How to use `foreach` loops to work with arrays

A foreach loop that displays the values in an associative array

    
      $tax_rates = array('NC' => 7.75, 'CA' => 8.25, 'NY' => 8.875);

      echo("<ul>\n");

      foreach ($tax_rates as $rate) {

        echo("<li>$rate</li>\n");

      }

      echo("</ul>");
       -->
      7.75
8.25
8.875

A foreach loop that displays the keys and values

      
      echo("<ul>\n");

      foreach ($tax_rates as $state => $rate) {

        echo("<li>$state ($rate)</li>\n");

      }

      echo("</ul>");

      }
      
      NC (7.75)
CA (8.25)
NY (8.875)

A foreach loop that displays the values in a regular array

      
      $numbers = array(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
      unset($numbers[2], $numbers[6]);

      $numbers_string = '';

      foreach($numbers as $number) {

        $numbers_string .= $number . ' '; 

      } 

      echo($numbers_string); // Displays: 1 2 4 5 6 8 9 10
      
      1 2 4 5 6 8 9 10

You can use a foreach statement to create a foreach loop that accesses only those elements in an array that are defined.