PHP experience-obtain PHP version information and version Comparison

I accidentally saw a sentence written by someone else.Code:

 
<?PHPIf(Version_compare("1, 5.2 ",Php_version, ">")){Die("Php 5.2 or greater is required !!! ");}?>
 

It turns out that retrieving PHP version information is so simple ~~~

Php_version is a constant that can obtain the PHP version information.

Version_compare is a version comparison tool. It can also be used as a comparison tool for other versions:

<? PHP  If ( Version_compare ( Php_version , '6. 100')> = 0 ){ Echo 'I am at least PhP Version 6.0.0, my version :'. Php_version . "\ N" ;}  If ( Version_compare ( Php_version , '5. 100')> = 0 ){  Echo 'I am at least PhP version 5.3.0, my version :'. Php_version . "\ N" ;}  If ( Version_compare (Php_version , '5. 0.0 ','> =' )){  Echo 'I am using PHP 5, my version :'. Php_version . "\ N" ;}  If ( Version_compare ( Php_version , '5. 0.0 ',' <' )){  Echo 'I am using PHP 4, my version :'. Php_version . "\ N" ;} ?>