下面代码错在哪里？为什么运行提示语法错误？

Question

<?php
$arr1 = ['id'=>100,'demo'=>"SQ"];
$arr2 = [1=>100, 1.3=> "SQ", 1.7="SHI", true="强"];
 print_r($arr1);
 print_r($arr2);
?>

Answer 1

一楼正解

Answer 2

1.7=>      正确=>