Filter Hooks

This filter can be used to modify/add user data before user registration. Custom validation before user registration is possible.

Parameters: $userData (array)

Example

More validation before user register

add_filter( 'user_meta_pre_user_register', 'user_meta_pre_user_register_function' );
function user_meta_pre_user_register_function( $userData ){
    // Write your code for more validation before user register.
    // return WP_Error object if there are any error or validation failed.
    
    return $userData;
}

Add more extra data to usermeta table

add_filter( 'user_meta_pre_user_register', 'user_meta_pre_user_register_function' );
function user_meta_pre_user_register_function( $userData ){
    // You can add some conditionl metadata
    $userData[ 'new_meta_key' ] = 'New Meta Value';
    
    return $userData;
}

Change Log: Since 1.1.2

This filter hook can be use to modify fields data.
Function arguments: Form Data (array), Field ID (int), Form Name (string)

Supported array key for Form Data (first argument):

• field_title – Field Title.
• field_type – Type of html input (e.g. checkbox, text, hidden, select).
• field_name – Name of the field.
• field_value – Retrieved value of the field.
• default_value – Assign a default value when field_value is empty.
• title_position – Supported value: top, left, right, inline, hidden (default: top).
• description – Description of the field.
• meta_key – Should use only for extra fields.
• options – (string | array) Populate options for dropdown, checkbox and radio field.
• max_char – Allowed maximim character.
• field_size – Field size in pixel (e.g. 200px).
• before – Content before field.
• after – Content after field.

• required – Indicate field as required.
• unique – Indicate field as unique.
• admin_only – If set, the field is accessible only for admin.
• non_admin_only – Only viewable for non-admin
• read_only – If set, read only for all user.
• read_only_non_admin – If set, the field will be read only for non-admin user.

• css_class – Css class for field container.
• css_style – Inline css style for field container.
• input_id – Input id for field itself.
• field_class – Assign class to field itself.
• field_style – Assign inline css stye for field itself.
• label_id – Label ID.
• label_class – Assign class to field label.
• description_id – ID attribute for description paragraph.
• description_class – Assign class to field description.
• description_style – Assign inline css style for field description.

Note: This filter hook is available since 1.1.3rc2

Example:

Assign css class to field:

add_filter( 'user_meta_field_config', 'user_meta_field_config_function', 10, 3 );
function user_meta_field_config_function( $field, $fieldID, $formName ){    
    if( $fieldID != 'Enter field id that you need to control' )
        return $field;

    $field['field_class'] = 'class1 class2';

    return $field;
}

Use comma in option:

add_filter( 'user_meta_field_config', 'user_meta_field_config_function', 10, 3 );
function user_meta_field_config_function( $field, $fieldID, $formName ){        
    if( $fieldID != 'Your field id here' )
        return $field;

    $field['options'] = "yes=Yes, Agree, no=No, Disagree";

    return $field;
}

Note: Moreover, use ascii code of comma where you want to appear it. asciitable