php calling function dynamically returns null

Question

Im trying to call a function dynamically, using call_user_func_array, but the issue I'm facing is that if the function returns boolean,Parameter variables are stored in an array, but if the function returns a string it will work fine

call_user_func_array() expects parameter 1 to be a valid callback, function 'equal' not found or invalid function name not included in ...

$param = array (
   0 => Jill
   1 => Jack
);

echo call_user_func_array("equal", $param);

function equal($str, $str_2) {
     if ($str==$str_2) {
         return true;
     } else {
         return false;
     }
}

in other place, but calling functions that return a string works well . — meWantToLearn, Aug 22 '12 at 08:07
He meant: Do you include the file contain `equal()` _before_ you call `call_user_func_array()`? — KingCrunch, Aug 22 '12 at 08:09
You say "it will produce an array", but then copy an error message saying that the function could not be found, which would make it return `NULL`, and demonstrate with `echo`, which would be an odd choice for a boolean or an array. Does the code as you've posted it actually reproduce the error for you? — IMSoP, Aug 22 '12 at 08:15
Your `array()` syntax is wrong, but that shouldn't cause this error. Jack and Jill need to be in quotes, and you need a comma between them. — Barmar, Aug 22 '12 at 08:35
@Barmar that's a copy-paste of a print_r it's not meant to reproduce array syntax, just to show you what the array contains. — Mihai Stancu, Aug 22 '12 at 08:38
What do you mean by "parameters are stored in an array"? What is that a `print_r()` of? The input to the function, or the output? — IMSoP, Aug 22 '12 at 13:28
call_user_func_array , requires the parameters to be in an array — meWantToLearn, Aug 22 '12 at 13:50
Yes. That's why it's called call_user_func_ARRAY. RTFM http://php.net/call_user_func_array http://uk.php.net/call_user_func — IMSoP, Aug 22 '12 at 16:45

score 2 · Accepted Answer · answered Aug 22 '12 at 08:20

2

I tried your script. it is working and returning "false". Just use var_dump() instead of echo to test it. And if equal() is returning array then array is also returned. no errors for me.

answered Aug 22 '12 at 08:20

wormhit

3,687
37
46

2

Works for me, too, once I fix the array syntax problems. – Barmar Aug 22 '12 at 08:35

php calling function dynamically returns null

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