add strtolower and is_Dir

Author: BaseMax

is_dir.php

@@ -0,0 +1,32 @@
+<?php
+// is_dir
+if (is_dir("/tmp")) {
+    echo "/tmp is a directory\n";
+} else {
+    echo "/tmp is not a directory\n";
+}
+
+if (is_dir("/etc/passwd")) {
+    echo "/etc/passwd is a directory\n";
+} else {
+    echo "/etc/passwd is not a directory\n";
+}
+
+if (is_dir("../")) {
+    echo "../ is a directory\n";
+} else {
+    echo "../ is not a directory\n";
+}
+
+if (is_dir("c:\\xampp\htdocs\\")) {
+    echo "\"c:\\xampp\\htdocs\" is a directory\n";
+} else {
+    echo "\"c:\\xampp\\htdocs\" is not a directory\n";
+}
+
+if (is_dir("c:\\xampp\htdocs\\TopPHPFunctions\is_dir.php")) {
+    echo "\"c:\\xampp\\htdocs\\TopPHPFunctions\\is_dir.php\" is a directory\n";
+} else {
+    echo "\"c:\\xampp\\htdocs\\TopPHPFunctions\\is_dir.php\" is not a directory\n";
+}
+

strtolower.php

@@ -0,0 +1,9 @@
+<?php
+// strtolower
+$a = "HELLO WORLD";
+$b = strtolower($a);
+echo $b;
+
+$a = "hello world";
+$b = strtolower($a);
+echo $b;