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An alternative to CGI scripts, which are stored in separate files on the web server, are embedded scripts, which are stored in your web pages One of the most popular languages for embedded server scripts is PHP
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PHP (which stands for PHP Hypertext Preprocessor) is an open source programming language similar to Perl It is most often used with the open source Apache web server on Linux and other UNIX-like systems, but PHP can also be used with nearly every UNIX, Mac, and Windows web server including Netscape iPlanet, Microsoft IIS, and dozens of others PHP is estimated to be installed on over 20 percent of all web servers Embedded PHP scripts provide nearly all of the power of CGI scripts but are much easier to write and use You can upload web pages with embedded PHP the same way that you upload regular web pages, except that the names of the pages end with php or phtml rather than html (The exact naming convention is up to the manager of the web server)
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Embedded PHP resembles HTML tags, but is handled on the server, before the page is sent to the user s browser Here s a sample PHP script that sends different text on Sundays than other days:
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< php $day = date("w"); /* Store numeric weekday in $day / if($day == 0): /* 0 is Sunday */
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> HTML code for Sunday < php else: > HTML code for other days < php endif; >
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PHP code is enclosed between < php and > You can and usually do intermix PHP code and HTML in a web page Before the web server sends the page out to the user s browser, the server interprets the PHP code, replacing the PHP scripts with the results of the scripts The version of the web page that arrives at the browser no longer contains any PHP code and contains only the HTML code for the appropriate day PHP includes an extensive library of built-in routines that do everything from string processing to database management to building GIF and PDF documents on-the-fly The database libraries are used extensively to create database-backed web sites, with the contents of web pages created dynamically from databases PHP has built-in support to connect to most popular databases including Informix, Interbase, Microsoft s SQL Server, MySQL, Oracle, and many other databases that support ODBC PHP also handles parameters from both GET and POST, just like CGI scripts PHP automatically interprets named parameters and puts the parameter values into PHP variables Assume this line appeared in a PHP web page called mypagephp:
The square root of < php print $N; > is < php print sqrt($N); >
If you request the page by clicking a link with a URL like this:
http://myserver/mypagephp N=3
the value 3 is assigned to the variable $N, and the line of the web page becomes
The square root of 3 is 17320508075689
(The print operator prints to the web page being sent to the browser) PHP can also read the text in a URL after the name of the web page This feature enables it to do tricks like the ones in our web page at netguruscom/scalephtml/ 500/bishbashjpg The PHP code in the file scalephtml takes a number of pixels (500, in this URL) and the name of an image file (bishbashjpg) from the URL and generates a web page on-the-fly, showing that image scaled to the given width If you change the 500 to any other number, you see a page displaying the image at that size The PHP code gives the effect of a folder with an unlimited number of pages showing images at various sizes This URL shows a different image (maidmistjpg) at a different size (400 pixels wide): netguruscom/ scalephtml/400/maidmistjpg
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Forms, Interactivity, and Database-Driven Web Sites
Getting Prewritten PHP Scripts
Many people have written entire applications in PHP with databases, such as calendars and online stores with shopping carts Many of these applications are freely available on the Web You can also find libraries of PHP code that you can include in applications you write Here are places to look for PHP scripts and general information about PHP: I The PHP Home Page (wwwphpnet) This site contains a huge amount of information, but a good place to start is the tutorial at wwwphpnet/tutphp I The PHP Resource Index (phpresourceindexcom) This site lists hundreds of scripts, libraries, documentation, and other material
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