在命令行中定义一个字符串：
$name="runoob";
$a=
"abc"$name
"123"
EOF;
//结束需要独立一行且前后不能空格
echo $a;
?>
注意：
以
php基本对象
php对象
class Car
{
var $color;
function __construct($color="green") {
$this->color = $color;
}
function what_color() {
return $this->color;
}
}
?>
php常量
语法定义：
bool define ( string $name , mixed $value [, bool $case_insensitive = false ] )
name：必选参数，常量名称，即标志符。
value：必选参数，常量的值。
case_insensitive ：可选参数，如果设置为 TRUE，该常量则大小写不敏感。默认是大小写敏感的。
// 不区分大小写的常量名
define("GREETING", "欢迎访问 Runoob.com", true);
echo greeting;// 输出 "欢迎访问 Runoob.com"
?>
php字符串处理
字符串连接：
‘ . ’
$txt1="Hello world!";
$txt2="What a nice day!";
echo $txt1 . " " . $txt2;
?>
字符串求长度
echo strlen("Hello world!");
?>
字符串位置
echo strpos("Hello world!","world");
?>
php数据运算
$x = array("a" => "red", "b" => "green");
$y = array("c" => "blue", "d" => "yellow");
$z = $x + $y; // $x 和 $y 数组合并
var_dump($z);
var_dump($x == $y);
var_dump($x === $y);
var_dump($x != $y);
var_dump($x $y);
var_dump($x !== $y);
?>
php数组
基础数据
$cars=array("Volvo","BMW","Toyota");
var_dump($cars);
?>
获取数组值
$cars=array("Volvo","BMW","Toyota");
echo "I like " . $cars[0] . ", " . $cars[1] . " and " . $cars[2] . ".";
?>
获取数组长度
$cars=array("Volvo","BMW","Toyota");
echo count($cars);
?>
遍历数组
$cars=array("Volvo","BMW","Toyota");
$arrlength=count($cars);
for($x=0;$x
{
echo $cars[$x];
echo "";
}
?>
关联数组
$age=array("Peter"=>"35","Ben"=>"37","Joe"=>"43");
echo "Peter is " . $age['Peter'] . " years old.";
?>
