Can a PHP function accept an unlimited number of parameters? [duplicate]

This question already has answers here: PHP function with unlimited number of parameters (8 answers开发者_如何转开发) Closed 1 year ago.

In PHP there are functions like unset() that support any number of parameter we throw at them.

I want to create a similar function that is capable of accepting any number of parameters and process them all.

Any idea, how to do this?

---

In PHP, use the function func_get_args to get all passed arguments.

<?php
function myfunc(){
    $args = func_get_args();
    foreach ($args as $arg)
      echo $arg."/n";
}

myfunc('hello', 'world', '.');
?>

An alternative is to pass an array of variables to your function, so you don't have to work with things like $arg[2]; and instead can use $args['myvar']; or rewmember what order things are passed in. It is also infinitely expandable which means you can add new variables later without having to change what you've already coded.

<?php
function myfunc($args){
    while(list($var, $value)=each($args))
      echo $var.' '.$value."/n";
}

myfunc(array('first'=>'hello', 'second'=>'world', '.'));
?>

---

You can use these functions from within your function scope:

• func_get_arg()
• func_get_args()
• func_num_args()

Some examples:

foreach (func_get_args() as $arg)
{
    // ...
}

---

for ($i = 0, $total = func_num_args(); $i < $total; $i++)
{
    $arg = func_get_arg($i);
}

---

if you have PHP 5.6+ , then you can use

function sum(...$numbers) 

functions.variable-arg-list

---

You will have 3 functions at your disposal to work with this. Have the function declaration like:

function foo()
{
    /* Code here */
}

Functions you can use are as follows

func_num_args() Which returns the amount of arguments that have been passed to the array

func_get_arg($index) Which returns the value of the argument at the specified index

func_get_args() Which returns an array of arguments provided.

---

You can use func_get_args() inside your function to parse any number of passed parameters.

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If you are using PHP 5.6 or later version, argument lists may include the ... token to denote that the function accepts a variable number of arguments. The arguments will be passed into the given variable as an array; Simply Using ... you can access unlimited variable arguments.

for example:

<?php
function sum(...$numbers) {
    $sum = 0;
    foreach ($numbers as $n) {
        $sum += $n;
    }
    return $sum ;
}

echo sum(1, 2, 3, 4, 5);
?>

If you are using PHP version <= 5.5 then you can access unlimited parameterusing the func_num_args(), func_get_arg(), and func_get_args() functions.

---

php7 provides an easy way of passing and catching unlimited parameters to a function by using ellipses right before the parameter name in the function definition. Following is an example demonstrating the same:

<?php
function print_names(...$names){
  foreach($names AS $name) echo "The name is: <b>$name</b>.\n";
}
print_names(
  "Superman",
  "Ironman",
  "Spiderman",
  "HULK",
  "Thor",
  "Captain America",
  "Batman"
);

Credits: http://dwellupper.io/post/5/passing-unlimited-parameters-to-functions-in-php7