php變量常量

<?php
	$name;
	$name = "張三";
	echo $name;
?>

<?php
	$name = "lisi";
	$name = "1231";
	$age = $age2 = $age3 =18;
	echo $age."<br/>";
	echo $age2."<br/>";
	echo $name;
?>

<?php
	//常量
	define("PI",3.1415926);
	//求半徑是10的圓面積
	$s = PI*10*10;
	echo $s;
?>

<?php

					echo __LINE__;
					echo __FILE__;
	echo "<br/>";
    function test()
    {
    	echo __FUNCTION__;
    }
    test();

    class test
    {
    	public $name;
    	public function getMethod()
    	{
    		echo "我是屬於這個方法：".__METHOD__;
    		echo "<br/>";
    	}
    	public function getClassName()
    	{
    		echo "我是屬於這個類：".__CLASS__;
    	}
    }
    //建立對象
    $test = new test;
    $test->getMethod();
    $test->getClassName();
?>

<?php
	$name = "張三";
	echo $name;
	$arr = array(1,2.2,3,'dfsa','犯得着看見發貨');
	//var_dump(name);
	//var_dump($name);
	//var_dump($arr);
	//print_r($arr);
	print($arr);

?>