How to Call a PHP Function with a Variable Number of Arguments?

Call a PHP Function with Variable Number of Arguments

When dealing with PHP functions that accept a variable number of arguments, the number of parameters passed to the function can be determined based on the length of an array. To achieve this, PHP provides several techniques:

call_user_func_array

If the arguments are stored in an array, the call_user_func_array function can be employed. This function accepts an array as its second parameter, which contains the function arguments.

Example:

function test() {
  var_dump(func_num_args());
  var_dump(func_get_args());
}

$params = [
  10,
  'glop',
  'test',
];

call_user_func_array('test', $params);

This code will output:

int 3
array
  0 => int 10
  1 => string 'glop' (length=4)
  2 => string 'test' (length=4)

for Loop

Another option is to use a for loop to iterate over the array and pass each element as an argument to the function.

Example:

function test($num1, $str1, $str2) {
  var_dump(func_get_args());
}

$params = [
  10,
  'glop',
  'test',
];

for ($i = 0; $i < count($params); $i++) {
  test($params[$i]);
}

This code will output:

array(1) {
  [0] => int 10
}
array(1) {
  [0] => string 'glop' (length=4)
}
array(1) {
  [0] => string 'test' (length=4)
}

By utilizing these techniques, you can effectively call PHP functions with a variable number of arguments based on the length of an array.

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