Mixing php and javascript -- under what conditions? -

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under conditions can put php javascript code? ok? bad idea? surprised have not seen more.

for example, came across this..

$('#thumbnail').imgareaselect({aspectratio: '<?php echo $thumb_height/$thumb_width;?>', onselectchange:preview});

..which in onpage script element. i'm not experienced, surprised had never seen mixed js/php before. can put php in .js files well? if set file extension .php, file parsed?

you can put php code *.js files need tell webserver execute php interpreter on *.js files. should in httpd.conf

<ifmodule php5_module>     addtype application/x-httpd-php .php .php5 .js      ... </ifmodule>

a better solution rename *.js files *.js.php or *.php. browsers won't mind , php interpreter executed on those.


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