双引号里面的变量、数组和对象属性表达式
双引号里面的变量可以直接使用：
$test="a test"; print "This is $test";
双引号里面的数组索引不需要单引号：
$testArr=array("a"=>"a test");
print "This is $testArr['a']";//出错
print "This is $testArr[a]";//正确双引号里面使用大括号包含可以使用常规数组格式和对象属性等等：
class MyObj{
function getMessage() {
return "a test";
}
}
$testObj=new MyObj();
$testArr=array("a"=>"a test");
print "This is {$testObj->getMessage()}";
print "This is {$testArr['a']}"; 点赞0
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