Set default field values for PMPro User Fields.

pmpro-user-fields-default-value.php

<?php
/**
 * Set default values for PMPro user fields.
 *
 * Supported field types: text, textarea, checkbox, radio, select, select2, multiselect, number, and date.
 * Can support readonly and hidden fields, however, they will not be editable by the user.
 *
 * You can add this recipe to your site by creating a custom plugin
 * or using the Code Snippets plugin available for free in the WordPress repository.
 * Read this companion article for step-by-step directions on either method.
 * https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */

function my_pmpro_user_fields_default_value() {
	global $pmpro_user_fields;

	// Set default values for the fields. Format: 'field_name' => 'default value'
	$default_values = array(
		'example_text'        => 'default value',
		'example_textarea'    => 'Row one.' . "\r\n" . 'Row two.' . "\r\n" . 'Row three.',
		'example_checkbox'    => '1',
		'example_radio'       => 'no',
		'example_select'      => 'Beta',
		'example_select2'     => array( 'Beta', 'Charlie' ),
		'example_multiselect' => array( 'Alpha', 'Beta' ),
		'example_number'      => '123',
		'example_date'        => '2023-05-28', // Format: YYYY-MM-DD
		'example_readonly'    => 'This is a readonly field.',
		'example_hidden'      => 'I am hidden.',
	);

	// Loop through the fields and set the default values.
	foreach ( $pmpro_user_fields as $field_group => $fields ) {
		foreach ( $fields as $field ) {
			// Bail if field type is not supported.
			if ( ! in_array( $field->type, array( 'text', 'textarea', 'checkbox', 'radio', 'select', 'select2', 'multiselect', 'number', 'date', 'readonly', 'hidden' ), true ) ) {
				continue;
			}

			// Check if a default value was specified for the field name and set the field value.
			if ( isset( $default_values[ $field->name ] ) ) {
				// Bail if value is not a string and field type is not multiselect or not select2
				if ( ! is_string( $default_values[ $field->name ] ) && ! in_array( $field->type, array( 'multiselect', 'select2' ), true ) ) {
					continue;
				}
				// Remove html tags from string or array values.
				if ( is_string( $default_values[ $field->name ] ) ) {
					$default_values[ $field->name ] = wp_strip_all_tags( $default_values[ $field->name ] );
				} elseif ( is_array( $default_values[ $field->name ] ) ) {
					foreach ( $default_values[ $field->name ] as $key => $value ) {
						$default_values[ $field->name ][ $key ] = wp_strip_all_tags( $value );
					}
				}
				// Bail if date is not in the correct format.
				if ( 'date' === $field->type && ! preg_match( '/^\d{4}-\d{2}-\d{2}$/', $default_values[ $field->name ] ) ) {
					continue;
				}
				// remove all non-numbers from string if field type is number.
				if ( 'number' === $field->type ) {
					$default_values[ $field->name ] = preg_replace( '/[^0-9]/', '', $default_values[ $field->name ] );
				}
				// if field has options, remove array values that are not in the field options.
				if ( ! empty( $field->options ) ) {
					if ( 'multiselect' === $field->type ) {
						$default_values[ $field->name ] = array_intersect( $default_values[ $field->name ], $field->options );
					} elseif ( 'select2' === $field->type ) {
						$default_values[ $field->name ] = array_intersect( $default_values[ $field->name ], array_keys( $field->options ) );
					} else {
						$default_values[ $field->name ] = in_array( $default_values[ $field->name ], $field->options, true ) ? $default_values[ $field->name ] : '';
					}
				}
				// Set default value if it's not already set.
				if ( empty( $field->value ) ) {
					$field->value = esc_attr( $default_values[ $field->name ] );
				}
			}
		}
	}
}
add_action( 'init', 'my_pmpro_user_fields_default_value' );