write php file in php

Hi, i’m trying to create a php with php.I know how to use fopen, fwrite & fclose but the file that i have to create is stored in a variable that contains mixed html and php (html written as $row.=”<table>blahblah</table> etc.. but i need php file because there is some dynamic content). If i use fopen, fwrite & fclose methods i receive this error?arse error: parse error, unexpected T_VARIABLE.
I suppose i had to skip() all the “(because it is intended as closing the string to write on the file) & $ in the HTML code but in this way i had to change all the function in the other PHP files that i have used in this file.
Some solutions?
Thanks
NB I have tried to echo this variable with echo and it prints perfectly my page

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