Variable Length Argument Function

Ø       func_num_args

• This function returns the number of argument passed into the current user defined function. The return type is integer.
• Func_num_args() will generates a warning if called from outside of a user defined function.

Syntax

                        int func_num_args(void)

Example

<?php

          function callme()

          {

                   $value = func_num_args();

                   echo "Number of arguments : ".$value;

          }

          callme(1,2,3,4);

          ?>

Output  

                   Number of arguments : 4

Ø       func_get_arg

• Returns an item from the argument list.

Syntax

                        mixed func_get_arg(int arg_num)

• Returns the argument which is at the arg_num’th offset into a user-defined function’s argument list.
• Function argument are counted starting from zero.
• Func_get_arg() will generates a warning if called from outside of a function definition. This function cannot be used directly as a function parameter instead, its result may be assigned to a variable, which can then be passed to the function.

Example

<?php

          function callme()

          {

                   $num_arg = func_num_args();

                   echo "Number of arguments : ".$num_arg."<br/>";

                   if($num_arg >= 2)

                   {

                             echo "Seccond arguments is : ".func_get_arg(1);

                   }

          }

          callme(1,2,3,4);

          ?>

Output  

                   Number of arguments : 4

                   Seccond arguments is : 2

Ø       func_get_args

• Returns the array of arguments passed into the current user defined function.

Syntax

                        array func_get_args(void)

Example

<?php

          function callme()

          {

                   $num_args = func_num_args();

                   if($num_args > 0)

                   {

                             $num = func_get_args();

                             foreach($num as $value)

                             {

                                      echo $value."<br/>";

                             }

                   }

          }

          callme("Hello","World");

          ?>

Output  

                   Hello

                   World

Posted By : Hemangi Zala