This is a set of extendable classes to allow easy handling of custom post fields.

Automattic

Thorsten Ott

<p>Features:</p>
<ul>
<li>simply generate post boxes with multiple fields / groups</li>
<li>easily validate/sanitize input and output data</li>
<li>easy access to field data via $easy_cf->field_id->get() or $easy_cf->field_id->get( NULL, $raw=true );</li>
<li>get error messages for validation failures via admin notices</li>
<li>custom post type aware</li>
<li>extendable to your needs by extending Easy_CF_Field and Easy_CF_Validator classes (see advanced usage)</li>
</ul>
<p>As this script is mainly meant as basis for developers it needs minor coding skills to add this functionality<br />
to your theme.</p>
<p>In order to make use of this class simply initialize it from the functions.php file of your theme as described below.</p>
<h4>Simple Usage</h4>
<pre><code>require_once( WP_PLUGIN_DIR . '/easy-custom-fields/easy-custom-fields.php' );
$field_data = array (
    'testgroup' => array (              // unique group id
        'fields' => array(              // array "fields" with field definitions
            'field1'    => array(),     // globally unique field id
            'field2'    => array(),
            'field3'    => array(),
        ),
    ),
);
$easy_cf = new Easy_CF($field_data);
</code></pre>
<h4>Advanced Usage</h4>
<pre><code>require_once( WP_PLUGIN_DIR . '/easy-custom-fields/easy-custom-fields.php' );
$field_data = array (
    'testgroup' => array (
        'fields' => array(
            'field1'    => array(),
            'field2'    => array(),
            'field3'    => array(),
        ),
    ),
    'advanced_testgroup' => array (                                     // unique group id
        'fields' => array(                                              // array "fields" with field definitions 
            'advanced_field'    => array(                               // globally unique field id
                'label'         => 'Advanced Field Description',        // Field Label
                'hint'          => 'Long Advanced Field description',   // A descriptive hint for the field
                'type'          => 'textarea',                          // Custom Field Type (see Ref: field_type)
                'class'         => 'aclass',                            // CSS Wrapper class for the field
                'input_class'   => 'theEditor',                         // CSS class for the input field
                'error_msg'     => 'The Advanced Field is wrong' ),     // Error message to show when validate fails
                'validate'      => 'validatorname',                     // Custom Validator (see Ref: validator)
            'advanced_email' => array(
                'label' => 'Email',
                'hint' => 'Enter your email',
                'validate' => 'email', )
        ),
        'title' => 'Product Description',   // Group Title
        'context' => 'advanced',            // context as in https://codex.wordpress.org/Function_Reference/add_meta_box
        'pages' => array( 'post', 'page' ), // pages as in https://codex.wordpress.org/Function_Reference/add_meta_box
    ),
);

if ( !class_exists( "Easy_CF_Validator_Email" ) ) {

    class Easy_CF_Validator_Email extends Easy_CF_Validator {
        public function get( $value='' ) {
            return esc_attr( $value );
        }

        public function set( $value='' ) {
            $value = esc_attr( trim( stripslashes( $value ) ) );
            return $value;
        }

        public function validate( $value='' ) {
            if ( empty( $value ) || is_email( $value ) ) 
                return true;
            else
                return false;
        }
    }
}

if ( !class_exists( "Easy_CF_Field_Textarea" ) ) {
    class Easy_CF_Field_Textarea extends Easy_CF_Field {
        public function print_form() {
            $class = ( empty( $this->_field_data['class'] ) ) ? $this->_field_data['id'] . '_class' :  $this->_field_data['class'];
            $input_class = ( empty( $this->_field_data['input_class'] ) ) ? $this->_field_data['id'] . '_input_class' :  $this->_field_data['input_class'];

            $id = ( empty( $this->_field_data['id'] ) ) ? $this->_field_data['id'] :  $this->_field_data['id'];
            $label = ( empty( $this->_field_data['label'] ) ) ? $this->_field_data['id'] :  $this->_field_data['label'];
            $value = $this->get();
            $hint = ( empty( $this->_field_data['hint'] ) ) ? '' :  '<p><em>' . $this->_field_data['hint'] . '</em></p>';

            $label_format =
                '<div class="%s">'.
                '<p><label for="%s"><strong>%s</strong></label></p>'.
                '<p><textarea class="%s" style="width: 100%%;" type="text" name="%s">%s</textarea></p>'.
                '%s'.
                '</div>';
            printf( $label_format, $class, $id, $label, $input_class, $id, $value, $hint );
        }
    }
}

$easy_cf = new Easy_CF($field_data);
</code></pre>
<h4>Note</h4>
<p>If you’re not using auto_init then meta boxes need to be added individually using<br />
add_meta_box( $group_id, $group_title, array( &$easy_cf, ‘meta_box_cb’ ), $page, $group_context );<br />
and the save methods need to be initialized after adding all meta boxes using<br />
$easy_cf->add_save_method();</p>


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