");
echo '
foreach ($articles as $article)
{
$id = $article->getElementsByTagName("id")->item(0)->nodeValue;
$title = $article->getElementsByTagName("title")->item(0)->nodeValue;
$link = $article->getElementsByTagName("link")->item(0)->nodeValue;
$article_array[$id] = array('title'=>$title, 'link'=>$link);
}
//输出结果
echo ""; <br>
var_dump($article_array); <br>
echo "
";
?>
//读取XML文件
// by MoreWindows( http://blog.csdn.net/MoreWindows )
$filename = "D:\test.xml";
$article_array = array();
$dom = new DOMDocument('1.0', 'UTF-8');
$dom->load($filename);
//得到
$articles = $dom->getElementsByTagName("article");
echo '
foreach ($articles as $article)
{
$id = $article->getElementsByTagName("id")->item(0)->nodeValue;
$title = $article->getElementsByTagName("title")->item(0)->nodeValue;
$link = $article->getElementsByTagName("link")->item(0)->nodeValue;
$article_array[$id] = array('title'=>$title, 'link'=>$link);
}
//输出结果
echo "
";<br> var_dump($article_array);<br> echo "";
?>
运行结果如下:
摘自 MoreWindows

TomakePHPapplicationsfaster,followthesesteps:1)UseOpcodeCachinglikeOPcachetostoreprecompiledscriptbytecode.2)MinimizeDatabaseQueriesbyusingquerycachingandefficientindexing.3)LeveragePHP7 Featuresforbettercodeefficiency.4)ImplementCachingStrategiessuc

ToimprovePHPapplicationspeed,followthesesteps:1)EnableopcodecachingwithAPCutoreducescriptexecutiontime.2)ImplementdatabasequerycachingusingPDOtominimizedatabasehits.3)UseHTTP/2tomultiplexrequestsandreduceconnectionoverhead.4)Limitsessionusagebyclosin

Dependency injection (DI) significantly improves the testability of PHP code by explicitly transitive dependencies. 1) DI decoupling classes and specific implementations make testing and maintenance more flexible. 2) Among the three types, the constructor injects explicit expression dependencies to keep the state consistent. 3) Use DI containers to manage complex dependencies to improve code quality and development efficiency.

DatabasequeryoptimizationinPHPinvolvesseveralstrategiestoenhanceperformance.1)Selectonlynecessarycolumnstoreducedatatransfer.2)Useindexingtospeedupdataretrieval.3)Implementquerycachingtostoreresultsoffrequentqueries.4)Utilizepreparedstatementsforeffi

PHPisusedforsendingemailsduetoitsbuilt-inmail()functionandsupportivelibrarieslikePHPMailerandSwiftMailer.1)Usethemail()functionforbasicemails,butithaslimitations.2)EmployPHPMailerforadvancedfeatureslikeHTMLemailsandattachments.3)Improvedeliverability

PHP performance bottlenecks can be solved through the following steps: 1) Use Xdebug or Blackfire for performance analysis to find out the problem; 2) Optimize database queries and use caches, such as APCu; 3) Use efficient functions such as array_filter to optimize array operations; 4) Configure OPcache for bytecode cache; 5) Optimize the front-end, such as reducing HTTP requests and optimizing pictures; 6) Continuously monitor and optimize performance. Through these methods, the performance of PHP applications can be significantly improved.

DependencyInjection(DI)inPHPisadesignpatternthatmanagesandreducesclassdependencies,enhancingcodemodularity,testability,andmaintainability.Itallowspassingdependencieslikedatabaseconnectionstoclassesasparameters,facilitatingeasiertestingandscalability.

CachingimprovesPHPperformancebystoringresultsofcomputationsorqueriesforquickretrieval,reducingserverloadandenhancingresponsetimes.Effectivestrategiesinclude:1)Opcodecaching,whichstorescompiledPHPscriptsinmemorytoskipcompilation;2)DatacachingusingMemc


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