Exercise 1 Write a PHP program that creates an associative array that contains, as elements, the names of colours of your national flag, and displays the names of the colours. The index of each colour in the array is to be the name of the colour, and the value is to be the colour expressed as a literal string. Also display the colour as a square in the appropriate colour. Do not forget to add the start and end PHP tags. Wrap the PHP code in and tags. Use the echo function to display the results