mypmpro-restrict-registration-by-custom-field-and-levels.php

<?php //do not copy


function my_pmpro_registration_checks( $okay, $level ){

	global $pmpro_msg, $pmpro_msgt;

    /**
     * Restricts based on gender field - START
     */
	$gender = isset( $_REQUEST['gender'] ) ? $_REQUEST['gender'] : ''; //change to your field name 

    if( empty( $gender ) ) {
        return $okay;
    }

    if( $gender == 'Ma' ) {
        $pmpro_msg = "You cannot sign up for this membership level"; //change to your preferred wording
		$pmpro_msgt = "pmpro_error";
		return false;
    }
    /**
     * Restricts based on gender field - END
     */

    
    /**
     * Restricts based on current level - START
     */
    //Gets the levels of the current member if they are logged in
    $levels = pmpro_getMembershipLevelsForUser();

    if( !$levels ) {
        return $okay;
    }

    $levels_not_allowed = array( 1, 2 ); //Level 1 and 2 can't sign up if they have level 3
    $level_required = 3;
    
    foreach( $levels as $member_levels ) {
        if( $member_levels->id == $level_required ) {
            //They have level 3 in this case, lets check what level they want to sign up for
            if( in_array( $level, $levels_not_allowed ) ) {
                $pmpro_msg = "You cannot sign up for level 1 or 2 because you hold level 3."; //change to your preferred wording
                $pmpro_msgt = "pmpro_error";
                return false;
            }
        }
    }
    /**
     * Restricts based on current level - END
     */
		
    return $okay;

}
add_filter( "pmpro_registration_checks", "my_pmpro_registration_checks", 10, 2 );