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What's the difference between php 4 and php 5?


Asked by Gabriel Coffey on Dec 09, 2021 PHP



PHP 5 was released 4 years after the introduction of PHP 4 to the Internet scene, aimed to bring a brand new functionality to the PHP language. The PHP team focused on what was missing or not well supported in the older versions.
Besides,
The current PHP 5.X series use Zend Engine II that enhanced the funtionality of the initial engine and adds an extensible object model and a significant performance enhancement to the language. PHP 7 receives a brand new version of the engine coming under the code name of PHP#NG (Next Generation).
Thereof, Currently, there are two PHP versions which are being used, PHP 4 and PHP 5. Even though PHP 4 is no longer developed, there are a lot of scripts still using this older version, due to its proven qualities.
Consequently,
To decide which version is the best for your web application, get in touch with a reliable PHP development company. PHP 5 is the upgraded version of PHP 4 PHP web developers state that PHP 5 is a robust version as compared to other versions. However, it was not able to meet the user’s expectations.
Accordingly,
PHP4 and PHP5 are two versions of PHP. PHP4 was released on May 22, 2000. It was powered by the Zend Engine 1.0. After various versions, the last version of PHP4, titles PHP4.4.9 was released in August 2008. After which it was announced that PHP4 will no longer be under development and no more security updates for the version will be released.