Function analysis of php common function processing

This article will explain the function analysis of commonly used functions in PHP.

func_get_arg — Returns an item in the parameter list

func_get_args — Returns an array containing the function parameter list

func_num_args — Returns the number of parameters passed to the function

call_user_func — Call the first parameter as the callback function

call_user_func_array — Call the callback function and pass an array parameter as the parameter of the callback function

forward_static_call_array — Call a static method and pass the arguments as array

forward_static_call — Call a static method and pass the arguments as an array

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1.

func_get_arg、func_get_arg、func_num_args
class test{
  public function hello($a,$b,$c,$d){
   $num=func_num_args();
   echo "方法参数的个数为：".$num,"
";
   if(2<=$num){
    echo "方法的第三个参数为：".func_get_arg(2)."
";  
   }
   $num2=func_get_args();
   for($i=0;$i<$num;$i++){
       echo "第{$i}个参数为{$num2[$i]}"."
";   
   }
 }
}
$T=new test();
$T->hello(&#39;A&#39;,&#39;B&#39;,&#39;C&#39;,&#39;D&#39;);
//方法参数的个数为：4
//方法的第三个参数为：C
//第0个参数为A
//第1个参数为B
//第2个参数为C
//第3个参数为D

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