PHP version judgment version_compare() function, phpversion_compare_PHP tutorial

PHP version judgment version_compare() function, phpversion_compare

Brief search in Du Niang to determine whether the current PHP version is higher than a certain version, or lower than a certain version A version of the method

The displayed results are basically the same. Well, if I hadn’t forgotten the version_compare() function, I wouldn’t have gone to Du Niang and decided to look for the previous code

This is how the version_compare() function is described in the PHP manual:

version_compare() is used to compare two "PHP normalized" version number strings. This is helpful for writing programs that are only compatible with certain versions of PHP

mixed version_compare ( string $version1 , string $version2 [, string $operator ] )

Return to hybrid

string $version1 - version 1 required

string $version2 - version 2 required

string $operator - understand it as an operator. Optional

That is, <, lt, <=, le, >, gt, >=, ge, ==, =, eq, !=, <> and ne.

If the third parameter is specified, boolean will be returned. If the third parameter is not specified, the following three situations will be returned:

When the first version is lower than the second version return -1

When the first version is equal to the second version, return 0

When the first version is smaller than the second version, return 1

<?php
header('content-type:text/html;charset=utf-8');
/**
 * 判断php的版本是否在5.3.0以上
 */

echo '<pre class="brush:php;toolbar:false">';
 
//本人使用的版本为  5.2.17
echo 'PHP的当前版本为 '.PHP_VERSION."\n";

var_dump(version_compare(PHP_VERSION,'5.2.0'));

var_dump(version_compare(PHP_VERSION,'5.2.0','='));

var_dump(version_compare(PHP_VERSION,'5.3.0','ge'));

if(version_compare(PHP_VERSION,'5.3.0','ge')){

	echo '您的PHP版本大于5.3.0,当前版本为 '.PHP_VERSION;

}else{

	echo '您的PHP版本小于5.3.0,当前版本为 '.PHP_VERSION;

}

The results are as follows:

PHP的当前版本为 <span>5.2</span>.<span>17</span><span>
int(</span><span>1</span><span>)
bool(</span><span>false</span><span>)
bool(</span><span>false</span><span>)
您的PHP版本小于5.</span><span>3.0</span>,当前版本为 <span>5.2</span>.<span>17</span>