php5 中$this ,self,parent,static const

最新推荐文章于 2025-11-24 04:43:01 发布

原创最新推荐文章于 2025-11-24 04:43:01 发布 · 953 阅读

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#php #function #fun #class #null #扩展

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博客主要介绍了PHP中const、$this、self、static的运用与区别，通过代码示例展示了它们在类中的使用情况。同时还讲解了parent在扩展class上的应用，给出了相关代码示例，帮助理解其在继承中的作用。

关于php5 中$this ,self,parent,static const的使用,理清一下.const,$this,self static 运用与区别Code:

const,$this,self static 运用与区别

Code:

class foo{
const TMP = 'This is const TMP';
private static $tmp1 = 0;
private $tmp2 = 1;
function __construct()
{
  print self::$tmp1;
  //print self::$tmp2; //error $tmp2 is not static
  //print $this->tmp1; //null $this->tmp1 is null,tmp1 is static
  print $this->tmp2;
  print self::TMP; //print 'this is const TMP'
}

static function test()
{
  print "this is static fun";
}
}

print foo::TMP; //print const TMP;
foo::test(); //print test() out;
$obj = new foo;
$obj->test(); //this is fun

parent 主要用在扩展class 上,

Code:

<?php
class foo{
const TMP = 'This is const TMP';
private static $tmp1 = 0;
private $tmp2 = 1;
function __construct()
{
  print self::$tmp1;
  //print self::$tmp2; //error $tmp2 is not static
  //print $this->tmp1; //null $this->tmp1 is null,tmp1 is static
  print $this->tmp2;
  print self::TMP; //print 'this is const TMP'
}

static function test()
{
  print "this is static fun";
}
}

class foo2 extends foo{

function __construct()
{
  parent::__construct(); //__connstruct used
  parent::test(); //print static fun;
  print parent::TMP; //print const
  //print parent::tmp1; //error
}
}
print foo::TMP; //print const TMP;
foo::test(); //print test() out;
$obj = new foo;
$obj->test(); //this is fun

print "/n Test parent /n";

$obj2 = new foo2();

?>¢