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PHP Reserved Words - PHP Keywords

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Also called: PHP Language Keywords, PHP Reserved Keywords, PHP Keywords, PHP Reserved Identifiers, PHP Reserved words

Provide a list of Reserved Words in PHP. Answer in MediaWiki syntax with the URL of the official documentation for each language reference.

Provide a list of Reserved Words in PHP with a brief description of each. Answer in MediaWiki syntax.

https://www.php.net/manual/en/reserved.keywords.php

Here's a list of Reserved Words in PHP along with brief descriptions:

Reserved Words in PHP

__halt_compiler() - Halts the compiler execution.
abstract - Used to declare abstract classes and methods.
and - Logical operator, same as '&&'.
array - Used to create an array.
as - Used in foreach loops to iterate through arrays.
break - Used to exit a loop or switch statement.
callable - Used to determine if a variable can be called as a function.
case - Used in switch statements to define different cases.
catch - Used to handle exceptions.
class - Used to declare a class.
clone - Used to create a copy of an object.
const - Used to define constants.
continue - Used to skip the rest of the current loop iteration.
declare - Used to set execution directives.
default - Used in switch statements as a default case.
die() - Equivalent to exit().
do - Used to start a do-while loop.
echo - Used to output one or more strings.
else - Used with if to execute a block of code if the condition is false.
elseif - Used with if to execute a block of code if the previous conditions are false.
empty() - Used to determine if a variable is empty.
enddeclare - Used to end a declare block.
endfor - Used to end a for loop.
endforeach - Used to end a foreach loop.
endif - Used to end an if block.
endswitch - Used to end a switch block.
endwhile - Used to end a while loop.
eval() - Evaluates a string as PHP code.
exit() - Terminates the script execution.
extends - Used to declare a class that inherits from another class.
final - Used to prevent a class from being inherited or a method from being overridden.
finally - Used with try-catch to execute code after try and catch blocks.
for - Used to start a for loop.
foreach - Used to iterate over arrays.
function - Used to declare a function.
global - Used to access a global variable from within a function.
goto - Used to jump to another section of the program.
if - Used to execute a block of code if a condition is true.
implements - Used to implement an interface.
include - Used to include and evaluate a specified file.
include_once - Used to include and evaluate a specified file only once.
instanceof - Used to determine if an object is an instance of a specific class.
insteadof - Used in namespaces to resolve naming conflicts.
interface - Used to declare an interface.
isset() - Used to determine if a variable is set and is not NULL.
list() - Assigns variables as if they were an array.
namespace - Used to declare namespaces.
new - Used to instantiate a new object.
or - Logical operator, same as '||'.
print - Used to output one or more strings.
private - Access modifier, restricts access to class members to within the class itself.
protected - Access modifier, restricts access to class members to within the class itself and its subclasses.
public - Access modifier, allows access to class members from outside the class.
require - Used to include and evaluate a specified file.
require_once - Used to include and evaluate a specified file only once.
return - Used to return a value from a function.
static - Used to declare static properties and methods.
switch - Used to select one of many blocks of code to be executed.
throw - Used to throw exceptions.
trait - Used to declare traits.
try - Used to start a try-catch block.
unset() - Used to unset a variable or an element within an array.
use - Used to import namespaces or traits.
var - Declares a variable in a class.
while - Used to start a while loop.
xor - Logical operator, exclusive OR.
yield - Used to return a value from a generator function.
yield from - Delegates to another generator.

This list covers all the reserved words in PHP along with brief descriptions of each.

Snippet from Wikipedia: PHP: PHP is a general-purpose scripting language geared towards web development. It was originally created by Danish-Canadian programmer Rasmus Lerdorf in 1993 and released in 1995. The PHP reference implementation is now produced by the PHP Group. PHP was originally an abbreviation of Personal Home Page, but it now stands for the recursive initialism PHP: Hypertext Preprocessor.
PHP code is usually processed on a web server by a PHP interpreter implemented as a module, a daemon or a Common Gateway Interface (CGI) executable. On a web server, the result of the interpreted and executed PHP code—which may be any type of data, such as generated HTML or binary image data—would form the whole or part of an HTTP response. Various web template systems, web content management systems, and web frameworks exist that can be employed to orchestrate or facilitate the generation of that response. Additionally, PHP can be used for many programming tasks outside the web context, such as standalone graphical applications and drone control. PHP code can also be directly executed from the command line.
The standard PHP interpreter, powered by the Zend Engine, is free software released under the PHP License. PHP has been widely ported and can be deployed on most web servers on a variety of operating systems and platforms.
The PHP language has evolved without a written formal specification or standard, with the original implementation acting as the de facto standard that other implementations aimed to follow.
W3Techs reports that as of 23 March 2024 (the four months after the PHP 8.3 release), PHP is used by 76.4% of all websites whose programming language could be determined, and 57.2% thereof use PHP 7 which is outdated and known to be insecure. Additionally, PHP 8.0 is no longer supported, meaning the vast majority of PHP users utilize outdated versions, and well over half of all websites, PHP-using or not (whose programming language could be determined) are insecure.

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