Question

I’m trying to create functions dynamically with eval(). But I get this warning: Notice: Use of undefined constant Any suggestion?

$funcs = array('func_a', 'func_b', 'func_c');
foreach($funcs as $func_name) {
    eval( 'function ' . $func_name . '() { 
            mainfunc(' . $func_name . '); 
        }' 
    );  
}

func_a();
func_b();
func_c();

function mainfunc($func_name) {
    echo $func_name . '<br />';
}

Assuming the array $func is an option value stored in a database and I need the function names for a callback function in a separate part of the script. So creating anonymous functions with create_function() is not what I’m looking for.

Thanks for your info.

Answer 1

Your eval body needs to read:

mainfunc(\'' . $func_name . '\'); 

Without the single quotes, eval() makes code that has an unquoted literal–an undefined constant.