jquery how to break string and continue string after - php

Question

im trying to do this to get loop i variable inside my php variable
var monthyear[i] = "<?php echo $startmonth_name"+i+" ?>";
so it will show like:
var monthyear[i] = "<?php echo $startmonth_name1 ?>";
var monthyear[i] = "<?php echo $startmonth_name2 ?>";
can't figure it out and i keep getting error:
Parse error: syntax error, unexpected T_CONSTANT_ENCAPSED_STRING, expecting ',' or ';'

Answer 1

Loop in javascript won't work for reasons mentioned in my comment, you can try having a loop in php code, something like below.
Replace this with
var monthyear[i] = "<?php echo $startmonth_name1 ?>";
var monthyear[i] = "<?php echo $startmonth_name2 ?>";
With
<?php
for($i=0;$i<some_value;$i++)
{
echo "var monthyear[".$i."] = ". ${'startmonth_name'.$i} .";"
}
?>
Note: I haven't tested the code. This is just to give an idea.

Answer 2

do this instead:
<?php echo "var monthyear["+i+"] = '"+ $startmonth_name[i]+"';"; ?>;
change these to an array to use them in the loop: $startmonth_name1

Answer 3

Forget about JavaScript right now. JavaScript will be executed later, in another computer, possibly some thousand kilometres away. You are getting a PHP parse error: that means that your PHP code does not even run. And it's clear why—the PHP block contained in this code:
var monthyear[i] = "<?php echo $startmonth_name"+i+" ?>";
... is this:
echo $startmonth_name"+i+"
You might get away with something like this:
var monthyear[i] = <?php echo json_encode($startmonth_name); ?>+i;
Yet I suggest you remember that PHP and JavaScript will simply neither interact nor share variables and rethink your logic accordingly.