Php uses function_exists to check whether a function exists.

This article mainly introduces how to use function_exists to check whether a function exists in php. The example shows how to use function_exists to check whether a function exists and call related techniques in php. It is very useful and requires

This article mainly introduces how to use function_exists to check whether a function exists in php. The example shows how to use function_exists to check whether a function exists and call related techniques in php. It is very useful and requires

This example describes how to use function_exists to check whether a function exists in php. Share it with you for your reference. The specific analysis is as follows:

In php, you can use the function_exists () function to check whether another function exists. You can pass the function name as a string to function_exists to check whether the function exists.

Function highlight ($ txt) {return "$ txt";} function textWrap ($ tag, $ txt, $ func = "") {if (function_exists ($ func )) $ txt = $ func ($ txt); return "<$ tag> $ txt \ N ";}

Example:

Echo textWrap ('I', 'function exists demo', 'highlight'); // function exists Demo in italics

I hope this article will help you with php programming.

,