php func_get

php func_get_arg

mixed func_get_arg ( int $arg_num )

该函数用于返回所在函数中指定索引的参数，索引从0开始

 1 <?php
 2 function foo()
 3 {
 4      $numargs = func_num_args();
 5      echo "Number of arguments: $numargs<br />\n";
 6      if ($numargs >= 2) {
 7          echo "Second argument is: " . func_get_arg(1) . "<br />\n";
 8      }
 9 }
10 
11 foo (1, 2, 3);
12 ?>

array func_get_args ( void )

则将所有参数以数组形式返回

 1 <?php
 2 function foo() {
 3     include './fga.inc';
 4 }
 5 
 6 foo('First arg', 'Second arg');
 7 ?>
 8 
 9 fga.inc
10 <?php
11 
12 $args = func_get_args();
13 var_export($args);
14 
15 
16 //print : array (
17 //                   0 => 'First arg',
18 //                   1 => 'Second arg',
19 //                 )
20 
21 ?>

int func_num_args ( void )

返回函数参数的总数

 1 <?php
 2 function foo()
 3 {
 4     $numargs = func_num_args();
 5     echo "Number of arguments: $numargs\n";
 6 }
 7 
 8 foo(1, 2, 3);   
 9 
10 //print : Number of arguments: 3
11 ?>