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By Luo Xuan
PHP
Foreword
• Some may have learned
What is PHP?• “PHP: Hypertext Preprocessor” ，超文本预处理语言
• Personal Home Page Tools (PHP Tools) ——Rasmus Lerdorf
• a widely used open-source general-purpose scripting language
• especially suited for web development • can be embedded into HTML
Usage
• Server-side scripting• Eg.– Collect form data– Generate dynamic page content– Send and receive cookies.
Dynamic Web Page• What is Dynamic Web Page?– Dynamic web pages are web sites that are generated at
the time of access by a user or change as a result of interaction with the user.
----Wikipedia
• Why Dynamic Web Page Popular?– Static: few changes and web pages– Dynamic: automatically build and renew web pages
according to the databases, i.e. only changes to the databases needed.
Language Feature in Details
• Embedded in Html• Easy Type• Easy String• Easy Array• Easy Form• Easy E-mail
Embedded in HTML• <html>
<head> <title>PHP Tes</title>
</head><body>
//<?php…?><?php echo "<p>Hello World</p>"; ?>
</body></html>
Easy Type• <?php
$txt = "Hello World!"; $number = 16;?>
• No need for type declaration• Automatic type assignment
Loose Type
Easy String• “.”• <?php
$txt1="Hello World"; $txt2="1234“; echo $txt1 . " " . $txt2; ?>
• <=>“$txt1 $txt2”
• <?php echo strpos("Hello world!","world"); ?>
• <?php echo strlen("Hello world!"); ?>
Hello World 1234
6
12
Easy Array• $names = array("Peter","Quagmire","Joe");
• $ages = array("Peter"=>32, "Quagmire"=>30, "Joe"=>34);
$ages['Peter'] = "32"; $ages['Quagmire'] = "30";$ages['Joe'] = "34";
• foreach
Easy Array
echo "Is " . $families['Griffin'][2] . " a part of the Griffin family?";
Is Megan a part of the Griffin family?
Easy Form//blabla.php //welcome.php
Easy E-mail
Opponents
• ASP• ASP.NET• JSP
FeaturesPros• Multi-platform: Unix ， GUN/Linux,Windows• Easy to learn• Style: Java + C• Speed
– Memory Arrangement
• Embedded into html• Open source:
– Developing– Security
• The Language itself can be modified
– Various functions– Support almost all the databases– Zero Cost
Cons• not suitable for large-scale E-business sites, better for smaller ones• Open Source => different interfaces to different databases
Summary• Very Easy to Learn• “ 如果您需要运行一个具有动态内容、数据库交
互和电子贸易的网站，那么就请继续读下去，因为 PHP 在这方面确实是非常有用的。”
