Getting started with PHP Variables Arrays Functional Programming Types Autoloading Primer Exception Handling and Error Reporting Working with Dates and Time Sending Email Sessions Cookies Classes and Objects Password Hashing Functions Output Buffering JSON SOAP Client Reflection Using cURL in PHP Dependency Injection XML Regular Expressions (regexp/PCRE)Traits Namespaces Parsing HTML Composer Dependency Manager Magic Methods Alternative Syntax for Control Structures File handling Magic Constants Type hinting Multi Threading Extension Filters & Filter Functions Generators Operators Constants UTF-8 URLs Object Serialization PHPDoc Contributing to the PHP Manual String Parsing Loops Control Structures Serialization Closure Reading Request Data Type juggling and Non-Strict Comparison Issues Security PHP MySQLi Command Line Interface (CLI)Localization Debugging Superglobal Variables PHP Unit Testing Variable Scope References Compilation of Errors and Warnings Installing a PHP environment on Windows Datetime Class Headers Manipulation Performance Common Errors Installing on Linux/Unix Environments Contributing to the PHP Core Coding Conventions Using MongoDB Asynchronous programming Using SQLSRV Unicode Support in PHP Functions Create PDF files in PHP How to Detect Client IP Address YAML in PHP Image Processing with GD Multiprocessing SOAP Server Machine learning Cache Streams Array iteration Cryptography PDO SQLite3 Sockets Outputting the Value of a Variable String formatting Compile PHP Extensions mongo-php Manipulating an Array Executing Upon an Array Processing Multiple Arrays Together SPL data structures Comments IMAP Using Redis with PHP Imagick SimpleXML HTTP Authentication Recipes BC Math (Binary Calculator)Docker deployment WebSockets APCu Design Patterns Secure Remeber Me php mysqli affected rows returns 0 when it should return a positive integer PHP Built in server How to break down an URL PSR

Comments

Remarks:

Keep the following tips in mind when deciding how to comment your code:

You should always write your code as if comments didn't exist, using well chosen variable and function names.
Comments are meant to communicate to other human beings, not to repeat what is written in the code.
Various php commenting style guides exist (e.g. pear, zend, etc). Find out which one your company uses and use it consistently!

Single Line Comments

The single line comment begins with "//" or "#". When encountered, all text to the right will be ignored by the PHP interpreter.

// This is a comment

# This is also a comment

echo "Hello World!"; // This is also a comment, beginning where we see "//"

Multi Line Comments

The multi-line comment can be used to comment out large blocks of code. It begins with /* and ends with */.

/* This is a multi-line comment.
   It spans multiple lines.
   This is still part of the comment. 
*/

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