added conditional SQL

examples/sql-condition.php

@@ -0,0 +1,57 @@
+<style>
+pre.dibi { padding-bottom: 10px; }
+</style>
+<pre>
+<?php
+
+require_once '../dibi/dibi.php';
+
+
+// mysql
+dibi::connect(array(
+    'driver'   => 'mysqli',
+    'host'     => 'localhost',
+    'username' => 'root',
+    'password' => 'xxx',  // change to real password!
+    'charset'  => 'utf8',
+));
+
+
+$user = NULL;
+// or
+$user = 'Jesus';
+
+
+dibi::test('
+SELECT *
+FROM [test]
+WHERE %if', isset($user), 'user=%s', $user, '%end' // last end is optional
+);
+
+
+$cond = rand(0,2) < 1; 
+
+dibi::test('
+SELECT *
+FROM %if', $cond, '[one_table]', '%else', '[second_table]', '%end'
+);
+
+
+// shorter way
+dibi::test('
+SELECT *
+FROM %if', $cond, '[one_table] %else', '[second_table] %end'
+);
+
+
+// nested condition
+dibi::test('
+SELECT *
+FROM [test]
+WHERE 
+    %if', isset($user), 'user=%s', $user, '
+        %if', $cond, 'AND [admin]=1 %end', '
+    AND [visible]=1 %end'
+);
+
+?>