What does php5.3 mean?

"5.3" refers to the version number of PHP, "5" is the main version number, and "3" is the sub-version number; "php5.3" refers to the third sub-version of the fifth main version of PHP Version. The general form of PHP version number is "Main version number. Sub version number. Stage version number [extended information]", which can be obtained through the constant "PHP_VERSION".

The operating environment of this tutorial: windows7 system, php5.3 version, DELL G3 computer

The general form of the PHP version is "Main version number .Sub version number. Stage version number [extended information]", each component will be displayed.

And "php5.3" refers to the third sub-version of the fifth major version of PHP.

All version numbers of PHP can be viewed through http://mirrors.sohu.com/php/. Here are some versions:

What PHP version is installed on our computer can be obtained by using the built-in predefined constants:

• PHP_VERSION (string)

  The string of the current PHP version, in the form of "major version number. sub-version number. stage version number [extended information]".

• PHP_MAJOR_VERSION (int)

  The major version number of the current PHP version, in the form of an integer (for example: "5.2.7-extra" version is int(5)).

• PHP_MINOR_VERSION (int)

  The sub-version number of the current PHP version, in the form of an integer (for example: "5.2.7-extra" version is int(2)).

• PHP_RELEASE_VERSION (int)

  The stage version number of the current PHP version, in the form of an integer (for example: "5.2.7-extra" version is int(7)).

• PHP_VERSION_ID (int)

  The integer of the current PHP version, used for version comparison (for example: "5.2.7-extra" version is int(50207) ).

• PHP_EXTRA_VERSION (string)

  The "extended information" information of the current PHP version, in the form of a string (for example: "5.2.7- extra" version is '-extra' ). Typically used by distribution vendors to indicate the version of a package.

Example:

<?php
header("Content-type:text/html;charset=utf-8"); 
echo "当前PHP版本信息：".PHP_VERSION."<br>";
echo "当前PHP版本的主版本号：".PHP_MAJOR_VERSION."<br>";
echo "当前PHP版本的子版本号：".PHP_MINOR_VERSION."<br>";
echo "当前PHP版本的阶段版本号：".PHP_RELEASE_VERSION."<br>"; 
?>

Rendering:

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