Comparing call_user_func vs call_user_func_array vs call_user_method vs call_user_method_array

Question

function HelloFunc($Arg1 , $Arg2 , $Arg3 ){
    echo "Arg1 : " . $Arg1 . "\n";
    echo "Arg2 : " . $Arg2 . "\n";
    echo "Arg3 : " . $Arg3 . "\n";
    return "done";
}

Comparing Outputs

echo call_user_func("HelloFunc" , "1" , "2" , "3");


Arg1 : 1
Arg2 : 2
Arg3 : 3
done

echo call_user_func_array("HelloFunc" , "1" , "2" , "3"); 

Warning: call_user_func_array() expects exactly 2 parameters

My question is, the best cases to use call_user_func & call_user_func_array

I know call_user_method & call_user_method_array are depreciated and does not work in PHP7. And call_user_func & call_user_func_array do not work in older PHP.

Is that a good idea to relate following to make it compatible with most php version

call_user_method = call_user_func 
call_user_method_array = call_user_func_array

Like :

function_exists('call_user_method ') ? call_user_method() : call_user_func ();

function_exists('call_user_method_array ') ? call_user_method_array () : call_user_func_array();

for call_user_func_array, As the name states that it should an array. So use call_user_func_array('funntion', $arr), For your question echo call_user_func_array("HelloFunc" , array("1" , "2" , "3")); — Murad Hasan
– Murad Hasan, Commented May 30, 2016 at 6:06
@FrayneKonok That's fine. But how does that make difference as same array could be passed to call_user_func along with call_user_func_array. Is that just that call_user_func_array accepts two arguments, & call_user_func accepts many — Johny Pie
– Johny Pie, Commented May 30, 2016 at 6:09
@FrayneKonok which is right to use in terms of efficiency. Why is there extra function call_user_func_array when things could just happen with call_user_func . I think there should be some difference in usage — Johny Pie
– Johny Pie, Commented May 30, 2016 at 6:13

Murad Hasan · Accepted Answer · 2016-05-30 06:40:55Z

3

You can use both call_user_func_array and call_user_func, but depending on your data.

For call_user_func_array, As the name states that it should an array. So use call_user_func_array('funntion', $arr).

For your question echo call_user_func_array("HelloFunc" , array("1" , "2" , "3"));.

How is your HelloFunc function for this:

function HelloFunc($arg1, $arg2, $arg3){

}

More details: function.call-user-func-array.php, function.call-user-func.php

edited May 30, 2016 at 6:40

answered May 30, 2016 at 6:13

Murad Hasan

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13 Comments

Johny Pie Over a year ago

Got this -> Warning: Missing argument 2 for HelloFunc()

Murad Hasan Over a year ago

You need to make your function and also parameter like as you pass from this.

Johny Pie Over a year ago

$arr = array("1" , "2" , "3"); call_user_func_array('funntion', $arr) & call_user_func('funntion', $arr); Do they make any difference ?

Murad Hasan Over a year ago

call_user_func("function_name", 'any_parameter_you_can_pass'); but call_user_function_array('function_name', 'only_array')

Murad Hasan Over a year ago

mixed call_user_func ( callable $callback [, mixed $parameter [, mixed $... ]] ), see the mixed in front of parameter.

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