输出
echo
可以输出一个或者多个字符串
echo "hello","many","this";
print
只允许输出一个字符串。返回值为1
print "hello";
输出变量要用{}
print "My car is a {$cars[0]}";
变量
常量–默认为全局的
define("name","value");
- name:常量名,value:常量值
并置字符串连接符(.)
echo "you"." "."are mine";
字符串长度 strlen()
不等于两种表示方法
<>
!=
逻辑运算符
$x and $y; 与
$x or $y;
$x xor $y; 异或
数组
定义数组
$car=array("BMW","toyota","VOlvo");
获取数组的长度
count($array);
遍历数组
$people=array("man","women","middle");
for($i=0;i<count($people);$i++){
echo $peolpe[$i];
echo "<br/>";
}
关联数组
$age=array("peter"=>12,"Jone"=>23,"Mun"=>42);
echo "<br/>";
echo $age["peter"];