PHP经验——获得 得到 PHP版本信息及版本比较

<?php

if (version_compare("5.2", PHP_VERSION, ">")) {
     die("PHP 5.2 or greater is required!!!");
 }

?>

<?php
 if (version_compare(PHP_VERSION, '6.0.0') >= 0) {
     echo 'I am at least PHP version 6.0.0, my version: ' . PHP_VERSION . "\n";
 }
 
 if (version_compare(PHP_VERSION, '5.3.0') >= 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";
 }
 ?>