Where can I find PHP function version compatibility standards?

The best place to get PHP function version compatibility: PHP Official Documentation PHP Manual PHP Version Comparison Tool Composer Package

##PHP Function Version Compatibility: Ultimate Guide

The best place to look for PHP function version compatibility:

• PHP Official Documentation: This site provides information about each PHP function Detailed version information, including new functions, deprecated functions, and incompatible changes.
• PHP Manual: The PHP Manual contains detailed documentation of functions, including their compatibility information.
• PHP Version Comparison Tools: These tools allow you to compare function compatibility in different PHP versions, such as PHP Compatibility Checker.
• Composer Package: Composer is a dependency manager that helps you manage dependencies and versions of your PHP projects, including supported versions of PHP libraries.

Practical case:

PDO class is undefined and is only available starting with PHP 5.4. In this case, you need to check application compatibility and upgrade to PHP 5.4 or higher.

Other resources:

[PHP Deprecated Function List](https://www.php.net/manual/en/migration55.deprecated. php)
• [PHP Version Comparator](https://www.phpcompatibility.com/)
• [Composer Documentation](https://getcomposer.org/)

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