This function is deprecated; use mysql_real_escape_string() instead

mysql_real_escape_string() extension was deprecated in PHP 5.5.0. So you can try below code:

if ( $wpdb->get_var( $wpdb->prepare( "SELECT count(*) FROM {$wpdb->prefix}datalist WHERE `url` = %s", $_SERVER['REQUEST_URI'] ) == '1' ) )

You can get more here.

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