Avoiding Undefined Functions doc update

php

<?php

/**
 * 
 * https://www.paidmembershipspro.com/avoiding-undefined-function-errors-hooks-filters-custom-code/
 * 
 * SUMMARY of article examples 
 * 
 * 1- pmprorh_add_registration_field (Register Helper)
 * 2- pmpro_has_membership_access (PMPro core)
 * 3- pmpro_hasMembershipLevel (PMPro core)
 * 4- MemberOrder (PMPro core)
 * 5- TGMPA https://github.com/TGMPA/TGM-Plugin-Activation
 * 6- PMPRO_VERSION  (PMPro core)
 * 7- pmpro_checkout_level filter (PMPro core)
 * 
 */


//1)
//Old register helper https://github.com/strangerstudios/pmpro-register-helper/blob/aa140198b62dc6abd6c4328d8c829ac56426569e/pmpro-register-helper.php#L117
/*
	Add a field to the PMProRH regisration fields global

	$where refers to various hooks in the PMPro checkout page and can be:
	- after_username
	- after_password
	- after_email
	- after_captcha
	- checkout_boxes
	- after_billing_fields
	- before_submit_button
	- just_profile (make sure you set the profile attr of the field to true or admins)
*/
function pmprorh_add_registration_field($where, $field) {
	global $pmprorh_registration_fields;
	if(empty($pmprorh_registration_fields[$where])) {
		$pmprorh_registration_fields[$where] = array();
	}
	if ( !empty($field) && is_a( $field, 'PMProRH_Field') ) {
		$pmprorh_registration_fields[$where][] = $field;
		return true;
	}

	return false;
}
// New core function https://github.com/strangerstudios/paid-memberships-pro/blob/2226f37d713b73fbefba81c7f6ca8a3600b708ce/includes/fields.php#L38
/**
	* Add a field to the PMProRH regisration fields global
	*
	*	$where refers to various hooks in the PMPro checkout page and can be:
*	- after_username
*	- after_password
*	- after_email
*	- after_captcha
*	- checkout_boxes
*	- after_billing_fields
*	- before_submit_button
*	- just_profile (make sure you set the profile attr of the field to true or admins)
*/
function pmpro_add_user_field( $where, $field ) {
	global $pmpro_user_fields;
	
	/**
		* Filter the group to add the field to.
		* 
		* @since 2.9.3
		* 
		* @param string $where The name of the group to add the field to.
		* @param PMProField $field The field being added.
		*/
	$where = apply_filters( 'pmpro_add_user_field_where', $where, $field );
	
	/**
		* Filter the field to add.
		* 
		* @since 2.9.3
		*             
		* @param PMProField $field The field being added.
		* @param string $where The name of the group to add the field to.
		*/
	$field = apply_filters( 'pmpro_add_user_field', $field, $where );
	
	if(empty($pmpro_user_fields[$where])) {
		$pmpro_user_fields[$where] = array();
	}
	if ( ! empty( $field ) && pmpro_is_field( $field ) ) {
		$pmpro_user_fields[$where][] = $field;
		return true;
	}

	return false;
}


/********************************
*       NEW PROPOSED EXAMPLE    *
*********************************/

function my_pmpro_add_fields_to_checkout() {
	// Don't break if PMPro is out of date or not loaded.
	if ( ! function_exists( 'pmpro_add_user_field' ) ) {
		return false;
	}

	// This is where our fields code will go.
	$fields = new PMPro_Field(
		'company',
		'text',
		array(
			'label' => 'Company',
			'size' => 40,
			'class' => 'company',
			'profile' => true,
			'required' => true,
			'levels' => array(1,2),
			'memberslistcsv' => true
			)
	);

	// Add a field group to put our fields into.
	pmpro_add_field_group( 'Business Details' );

	// Add all of our fields into that group.
	foreach ( $fields as $field ) {
		pmpro_add_user_field(
			'Business Details',
			$field
		);
	}
}
add_action( 'init', 'my_pmpro_add_fields_to_checkout' );

?>