http://blog.csdn.net/morewindows/article/details/7102362
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

php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($number))”;2、利用“~”位运算符将负数取反加一,语法“~$number + 1”。

实现方法:1、使用“sleep(延迟秒数)”语句,可延迟执行函数若干秒;2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句,可延迟执行函数若干秒和纳秒;3、使用“time_sleep_until(time()+7)”语句。

php除以100保留两位小数的方法:1、利用“/”运算符进行除法运算,语法“数值 / 100”;2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值,并保留两位小数。

判断方法:1、使用“strtotime("年-月-日")”语句将给定的年月日转换为时间戳格式;2、用“date("z",时间戳)+1”语句计算指定时间戳是一年的第几天。date()返回的天数是从0开始计算的,因此真实天数需要在此基础上加1。

php判断有没有小数点的方法:1、使用“strpos(数字字符串,'.')”语法,如果返回小数点在字符串中第一次出现的位置,则有小数点;2、使用“strrpos(数字字符串,'.')”语句,如果返回小数点在字符串中最后一次出现的位置,则有。

php字符串有下标。在PHP中,下标不仅可以应用于数组和对象,还可应用于字符串,利用字符串的下标和中括号“[]”可以访问指定索引位置的字符,并对该字符进行读写,语法“字符串名[下标值]”;字符串的下标值(索引值)只能是整数类型,起始值为0。

方法:1、用“str_replace(" ","其他字符",$str)”语句,可将nbsp符替换为其他字符;2、用“preg_replace("/(\s|\ \;||\xc2\xa0)/","其他字符",$str)”语句。

查找方法:1、用strpos(),语法“strpos("字符串值","查找子串")+1”;2、用stripos(),语法“strpos("字符串值","查找子串")+1”。因为字符串是从0开始计数的,因此两个函数获取的位置需要进行加1处理。


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