Add all the A tasks

Task/Associative-array-Iteration/PHP/associative-array-iteration.php

@@ -0,0 +1,20 @@
+<?php
+$pairs = array( "hello" => 1,
+		"world" => 2,
+		"!"     => 3 );
+
+// iterate over key-value pairs
+foreach($pairs as $k => $v) {
+  echo "(k,v) = ($k, $v)\n";
+}
+
+// iterate over keys
+foreach(array_keys($pairs) as $key) {
+  echo "key = $key, value = $pairs[$key]\n";
+}
+
+// iterate over values
+foreach($pairs as $value) {
+  echo "values = $value\n";
+}
+?>