php基础知识点
1.<!doctype html>
<html>
<body>
<?php
$x="Hello world";
echo $x;
echo "<br>";
$x='Hello world';
echo $x;
?>
</body>
</html>
2.var_dump()会返回变量的数据类型和值
<?php
$x=5985;
var_dump($x);
echo "<br>";
$x=-345;
var_dump($x);
echo "<br>";
$x=0x8C;
var_dump($x);
echo "<br>";
$x=047;
var_dump($x);
?>
运行结果：
int(5985)
int(-345)
int(140)
int(39)
3.<?php
$car=array("Volvo","BMW","SAAB");
var_dump($car);
?>
运行结果：
array(3) { [0]=> string(5) "Volvo" [1]=> string(3) "BMW" [2]=> string(4) "SAAB" }
4.php对象
<?php
class Car
{
var $color;
function Car($color="green")
{
$this->color=$color;
}
function what_color()
{
return $this->color;
}
}
function print_vars($obj)
{
foreach(get_object_var($obj) as $prop=>$val) {
echo "\t $prop = $val\n";
}
}
$herrbie=new Car("white");
echo "\herbie:Properties\n";
print_vars($herbie);
?>
