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PHP has hundreds of base functions and thousands more from extensions. Prior to PHP version 5.3.0, functions are not first-class functions and can only be referenced by their name, whereas PHP 5.3.0 introduces closures. [35] User-defined functions can be created at any time and without being prototyped. [35]
The PHP Standard Recommendation (PSR) is a PHP specification published by the PHP Framework Interop Group. Similar to Java Specification Request for Java, it serves the standardization of programming concepts in PHP. The aim is to enable interoperability of components and to provide a common technical basis for implementation of proven concepts ...
As of 21 January 2025 (two months after PHP 8.4's release), PHP is used as the server-side programming language on 75.0% of websites where the language could be determined; PHP 7 is the most used version of the language with 47.1% of websites using PHP being on that version, while 40.6% use PHP 8, 12.2% use PHP 5 and 0.1% use PHP 4. [19]
The newest version is Zend Engine 4, which was developed for PHP 8. The source code for the Zend Engine has been freely available under the Zend Engine License (although some parts are under the PHP License ) since 1999, [ 5 ] as part of the official releases from php.net, as well as the official git repository or the GitHub mirror.
PHPDoc is an adaptation of Javadoc format for the PHP programming language.It is still an informal standard for commenting PHP code, but it is in the process of being formalized. [1]
PHP version: Supports PHP 4 and all PHP 5 thread-safe releases including 5.4. In older releases, the encoder will only work with PHP versions from the 4.x.x branch. eAccelerator will not work with any other versions of PHP. eAccelerator can only be used with the thread-safe version of PHP. Latest stable version: 0.9.6.1 (2010-05-31)
PHPMailer is a code library to send (transport) emails safely [8] and easily via PHP code from a web server (MUA to the MSA server). Sending emails directly by PHP code requires a high-level familiarity to SMTP protocol standards ( RFC 821 , 2821 , 5321 ) and related issues (such as Carriage return ) and vulnerabilities about email injection ...
In the Standard Generalized Markup Language (SGML), an entity is a primitive data type, which associates a string with either a unique alias (such as a user-specified name) or an SGML reserved word (such as #DEFAULT).