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Getting Started
Introduction
A simple tutorial
Language Reference
Basic syntax
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Generators
References Explained
Predefined Variables
Predefined Exceptions
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Context options and parameters
Supported Protocols and Wrappers
Security
Introduction
General considerations
Installed as CGI binary
Installed as an Apache module
Filesystem Security
Database Security
Error Reporting
Using Register Globals
User Submitted Data
Magic Quotes
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Features
HTTP authentication with PHP
Cookies
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Dealing with XForms
Handling file uploads
Using remote files
Connection handling
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Safe Mode
Command line usage
Garbage Collection
DTrace Dynamic Tracing
Function Reference
Affecting PHP's Behaviour
Audio Formats Manipulation
Authentication Services
Command Line Specific Extensions
Compression and Archive Extensions
Credit Card Processing
Cryptography Extensions
Database Extensions
Date and Time Related Extensions
File System Related Extensions
Human Language and Character Encoding Support
Image Processing and Generation
Mail Related Extensions
Mathematical Extensions
Non-Text MIME Output
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Windows Only Extensions
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<?php # Every PHP file starts in a kind of "direct output" mode where # any content is sent straight to the user. # # To use "PHP" code we must first enter the PHP context by using the # <?php opening tag. # In PHP mode we write output using "Echo" echo "Hello World!"; echo PHP_EOL . PHP_EOL; # In PHP, variables are declared by using the $ prefix $name = "Joe Blogs"; echo "Your name is: " . $name; echo PHP_EOL . PHP_EOL; # PHP uses `.` to concatenate variables as strings. # This may be different to languages where you may expect to use `+`. # This is to ensure there can be no mix-up between # addition and concatenating echo "Concatenation: " . ("1" . "1") . PHP_EOL; echo "Addition: " . ("1" + "1") . PHP_EOL; echo PHP_EOL; # Here we will perform a basic for loop $max_loops = 5; for ($i = 0; $i < $max_loops; $i++) { echo "Loop " . ($i + 1) . PHP_EOL; } echo PHP_EOL;
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