在PHP中$this 和->的用法和意思
Like:Class car{ private $VIN}Public function set_VIN($value)
{$this -> VIN =$value}
Like:Class car{ private $VIN}Public function set_VIN($value)
{$this -> VIN =$value}
class a{
public $a;//为空,当test()中的$this->a赋值则最后值为1public function test()
{
$this->a=1;
}
}
$a=new a();
echo $a->a;
<?php
class A
{
function foo()
{
if (isset($this)) {
echo '$this is defined (';
echo get_class($this);
echo ")\n";
} else {
echo "\$this is not defined.\n";
}
}
}class B
{
function bar()
{
A::foo();
}
}$a = new A();
$a->foo();
A::foo();
$b = new B();
$b->bar();
B::bar();
?>
以上例程会输出:
$this is defined (a)
$this is not defined.
$this is defined (b)
$this is not defined.
Example #2 简单的类定义
<?php
class SimpleClass
{
// 成员声明
public $var = 'a default value'; // 方法声明
public function displayVar() {
echo $this->var;
}
}
?>
Example #3 类成员的默认值
<?php
class SimpleClass
{
// 无效的类成员定义:
public $var1 = 'hello '.'world';
public $var2 = <<<EOD
hello world
EOD;
public $var3 = 1+2;
public $var4 = self::myStaticMethod();
public $var5 = $myVar; // 正确的类成员定义:
public $var6 = myConstant;
public $var7 = self::classConstant;
public $var8 = array(true, false);
}
?>