How to Replace the All in One SEO Pack for WordPress

class myCustomFields {
/**
* @var string $prefix The prefix for storing custom fields in the postmeta table
*/
var $prefix = 'cn_';
/**
* @var array $postTypes An array of public custom post types, plus the standard "post" and "page" - add the custom types you want to include here
*/
var $postTypes = array( "page", "post" );
/**
* @var array $customFields Defines the custom fields available
*/
var $customFields = array(
array(
"name" => "title",
"title" => "Title Tag",
"description" => "For SEO, this should be a poignant title for what this page is actually about.",
"type" => "text",
"scope" => array( "post", "page" ),
"capability" => "edit_pages"
),
array(
"name" => "description",
"title" => "Meta Description",
"description" => "For SEO, this won't help get you better search results, but will sometimes be shown to users on search results pages.",
"type" => "textarea",
"scope" => array( "post", "page" ),
"capability" => "edit_posts"
)
);
/**
* PHP 4 Compatible Constructor
*/
function myCustomFields() { $this->__construct(); }
/**
* PHP 5 Constructor
*/
function __construct() {
add_action( 'admin_menu', array( &$this, 'createCustomFields' ) );
add_action( 'save_post', array( &$this, 'saveCustomFields' ), 1, 2 );
// Comment this line out if you want to keep default custom fields meta box
add_action( 'do_meta_boxes', array( &$this, 'removeDefaultCustomFields' ), 10, 3 );
}
/**
* Remove the default Custom Fields meta box
*/
function removeDefaultCustomFields( $type, $context, $post ) {
foreach ( array( 'normal', 'advanced', 'side' ) as $context ) {
foreach ( $this->postTypes as $postType ) {
remove_meta_box( 'postcustom', $postType, $context );
}
}
}
/**
* Create the new Custom Fields meta box
*/
function createCustomFields() {
if ( function_exists( 'add_meta_box' ) ) {
foreach ( $this->postTypes as $postType ) {
add_meta_box( 'my-custom-fields', 'Custom Fields', array( &$this, 'displayCustomFields' ), $postType, 'normal', 'high' );
}
}
}
/**
* Display the new Custom Fields meta box
*/
function displayCustomFields() {
global $post;
?>
<div class="form-wrap">
<?php
wp_nonce_field( 'my-custom-fields', 'my-custom-fields_wpnonce', false, true );
foreach ( $this->customFields as $customField ) {
// Check scope
$scope = $customField[ 'scope' ];
$output = false;
foreach ( $scope as $scopeItem ) {
switch ( $scopeItem ) {
default: {
if ( $post->post_type == $scopeItem )
$output = true;
break;
}
}
if ( $output ) break;
}
// Check capability
if ( !current_user_can( $customField['capability'], $post->ID ) )
$output = false;
// Output if allowed
if ( $output ) { ?>
div class="form-field form-required" id="ll-<?php echo $customField[ 'name' ]; ?>">
<?php
switch ( $customField[ 'type' ] ) {
case "checkbox": {
// Checkbox
echo '<label for="' . $this->prefix . $customField[ 'name' ] .'" style="display:inline;"><b>' . $customField[ 'title' ] . '</b></label>  ';
echo '<input type="checkbox" name="' . $this->prefix . $customField['name'] . '" id="' . $this->prefix . $customField['name'] . '" value="yes"';
if ( get_post_meta( $post->ID, $this->prefix . $customField['name'], true ) == "yes" )
echo ' checked="checked"';
echo '" style="width: auto;" />';
break;
}
case "textarea":
case "wysiwyg": {
// Text area
echo '<label for="' . $this->prefix . $customField[ 'name' ] .'"><b>' . $customField[ 'title' ] . '</b></label>';
echo '<textarea name="' . $this->prefix . $customField[ 'name' ] . '" id="' . $this->prefix . $customField[ 'name' ] . '" columns="30" rows="3">' . htmlspecialchars( get_post_meta( $post->ID, $this->prefix . $customField[ 'name' ], true ) ) . '</textarea>';
// WYSIWYG
if ( $customField[ 'type' ] == "wysiwyg" ) { ?>
<script type="text/javascript">
jQuery( document ).ready( function() {
jQuery( "<?php echo $this->prefix . $customField[ 'name' ]; ?>" ).addClass( "mceEditor" );
if ( typeof( tinyMCE ) == "object" && typeof( tinyMCE.execCommand ) == "function" ) {
tinyMCE.execCommand( "mceAddControl", false, "<?php echo $this->prefix . $customField[ 'name' ]; ?>" );
}
});
</script>
<?php }
break;
}
default: {
// Plain text field
echo '<label for="' . $this->prefix . $customField[ 'name' ] .'"><b>' . $customField[ 'title' ] . '</b></label>';
echo '<input type="text" name="' . $this->prefix . $customField[ 'name' ] . '" id="' . $this->prefix . $customField[ 'name' ] . '" value="' . htmlspecialchars( get_post_meta( $post->ID, $this->prefix . $customField[ 'name' ], true ) ) . '" />';
break;
}
}
?>
<?php if ( $customField[ 'description' ] ) echo '<p>' . $customField[ 'description' ] . '</p>'; ?>
</div>
<?php
}
} ?>
</div>
<?php
}
/**
* Save the new Custom Fields values
*/
function saveCustomFields( $post_id, $post ) {
if ( !isset( $_POST[ 'my-custom-fields_wpnonce' ] ) || !wp_verify_nonce( $_POST[ 'my-custom-fields_wpnonce' ], 'my-custom-fields' ) )
return;
if ( !current_user_can( 'edit_post', $post_id ) )
return;
if ( ! in_array( $post->post_type, $this->postTypes ) )
return;
foreach ( $this->customFields as $customField ) {
if ( current_user_can( $customField['capability'], $post_id ) ) {
if ( isset( $_POST[ $this->prefix . $customField['name'] ] ) && trim( $_POST[ $this->prefix . $customField['name'] ] ) ) {
$value = $_POST[ $this->prefix . $customField['name'] ];
// Auto-paragraphs for any WYSIWYG
if ( $customField['type'] == "wysiwyg" ) $value = wpautop( $value );
update_post_meta( $post_id, $this->prefix . $customField[ 'name' ], $value );
} else {
delete_post_meta( $post_id, $this->prefix . $customField[ 'name' ] );
}
}
}
}
} // End Class
} // End if class exists statement
// Instantiate the class
if ( class_exists('myCustomFields') ) {
$myCustomFields_var = new myCustomFields();
}