optimize the code in terminal.php;

commands/cd.php

@@ -1,8 +1,8 @@
 <?php
 function cd($commands)
 {
-    if(sizeof($commands)>2){
-        file_put_contents("recent.txt", "Too many arguments.<br/>", FILE_APPEND);
+    if (sizeof($commands) > 2) {
+        file_put_contents("recent.txt", "Invalid number of arguments.<br/>", FILE_APPEND);
         return;
     }
     $pwd = file_get_contents("pwd.txt");
@@ -23,4 +23,3 @@ function cd($commands)
         }
     }
 }
-?>

commands/clear.php

@@ -0,0 +1,9 @@
+<?php
+function clear($commands)
+{
+    if (sizeof($commands) == 1) {
+        file_put_contents("recent.txt", "");
+    } else {
+        file_put_contents("recent.txt", "Invalid number of arguments.<br/>", FILE_APPEND);
+    }
+}

commands/help.php

@@ -0,0 +1,12 @@
+<?php
+function help($commands)
+{
+    $help = file_get_contents("static/terminal.php/help.txt");
+    if (sizeof($commands) == 1) {
+        file_put_contents("recent.txt", $help, FILE_APPEND);
+    } else if (sizeof($commands) == 2 && file_get_contents("static/help/$commands[1].txt") != NULL) {
+        file_put_contents("recent.txt", file_get_contents("static/help/$commands[1].txt"), FILE_APPEND);
+    } else {
+        file_put_contents("recent.txt", "Invalid number of arguments.<br/>", FILE_APPEND);
+    }
+}

commands/mkdir.php

@@ -0,0 +1,16 @@
+<?php
+function mdir($commands)
+{
+    $pwd = file_get_contents("pwd.txt");
+    if (sizeof($commands) == 2) {
+        if (!opendir("fileroot" . $pwd . "/" . $commands[1])) {
+            if (!mkdir("fileroot" . $pwd . "/" . $commands[1])) {
+                file_put_contents("recent.txt", "Error creating directory.No permissions?<br/>", FILE_APPEND);
+            }
+        } else {
+            file_put_contents("recent.txt", "Directory already exists.<br/>", FILE_APPEND);
+        }
+    } else {
+        file_put_contents("recent.txt", "Invalid number of arguments.<br/>", FILE_APPEND);
+    }
+}

commands/pwd.php

@@ -0,0 +1,10 @@
+<?php
+function pwd($commands)
+{
+    $pwd = file_get_contents("pwd.txt");
+    if (sizeof($commands) == 1) {
+        file_put_contents("recent.txt", $pwd . "<br/>", FILE_APPEND);
+    } else {
+        file_put_contents("recent.txt", "Invalid number of arguments.<br/>", FILE_APPEND);
+    }
+}

commands/rm.php

@@ -20,7 +20,7 @@ function rm($commands)
         } else {
             file_put_contents("recent.txt", "Not a directory.<br/>", FILE_APPEND);
         }
-    } else {
+    } else if (sizeof($commands) == 2) {
         if (is_dir("fileroot" . $pwd . "/" . $commands[1])) {
             file_put_contents("recent.txt", "Is a directory.<br/>Try rm -r<br/>", FILE_APPEND);
         } else {
@@ -30,6 +30,7 @@ function rm($commands)
                 file_put_contents("recent.txt", "Error deleting.<br/>", FILE_APPEND);
             }
         }
+    } else {
+        file_put_contents("recent.txt", "Invalid number of arguments.<br/>", FILE_APPEND);
     }
 }
-?>