function Assignment Parameter Problem

Such as:
PHP Built-in sprintf () function
Cases:
sprintf ($xml, $a, $b);
I want to insert the parameter $c now, $d
But $c, $d is the data taken out of the array.
$array =array (
Array (contents of ' C '),
Array (contents of ' d '),
)
If I loop out the $array, and then put the parameters is not feasible, what good method?
$str = ";
foreach ($array as $key = = $val) {
$str. = $val [0]. ', ';
}
sprintf ($xml, $a, $b, $str);

Reply to discussion (solution)

There's something wrong with your approach.
For sprintf ($xml, $a, $b);
There are at most 2%s (or other format characters) in the $MXL, otherwise a syntax error will occur
When writing sprintf ($xml, $a, $b, $c, $d); When
4 format characters are required in the $MXL
So, you just think about how to pass a value.

I know the format requirements for sprintf ().
I'm just taking this function out to do an example.
When a function encounters multiple arguments, can there be a way to take a value out of an array, pass it to a function, and pass it as multiple arguments, not one.

Call_user_func_array

Boss Xu, still do not understand my meaning.
I mean:
There is one way:
function Test () {
}
Test ($a, $b);//There may be more parameters later, but this is dynamic and there may be 5 or 6, not necessarily.

So I want to iterate through an array of source arrays:
$array =array (1,2,3,4,5);//I now need to pass the values in the array to test (), which is 5, but it could be 6, 7.
such as: Test ($a, $b, 1,2,3,4,5);
So I'm going to try to pass through the array to the function?
$args = ";
foreach ($array as $key = = $val) {
$args. = $val. ', ';
}
substr ($args, 0,-1);
Test ($a, $b, $args);
But I'm sorry the idea is wrong, because when it passes, it's a parameter, so what do we need to do in the middle?

Call_user_func_array
This method limits too much to death.

I don't know what you want to do, at least you have a problem with the example!
Can you give me a proper example?

I don't know what you want to do, at least you have a problem with the example!
Can you give me a proper example?
There is one way:
Test ($a, $b);//But I want to add more parameters in the back, possibly multiple.
But for the moment, I'm using
$args = "A,b,c";
Test ($a, $b, $args);//This is not feasible because there are only 3 parameters at this time.
The result I want is:
Test ($a, $b, a,b,c);//This is normal, there are 5 parameters, which is what I want.

function test ($a, $b) {  echo ' passed in: '. Join (', ', Func_get_args ());} Test (from); Incoming: 1,2test (1,2,3,4,5);//incoming: 1,2,3,4,5$ar = Array (' A ', ' B ', ' C ', ' d ', ' e ', ' f '); Call_user_func_array (' Test ', $ar);//Incoming : a,b,c,d,e,f

You still don't have an accurate description of what you mean

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