Add htaccess rules with insert_with_markers at beginning of htaccess

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Using insert_with_markers() function you can insert your rules only between WordPress comments e.i. # BEGIN WordPress and # END WordPress.

So, you should use plain PHP to achieve your aim.

  1. Create your rules
  2. Read existing .htaccess and concatenate your and existing rules
  3. Write the file

Here is a dirty example:

<?php
$str  = "# BEGIN  TEST\n# MY RULES\n# END TEST\n";
$str .= file_get_contents( ABSPATH . '.htaccess' );
file_put_contents( ABSPATH . '.htaccess', $str );

Or use FILE_APPEND flag with the file_put_contents().

Remember!

It’s a very bad idea to allow PHP to alter your .htaccess. One infected file is enough to break your server.