Question

How to check function has been defined (function exist) in PHP

Answer 1

function recursion_print_1_to_20($a)
{
    if ($a <= 20) 
    {
        echo "$a ";
        recursion_print_1_to_20($a + 1);
    }
}

if (function_exists('recursion_print_1_to_20')) 
    echo "recursion_print_1_to_20 exist <br />";
else 
    echo "recursion_print_1_to_20 not exist <br />";



/*
run:

recursion_print_1_to_20 exist  

*/

 

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