Initial commit for public repo

code/boolean-logic.php

@@ -0,0 +1,35 @@
+<?php
+
+// Boolean logic is used to combine booleans to return another boolean.
+
+// Using double ampersands tells PHP to check if both values are true.
+// If so, it will return true. If not, it will return false.
+$a = true;
+$b = true;
+$c = false;
+
+// Returns true.
+$a && $b;
+// Returns false.
+$a && $c;
+
+// Using two pipe characters checks if either value is true.
+// Then, it will return true. If both values are false, the PHP
+// returns false.
+$a = true;
+$b = false;
+$c = false;
+$d = true;
+
+// Returns true.
+$a || $b;
+// Returns false.
+$b || $c;
+// Returns true.
+$a || $d;
+
+// Using an exclamation point returns the value flipped.
+$d = true;
+
+// Outputs false.
+echo !$d;