We can check built in function or user defined functions before using them. The built in function function_exists checks this and returns true of false. It takes one string input and returns Boolean output. Here is an example.

echo " Yes this funtion is available to use ";
echo " Sorry , this is not available to use " ;

In the above code we have used is_int a built in function in PHP, so we will the output as

Yes this funtion is available to use

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