add more unit tests; re-enable random_int warning in functions.inc.php for old php versions etc etc

tests/RemoveFromArrayTest.php

@@ -0,0 +1,23 @@
+<?php
+
+require_once('common.php');
+
+class RemoveFromArrayTest extends \PHPUnit\Framework\TestCase {
+    public function testBasic() {
+        $list = array('a','b','c','d');
+
+        list($found, $new) = remove_from_array($list, 'd');
+        $this->assertEquals(1, $found);
+        $this->assertEquals(array('a','b','c'), $new);
+
+        list($found, $new) = remove_from_array($list, 'a');
+        $this->assertEquals(1, $found);
+        $this->assertEquals(array(1 => 'b',2 => 'c',3=>'d'), $new);
+
+        list($found, $new) = remove_from_array($list, 'x');
+        $this->assertEquals(0, $found);
+        $this->assertEquals(array('a','b','c','d'), $new);
+    }
+}
+
+/* vim: set expandtab softtabstop=4 tabstop=4 shiftwidth=4: */