How to get the current PHP version number using phpversion()?

In PHP development, it is a very common and important requirement to understand the PHP version number of the current server. The functionality and syntax supported by different PHP versions may vary, so getting version information accurately helps write code with better compatibility. PHP provides a very simple and easy-to-use built-in function - phpversion() , which can help us easily obtain the PHP version number of the current server.

Introduction to phpversion() function

The phpversion() function is used to return the version number of the currently installed PHP parser. It is very simple to use, and you can return the version string without passing in any parameters.

Basic usage

 <?php
echo 'currentPHPVersion is：' . phpversion();
?>

After the above code is executed, the following will be output:

 currentPHPVersion is：8.1.3

This is the PHP version installed on the current server.

Advanced use

The phpversion() function also supports passing an optional parameter to query a specific extension version number. For example, if we want to know the version number of the curl extension, we can write it like this:

 <?php
echo 'Curl扩展Version is：' . phpversion('curl');
?>

However, this usage requires corresponding extension support, and not all extensions will return version numbers.

Use with other information

If you want to display PHP version information in more detail, the commonly used phpinfo() function can also be called, but it will output a large amount of detailed PHP configuration content, which is not suitable for scenarios where a simple version number is obtained.

If you just want to quickly detect versions, phpversion() is definitely the lightest and convenient option.

Summarize

• The phpversion() function is simple to call, and you can get the current PHP version number without parameters.

• By passing in the extension parameter, you can query the version number of a specific extension.

• For simple version number detection, phpversion() is recommended.

Mastering the phpversion() function can help you quickly understand the server environment and write more compatible and robust PHP code.

 <?php
// Simple example：获取currentPHPVersion number
echo 'currentPHPVersion is：' . phpversion();

// 获取特定扩展Version number示例
// echo 'MySQLi扩展Version is：' . phpversion('mysqli');
?>