``` $website = "Dash" ; $name = 'Tom' ; echo 'Welcome to visit $website. My name is $name.' ; echo '<br>' ; echo "Welcome to visit $website. My name is $name." ; ``` 程序输出： Welcome to visit $website. My name is $name. Welcome to visit Dash. My name is Tom. >[danger]双引号可直接解析变量，单引号不行 ``` //字符串中有"时，我们可以加\解析 $str="abcd\"12'34\"abcd"; $arr[]=1; echo "The first element is $arr[0]."; $Fruit['one']='apple'; //但是字符串中不存在索引数组时，不管下标用'或者"都会报错，这时候我们就需要{}包裹它 echo "The first element is {$Fruit['one']}."; echo "The first element is {$Fruit["one"]}."; ```