Hash tables for PHP (#39)

05_hash_tables/php/01_price_of_groceries.php

@@ -0,0 +1,10 @@
+<?php
+
+$book = [];
+// an apple costs 67 cents
+$book['apple'] = 0.67;
+// milk costs $1.49
+$book['milk'] = 1.49;
+$book['avocado'] = 1.49;
+
+var_dump($book);

05_hash_tables/php/02_check_voter.php

@@ -0,0 +1,18 @@
+<?php
+
+$voted = [];
+
+function check_voter($name)
+{
+    global $voted;
+    if (isset($voted[$name])) {
+        print "kick them out!\n";
+    } else {
+        $voted[$name] = true;
+        print "let them vote!\n";
+    }
+}
+
+check_voter("tom"); // let them vote!
+check_voter("mike"); // let them vote!
+check_voter("mike"); // kick them out!