How to set PHP version in code

When doing PHP development, choosing the correct PHP version is crucial to the correctness, performance, and security of your program. Therefore, we should understand how to set the PHP version in the code to ensure that the code runs properly.

Here's how to set the PHP version in code:

1. Set it in the .htaccess file

If you are using an Apache server, you The PHP version can be set in the .htaccess file in the root directory of the website. Here is the sample code to set the PHP version:

AddHandler application/x-httpd-php56 .php

In the above example, we set the PHP version to 5.6. You can replace ".php56" with the PHP version you want to use.

2. Set in the php.ini file

Another way to set the PHP version is to set it in the php.ini file. You can find the location of the file with the following command:

php -i | grep php.ini

After opening the php.ini file, you can add or modify between [PHP] The following lines:

cgi.fix_pathinfo = 0
cgi.force_redirect = 0
cgi.redirect_status_env = "no"
engine = On
short_open_tag = Off
asp_tags = Off

In the above code, you should ensure that the three parameters engine, short_open_tag and asp_tags are set to On, Off and Off. This ensures consistent behavior of PHP between different versions.

3. Set in code

You can also set the PHP version in code. Here is an example:

if (version_compare(phpversion(), '5.6.0', '<')) {

die('您的 PHP 版本太低了。请升级到 PHP 5.6 或更高版本。');

}
?>

In the above example, we use the version_compare function to compare PHP versions, and if the version is lower than 5.6, the program will be terminated and an error message will be displayed.

Conclusion

When doing PHP development, setting the correct PHP version is crucial. The above methods can help us set the PHP version in the code to ensure the correctness, performance and security of the code.

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