Replacing a CSS class using PHP? -

i'm building backend web application, possible change design of page. once user has setup design way it, should able save , new design written specific file.

for reason, need replace characters between { , } after string, name of class.

so simple concept, following class in seperate file load view, style.php. need go from:

from

<style> .bonus {     bottom: 6px;     left: 247px; } </style> 

to

<style> .bonus {     bottom: 20px;     left: 450px; } </style> 

could recommend me on best way to

a) find string in file,

b) when found, replace between 2 strings right after first string.

thank you.

i don't concept of user making changes actual file much. there lot of safer methods user create , maintain custom template without them making changes php file.

what storing user's css in field in database? you'd need like:

<?php       $css = getcssbyuserid($userid); //function runs query on db user-specific css  /* $css = ".bonus {     bottom: 20px;     left: 450px; }" */  ?> <style>      <?php echo $css; ?> </style>