Automatically remove all revisions with a "bad" word and revert to the last revision without the bad word - used for cleaning up spam injected content.

revision-reverter.php

<?php
	
function post_revision_menu_page() {
	add_menu_page( 'Revisions', 'Revisions', 'manage_options', 'revision', 'post_revision_page'  );
}
//add_action( 'admin_menu', 'post_revision_menu_page' );

function post_revision_page() {
	/*
	//Time Check 
	$good_time = strtotime( '2015-02-01 00:00:00' );
	$args = array(
		'numberposts' => -1,
		'post_type'   => array( 'post', 'page' ),
	);
	$posts = get_posts( $args );
	foreach( $posts as $post ) {
		$revisions = wp_get_post_revisions( $post->ID );
		foreach( $revisions as $revision ) {
			$revision_time = strtotime( $revision->post_date_gmt );
			if ( $revision_time > $good_time ) {
				wp_delete_post_revision( $revision->ID );	
			} else {
				wp_restore_post_revision( $revision->ID );
				break;
			}
		}
	}
	/**/
	
	//Word Check 
	$bad_word = 'display: none';
	$args = array(
		'numberposts' => -1,
		'post_type'   => array( 'post', 'page' ),
	);
	$posts = get_posts( $args );
	foreach( $posts as $post ) {
		if ( false !== stripos( $post->post_content, $bad_word ) ) {
			$revisions = wp_get_post_revisions( $post->ID );
			foreach( $revisions as $revision ) {
				if ( false !== stripos( $revision->post_content, $bad_word ) ) {
					wp_delete_post_revision( $revision->ID );	
				} else {
					wp_restore_post_revision( $revision->ID );
					break;
				}
			}
		}
	}
	/**/
}