how to fix the SyntaxError: unterminated string literal when embed php in javascript? -

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when try this：

var app_app = <?=$app_app?>;

i got error:

syntaxerror: unterminated string literal var app_app = '<br />

strange, can me ? 

var app_app = "<?php echo $app_app; ?>";

note: have echo out php variable define javascript , wrap inside quotes


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