Check postcode

class-wcvendors-pro-shipping.php

<?php 

public static function check_postcode( $customer_postcode, $rate_postcode ){ 

		// clean both codes before doing anything to them 
		$customer_postcode 	= strtolower( str_replace( ' ', '', $customer_postcode ) ); 
		$rate_postcode 		= strtolower( str_replace( ' ', '', $rate_postcode ) ); 

		$postcode_length = strlen( $customer_postcode ); 

		// single post code to check? 
		if ( $customer_postcode == $rate_postcode ) return true; 

		// wildcard postcode ? 
		$wildcard_position = strpos( $rate_postcode, '*' ); 

		// The rate has a wildcard match only the beginning of both 
		if ( $wildcard_position > 0 ){ 

			$customer_postcode_start 	= substr( $customer_postcode, 0, $wildcard_position ); 
			$rate_postcode_start 		= substr( $rate_postcode, 0, $wildcard_position ); 

			return ( $customer_postcode_start === $rate_postcode_start ) ? true : false; 
			
		}

		// check if the rate contains a range 
		$range_position = strpos( $rate_postcode, '-' ); 

		// postcode range set 
		if ( $range_position > 0 ){ 

			$range = array_map( 'trim', explode( apply_filters( 'wcv_shipping_postcode_range_separator', '-' ), $rate_postcode ) );

			$min_postcode = ( is_numeric( $range[ 0 ] ) ) ? $range[ 0 ] : make_numeric_postcode( $range[ 0 ] ); 
			$max_postcode = ( is_numeric( $range[ 1 ] ) ) ? $range[ 1 ] : make_numeric_postcode( $range[ 1 ] ); 

			// check if the ranges are the same size as the customer postcode 
			if ( $postcode_length != strlen( $min_postcode ) ) return false; 

			// Check to see if the postcode is in the range using filter_var 

			$in_range = filter_var(
			    $customer_postcode, 
			    FILTER_VALIDATE_INT, 
			    array(
			        'options' => array(
			            'min_range' => $min_postcode, 
			            'max_range' => $max_postcode
			        )
			    )
			);

			// if there is a number in the range return what it finds 
			return is_int( $in_range ); 

		}

		return false; 

	} // check_postcode()