What’s the use of that line?

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I intend to know what this line of code within my HTML does? Why when I delete it the site stops working?

<script src="js/main.js?nocache=<?php echo md5(microtime()) ?>"></script>
php javascript html
  • 1

    This line imports a script by passing a parameter nocache whose value is defined by md5(microtime()) from php.

  • 4

    That means the model you picked up is full of tricks. First, if the site for whole, is pq depends all on a JS (if it is a game, or very specific application, it is even understandable. If it is a conventional site, it should not depend entirely on JS). Second, that the site will always reload the JS every time, because the url changes all the time, which is bad for band and performance. Third that the person does not know well PHP, pq o uniqid is much more suitable for this and does not run the risk of collision. Fourth, if it is only to have no cache, do not need to write nocache=, would suffice main.js?<?php....

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It is unlikely that the nocache is necessary at some point in this script, but only seeing what is inside him to say what. Apparently it was put (as its name already says) to the browser not cache the script, because the URL will change every time the page is reloaded, and what goes for the browser is the whole, not just the main.js.

Anyway the reason the site stopped working is that it adopted a dependency pattern of this script. The ideal is that this does not happen, IE, the site may not even be in its best state but should work anyway. Exists technique for this. It is understandable that the site requires the presence of JS and scripts specific to work well, but completely prevent use is not usually a good idea.

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