OIK_Shipping::pick_smallest_rate() – Picks the right rate from available rates based on cart weight

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Description

Picks the right rate from available rates based on cart weight

If you want to set a weight at which shipping is free then set a rate for the weight at the limit, and another way above the limit to 0 e.g.

 50
100.00
 1 
 Not free up to and including 50
 1000
 X 
 1 
 Maximum weight supported is 999
If the weight is above this highest value then the most expensive rate is chosen. This is rather silly logic… but it'll do for the moment. 
We also set the countrygroup title for the selected rate. 
Usage
$- = OIK_Shipping::pick_smallest_rate( $rates_array, $weight );
Parameters
$rates_array
( mixed ) required  – 
$weight
( string ) required  – the cart weight  
Returns
- rate – may be false if no rate can be determined  
Source
File name: oik-weightcountry-shipping/oik-weightcountry-shipping.php
Lines: 
1 to 34 of 34
    function pick_smallest_rate( $rates_array, $weight) {
      $rate = null;
      $max_rate = false;
      $found_weight = -1;
      $found = false;
      
      
      if ( sizeof( $rates_array ) > 0) {
        $rates = $this->sort_ascending( $rates_array );
        //bw_trace2( $rates, "rates" );
        foreach ( $rates as $key => $value) {
          if ( $weight <= $value[0] && ( $found_weight < $weight ) ) {
            if ( true || null === $rate || $value[1] < $rate ) {
              $rate = $value[1];
              //bw_trace2( $rate, "rate is now", false );
              $found_weight = $value[0];
              $found = true;
              $this->set_countrygroup_title( $value );
            }   
          }
          if ( !$found  ) {
            if ( !$max_rate || $value[1] > $max_rate ) {
              $max_rate = $value[1];
              $this->set_countrygroup_title( $value );
            }
          }   
        }
      }
      if ( null === $rate ) {
        $rate = $max_rate;
        //$rate = false;
      }  
      return $rate;
    }
 
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