Ninja Forms Australian Phone number validation

functions.php

//
// Hook the Ninja forms before submitting
//
add_filter( 'ninja_forms_submit_data', 'my_ninja_forms_submit_data' );


//
// This function hooks the Ninja submission step
// Thanks to https://stackoverflow.com/questions/61440656/ninja-forms-server-side-validation-not-working
//
function my_ninja_forms_submit_data( $form_data ) {

    $form_settings = $form_data[ 'settings' ]; // Form settings.

    // Contact form is ID #1
    if ($form_data['id'] == '1') {
        // Target key field.
        // With Ninja dev mode enabled, open the phone field settings and set Administration > Field Key and set to this value
        $target_key = 'phone_au';
        
        foreach( $form_data[ 'fields' ] as $field ) {
  
            if( $target_key == $field[ 'key' ] ) {
                // Now pass the phone field value to the AU phone number validator
                if ( ! bl_match_aus_phone($field['value']) ) {
                    $form_data['errors']['fields'][$field['id']] = "You must provide a valid AU phone number.";
                }
            }
        }
    }
    return $form_data;
}


//
// This is my generic AU phone format validator.
//
function bl_match_aus_phone ( $number ) {
	try {	
		// Get rid of any non-numerics
		$number = preg_replace('/[^0-9]/s', '', $number);
		
		if (preg_match('/^0(2|3|4|7|8)?\d{8}$/', $number) || preg_match('/^61(2|3|4|7|8)?\d{8}$/', $number) ||
			preg_match('/^1(3|8)00\d{6}$/', $number) || preg_match('/^13\d{4}$/', $number) || 
			preg_match('/^611(3|8)00\d{6}$/', $number) || preg_match('/^6113\d{4}$/', $number) ) {
			$result = true;
		}	else {
			$result = false;
		}
		
	} catch (Exception $e) {
		$result = false;
	}

	return $result;
}