$wp_filesystem->get_contents()

$wp_filesystem->get_contents() replaced file_get_contents() perfectly as a drop-in replacement. Of course, it must be initiated with WP_Filesystem(); first.

Here is a before and after example…

Before:

if ( (strpos ( file_get_contents ( $check_this_file ),
    $check_this_string ) === false) ) {...}

After:

WP_Filesystem();
if ( (strpos ( $wp_filesystem->get_contents ( $check_this_file ),
    $check_this_string ) === false) ) {...}