Alternative method of PHP function overloading-detailed explanation of pseudo-overloading, detailed explanation of overloading_PHP tutorial

An alternative to function overloading in PHP - pseudo-overloading, detailed explanation of overloading

An alternative to function overloading - pseudo-overloading, let’s look at a specific example code .

<&#63; php
//函数重载的替代方法-伪重载
//
//确实，在PHP中没有函数重载这个概念，让很多时候我们无法进行一些处理，甚至有时候不得不在函数后面定义好N个参数
//在看到了func_get_arg,func_get_args,func_num_args,这三个函数的时候，你们是不是想起了什么？

function testOne ( $a ) {
 echo (' 一个参数就这样 ');
}

function testTwo ( $a ,  $b ){
 echo (' 两个参数的就这样 ');
}

function testThree ($a,  $b,  $c ) {
 echo (' 黑黑，这是三个参数的 ');
}

function test () {
 $argNum  =  func_num_args ();
  // 这一段其实可以用 $_arg = func_get_args() 来获得所有的参数，只是要用数组而已，不方便我下面的表达，呵呵
 for ( $i  =  0 ; $i  <  $argNum ; $i ++ ) {
  $_arg_ { $i } =  func_get_arg ( $i );
 }
 switch ( $argNum ) {
  case  1 :
   testOne( $_arg_1 );
   break ;
  case  2 :
   testTwo( $_arg_1,  $_arg_2 );
   break ;
  case  3 :
   testThree( $_arg_1,  $_arg_2,  $_arg_3 );
   break ;
  default :
   echo ( ' 这是没有参数的情况 ' );
   break ;
 }
}
test();
echo ( ' ' );
test( 1 );
echo ( ' ' );
test( 1 , 2 );
echo ( ' ' );
test( 1 , 2 , 3 );

// 这些只是在函数中的运用，其实最主要的还是在类中的运用
//如果这些用到类里面我就不需要担心构造函数是否有几个参数了，不是吗？

class test {
 var  $a  =  0 ;
 var  $b  =  0 ;

 function test () {
  $argNum  =  func_num_args ();
  $_arg  =  func_get_args ();
  switch ($argNum ) {
   case  1 :
   $this -> test1( $_arg [ 0 ] );
   break ;
  case  2 :
   $this -> test2( $_arg [ 0 ] ,  $_arg [ 1 ]);
   break ;
  default :
   $this -> a = 0 ;
   $this -> b = 1 ;
   break ;
  }
 }

 function test1 ($a) {
  $this -> a =  $a ;
 }

 function test2 ($a,  $b) {
  $this -> a =  $a ;
  $this -> b =  $b ;
 }
}
&#63;>

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