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by vinaymalik
                                        
                                                  With associative arrays we can use the values as keys and assign values to them.
                              Example 1
                              In this example we use an array to assign ages to the different persons:
                              $ages = array("Peter"=>32, "Quagmire"=>30, "Joe"=>34);      Example 2
                              This example is the same as example 1, but shows a different way of creating the array:
                              $ages['Peter'] = "32";
                              $ages['Quagmire'] = "30";
                              $ages['Joe'] = "34";      The ID keys can be used in a script:
                              <?php
                              $ages['Peter'] = "32";
                              $ages['Quagmire'] = "30";
                              $ages['Joe'] = "34";
                              echo "Peter is " . $ages['Peter'] . " years old.";
                              ?>      The code above will output:
                              Peter is 32 years old.      
                              Multidimensional Arrays
                              In a multidimensional array, each element in the main array can also be an array. And each element in the sub-array can be an array, and so on.
                              Example
                              In this example we create a multidimensional array, with automatically assigned ID keys:
                              $families = array
                                "Griffin"=>array
                                "Peter",
                                "Lois",
                                "Megan"
                                ),
                                "Quagmire"=>array
                                "Glenn"
                                ),
                                "Brown"=>array
                                "Cleveland",
                                "Loretta",
                                "Junior"
                              );      The array above would look like this if written to the output:
                              Array
                              [Griffin] => Array
                                [0] => Peter
                                [1] => Lois
                                [2] => Megan
                              [Quagmire] => Array
                                [0] => Glenn
                              [Brown] => Array
                                [0] => Cleveland
                                [1] => Loretta
                                [2] => Junior
                              )       Example 2
                              Lets try displaying a single value from the array above:
                              echo "Is " . $families['Griffin'][2] . 
                              " a part of the Griffin family?";      The code above will output:
                              Is Megan a part of the Griffin family?      Looping
                              Very often when you write code, you want the same block of code to run a number of times. You can use looping statements in your code to perform this.
                              In PHP we have the following looping statements:
                              while - loops through a block of code if and as long as a specified condition is true