在javascript中使用php代码是一个好习惯吗？ [关闭]

Question

I heard lot of experts saying entering php code inside javascript is not a good practice. I wanted to know if it's true. If yes, then will it effect the performance? or is there any other reasons?

For example:

<?php
$num=1;
?>

<script>
var x = "<?php echo $num;?>";
</script>

Answer 1

No, it is not good practice.

will it effect the performance?

I do not specifically know which performance you meant when you wrote that line, but about all performances I can imagine, I would say: Most certainly, no.

is there any other reasons?

Mixing two languages is hard as it requires proper encoding. This makes things complex. Complexity is bad practice.