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In this article, the editor introduces in detail "php how to judge the existence of the class", detailed content, clear steps, and proper handling of the details. I hope that this "php how to judge the existence of the class" article can help you solve your doubts.

In php, you can use the class_exists () function to determine whether a specified class exists, which checks whether the class is defined, with the syntax "class_exists ('class name')", and returns true if the specified class is defined (exists), or false otherwise.

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

In php, you can use the class_exists () function to determine whether a specified class exists.

The class_exists () function checks whether the specified class is defined.

Syntax:

Class_exists (string $class, bool $autoload = true): bool

Class: class name. Name matching is not partitioned in case.

Autoload: whether to call _ _ autoload by default.

Return value:

This function returns true if the class referred to by class is already defined, otherwise it returns false.

Example 1: check whether the class HelloWorld is defined

Class_exists () will try to call _ autoload by default, and if you don't want class_exists () to call _ autoload, you can set the autoload parameter to FALSE.

Example 2:autoload parameters example

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