Initial data commit

Task/Empty-string/PHP/empty-string.php

@@ -0,0 +1,16 @@
+<?php
+
+$str = ''; // assign an empty string to a variable
+
+// check that a string is empty
+if (empty($str)) { ... }
+
+// check that a string is not empty
+if (! empty($str)) { ... }
+
+// we could also use the following
+if ($str == '') { ... }
+if ($str != '') { ... }
+
+if (strlen($str) == 0) { ... }
+if (strlen($str) != 0) { ... }