OIK_Shipping_Pro::pick_rates_for_weight() – Picks a selection of rates from available rates based on cart weight

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Description

Picks a selection of rates 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
Supports multiple rates for the same weight range. This allows you to use faster shipping methods Note: The weight ranges do not have to match exactly 
Usage
$- = OIK_Shipping_Pro::pick_rates_for_weight( $rates_array, $weight );
Parameters
$rates_array
( mixed ) required  – 
$weight
( string ) required  – the cart weight  
Returns
- rates – array may be empty if no rates are determined  
TO DO
Check if this is true e.g. 
To set a maximum weight, for any shipping method for a country group, use a non numeric rate. 
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 rates.  
 50 
 1.70 
 1 
 Second class
 50 
 100.00 
 1 
 Knight in shining armour
 77 
 X 
 1 
 Too heavy for this shipping method.
Source
File name: oik-weightcountry-shipping-pro/class-oik-shipping-pro.php
Lines: 
1 to 42 of 42
  function pick_rates_for_weight( $rates_array, $weight ) {
    //bw_trace2();
    $picked_rates = array();
    $max_rate = false;
    $found_weight = -1;
    $found = false;
    $higher_weight = -1;
    if ( sizeof( $rates_array ) > 0) {
      $rates = $this->sort_ascending( $rates_array );
      //bw_trace2( $rates, "rates" );
      foreach ( $rates as $key => $value) {
        $max_weight = $value[0];
        //bw_trace2( "$weight $max_weight $found_weight $higher_weight", "weights:", false );
        if ( ( $max_weight > $found_weight ) && ( $max_weight < $weight)  && ( !$found ) ) {
          $found_weight = $max_weight;
        }
        if ( $weight <= $max_weight && ( $found_weight <= $weight ) && ( $max_weight <= $higher_weight || !$found )  ) {
          $picked_rates[] = array( "rate" => $value[1]
                            , "title" => $this->set_countrygroup_title( $value )
                            ); 
          //bw_trace2( $rate, "rate is now", false );
          $found = true;
          $higher_weight = $max_weight;
          //bw_trace2( $picked_rates, "picked_rates", false );
        }
        if ( !$found  ) {
          if ( !$max_rate || ( is_numeric( $value[1] ) && $value[1] > $max_rate ) ) {
            $max_rate = $value[1];
            $this->set_countrygroup_title( $value );
          }
        }   
      }
    }
    //bw_trace2( $picked_rates, "rates" );  
    if ( count( $picked_rates ) == 0 && $max_rate ) {
      $picked_rates[] =  array( "rate" => $max_rate
                        , "title" => $this->countrygroup_title
                        );
    }
    return( $picked_rates );
  }
 

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