html - Using PHP to generate part of a background URL in CSS-file -

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i need php generate part of path name background image, used in css-file. changed file type php , added header, suggested in post on stackoverflow. however, cannot work. believe php generates , error , terminates other code after that, not sure how acquire error message. code is:

<?php     header('content-type: text/css'); ?>  body {     min-height: 100%;     background: url("<?php echo asset_url(); ?>images/backgroundimage.jpg");     background-size: cover;     background-repeat: no-repeat;     background-position: center top; }

the asset_url() function has been tested, , working elsewhere, should not issue. example of working here:

<link rel="stylesheet" type="text/css" href="<?php echo asset_url(); ?>css/basicstyle.php">

am missing totally obvious here?

update: pretty sure css loaded, worked before changed php (i did not change else). inspection of site, once uploaded, shows following in 

<link rel="stylesheet" type="text/css" href="http://e-drift.dk/assets/css/basicstyle.php">

however none of css in file applied correctly, not thing.

are sure you're including required includes?

your error message shows this;

call undefined function asset_url() in /var/www/web/web694777/e-drift.dk/assets/css/basicstyle.php on line 7


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