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$hello = world;$world = 'Hello';echo $hello;
The displayed result is: word, not hello?
php is executed from top to bottom, swap one or two lines to get the result you want
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
php is executed from top to bottom, swap one or two lines to get the result you want