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This article mainly introduces what php5.3 means. It is very detailed and has certain reference value. Friends who are interested must finish reading it.

"3. 3" refers to the version number of php, "5" is the major version number, "3" is the child version number, and "php5.3" refers to the third child version of the fifth major version of PHP. The general form of the PHP version number is "major version number. Sub-version number. Phase version number [extension Information]", which can be obtained by the constant "PHP_VERSION".

Operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

The general form of the PHP version is "major version number. Sub-version number. Phase version number [extension Information]", each component will be displayed.

And "php5.3" refers to the third child 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 for the current PHP version, in the form of "major version number. Child version number. Phase version number [extension information]".

PHP_MAJOR_VERSION (int)

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

PHP_MINOR_VERSION (int)

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

PHP_RELEASE_VERSION (int)

The phase version number of the current PHP version, in the form of integers (for example, the "5.2.7-extra" version is int (7)).

PHP_VERSION_ID (int)

An integer for the current PHP version for version comparison (for example, the "5.2.7-extra" version is int (50207)).

PHP_EXTRA_VERSION (string)

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

Example:

Effect picture:

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