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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]
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.
PHP supports standard C/C++ style comments, but supports Perl style as well. Python The use of the triple-quotes to comment-out lines of source, does not actually form a comment. [ 19 ]
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The nXhtml addon has special support for PHP (and other template languages). The major mode web-mode.el is designed for editing mixed HTML templates. Geany – syntax highlighting for HTML + PHP. Provides PHP function list. jEdit – free/open source editor. Supports SFTP and FTP. Komodo Edit – general purpose scripting language editor with ...
Twig is a template engine for the PHP programming language. Its syntax originates from Jinja and Django templates. [3] It's an open source product [4] licensed under a BSD License and maintained by Fabien Potencier. The initial version was created by Armin Ronacher.
SELECT isbn, title, price FROM Book WHERE price < (SELECT AVG (price) FROM Book) ORDER BY title; A subquery can use values from the outer query, in which case it is known as a correlated subquery . Since 1999 the SQL standard allows WITH clauses, i.e. named subqueries often called common table expressions (named and designed after the IBM DB2 ...
Sin taxes are often assessed at a flat rate meaning they account for a much larger portion of the price of an x by the wealthy. Also, sin tax rates products such as alcohol or cigarettes typically do not account for ability to pay, therefore poor people pay a much greater share of their income as tax. [18] [19]