func_num_args

Just a note for anyone wondering. This function doesn't include params that have a default value, unless you pass one in to overwrite the default param value. Not sure if that makes sense, so here's an example:

<?php
function helloWorld($ArgA, $ArgB="HelloWorld!") {
  return func_num_args();
}

// The following will return 1
$Returns1 = helloWorld("HelloWorld!");

// The following will return 2
$Returns2 = helloWorld("HelloWorld!", "HowdyWorld!");
?>

This function comes in handy, and I believe is the only solution, when you have an optional parameter that can take any type of data.For example:<?php// $data can be of any type, including nullfunction my_function($name, $data = null){    if ($data !== null)    {        // Do something with $data        // If you call my_function('something'), this WILL NOT be reached        // If you call my_function('something', null), this WILL NOT be reached    }}?>The problem with the above function is that you will never be able to use null as the value for $data.  To fix this, use func_num_args() like so:<?php// $data can be of any type, including nullfunction my_function($name, $data = null){    if (func_num_args() >= 2)    {        // Do something with $data        // If you call my_function('something'), this WILL NOT be reached        // If you call my_function('something', null), this WILL be reached    }}?>This solution works because func_num_args() reports exactly how many arguments were passed when the function was called.  It does not take into account when default argument values are used.

I had defined a function function_name(){ ...} as a drupal callback.I try to get how many params where passedI got a Error and my Site falls downI've replaced func_get_args() instead func_num_args() and my Site was restored.I conclude you can not use  func_num_args() in callbacks.Hope it helps.

The idea of func_get_args() is to construct functions of variable number of parameters like

<?php
function var_param_func(){
    if(func_num_args()==0){
        //do one thing
    }
    if(func_num_args()==1)
        //do another thing
        //get the args with func_get_args()
    }
}
?>

If you want to pass the parameters on intact to another function, use func_get_args and call_user_func_array (careful - this one is only available in recent PHP versions).  For example:

<?php
/* Print an HTML tag.  This accepts a variable number of arguments:
   the first should be the name of the tag, followed by pairs of
   arguments that describe keys and values.  The values are printed
   with surrounding double quote characters.  */
function printTag() {
  $numArgs = func_num_args();
  if ($numArgs < 1) die("printTag given no arguments");
  
  echo "<" . func_get_arg(0);
  for ($i = 1; $i < $numArgs; $i+=2) {
    echo " " . func_get_arg($i);
    if ($i+1 < $numArgs)
      echo "=\"" . func_get_arg($i+1) . "\"";
  }
  echo ">";
  
}

/* Print an HTML tag with a newline on the end */
function printTagNL() {
  $args = func_get_args();
  call_user_func_array("printTag", $args);
  echo "\n";
}

printTagNL("input", "type", "hidden", "name", "SORTORDER", "value", $columnNo);
?>

If you are using PHP 7 and func_num_args is in your base class which you extended, you can pass your arguments with the 'spat' operator.class Sql {public function doGetWhere(...$args) {$num_args = func_num_args();      $args_list = func_get_args();      echo '<pre>';      var_dump($args_list);      echo '<pre>';  }}class Member extends Sql {public function getWhere(...$args) {   $this->doGetWhere(...$args);      }}$member = new Member();$member->getWhere('first_name','last_name','userlevel','email','where','email','=',$sub_email);However, take note that if you 'new up' the 'Sql' class in your 'Member' class above, instead of extending it, you will not need to pass your arguments as a variable. Just my two cents. -Bruce tong