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<!DOCTYPE html>
<html>
<body>

<?php
$array=array(1,2,3);



?>


<script>
for (i=0;i<3;i++)
{
 
let y= "<?php echo $array[i] ?>";
document.write(y);
}




</script>

</body>
</html>

can u tell me why i doesnt print anything from array ? but if a remove loop and  swrite $array[0] it prints 1, but if i write let i=0;
$array;
it prints nothing why ? they are same logic

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PHP runs on the server. - Javascript runs on the client.

On completion of the PHP it sends the page to the client where the javascript runs.

At the time you "echo $array;" the js variable "i" does not yet exist. (Error thrown if turn on error reporting)

By the time the javascript runs "$array" no longer exists.

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<!DOCTYPE html>
<html>
<body>

<script>
<?php echo 'const array = ["one", "two", "three"];'.PHP_EOL; ?>
for (i=0;i<3;i++)
{
document.write(array[i]);
document.write('<br>');
}
</script>

</body>
</html>

your logic needs to change. use php to dynamically author JavaScript code or json/ajax to get values from php scripts. Barand explains the why.

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Because you are trying to use the javascript variable "i" inside the PHP code. Javascript is a client side processor and PHP is a server side processor so when the browser gets the file the PHP will already be processed which will give an error as i is undefined in the PHP code.

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https://forums.phpfreaks.com/topic/323927-need-help-please/#findComment-1634961
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