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If you are new to PHP or just need to refresh your skills, this is the place to start. This series of tutorials will give you the basic knowledge you will need to create a simple PHP website.
PHP is a reflective programming language originally designed for producing dynamic web pages.[1] PHP is used mainly in server-side scripting, but can be used from a command line interface or in standalone graphical applications. Textual User Interfaces can also be created using ncurses.
The default is to build PHP as a CGI program. This creates a command line interpreter, which can be used for CGI processing, or for non-web-related PHP scripting. If you are running a web server PHP has module support for, you should generally go for that solution for performance reasons. However, the CGI version enables users to run different PHP-enabled pages under different user-ids.
| Warning |
By using the CGI setup, your server is open to several possible attacks. Please read our CGI security section to learn how to defend yourself from those attacks. |
As of PHP 4.3.0, some important additions have happened to PHP. A new SAPI named CLI also exists and it has the same name as the CGI binary. What is installed at {PREFIX}/bin/php depends on your configure line and this is described in detail in the manual section named Using PHP from the command line. For further details please read that section of the manual.
If you have built PHP as a CGI program, you may test your build by typing make test. It is always a good idea to test your build. This way you may catch a problem with PHP on your platform early instead of having to struggle with it later.
If you have built PHP 3 as a CGI program, you may benchmark your build by typing make bench. Note that if safe mode is on by default, the benchmark may not be able to finish if it takes longer then the 30 seconds allowed. This is because the set_time_limit() can not be used in safe mode. Use the max_execution_time configuration setting to control this time for your own scripts. make bench ignores the configuration file.
Note: make bench is only available for PHP 3.
Some server supplied
environment variables are not defined in the
current CGI/1.1 specification.
Only the following variables are defined there: AUTH_TYPE,
CONTENT_LENGTH, CONTENT_TYPE,
GATEWAY_INTERFACE, PATH_INFO,
PATH_TRANSLATED, QUERY_STRING,
REMOTE_ADDR, REMOTE_HOST,
REMOTE_IDENT, REMOTE_USER,
REQUEST_METHOD, SCRIPT_NAME,
SERVER_NAME, SERVER_PORT,
SERVER_PROTOCOL, and SERVER_SOFTWARE.
Everything else should be treated as 'vendor extensions'.
Another Useful functions:
transports.unix | streams.php-stream-sock-open-unix | install.unix.sun | install.unix.solaris | install.unix.openbsd | install.unix | install.unix.hpux | install.unix.fhttpd | install.unix.debian | install.unix.commandline | install.unix.caudium | install.unix.apache2 | function.unixtojd | function.jdtounix |
PHP is a widely-used general-purpose scripting language that is especially suited for Web development and can be embedded into HTML. If you are new to PHP and want to get some idea of how it works, try the introductory tutorial. After that, check out the online manual, and the example archive sites and some of the other resources available in the links section.