diff --git a/about/index.html b/about/index.php
similarity index 100%
rename from about/index.html
rename to about/index.php
diff --git a/fun/index.html b/fun/index.php
similarity index 100%
rename from fun/index.html
rename to fun/index.php
diff --git a/header.html b/header.html
deleted file mode 100644
index 71713ec..0000000
--- a/header.html
+++ /dev/null
@@ -1,8 +0,0 @@
-
diff --git a/index.php b/index.php
index 78e7662..f354499 100644
--- a/index.php
+++ b/index.php
@@ -4,16 +4,7 @@
-
+
Hello World'; ?>
Welcome to my page.
diff --git a/library/index.html b/library/index.php
similarity index 100%
rename from library/index.html
rename to library/index.php
diff --git a/notes/calculus.html b/notes/calculus.php
similarity index 100%
rename from notes/calculus.html
rename to notes/calculus.php
diff --git a/notes/circuits.html b/notes/circuits.php
similarity index 100%
rename from notes/circuits.html
rename to notes/circuits.php
diff --git a/notes/cpp.html b/notes/cpp.php
similarity index 100%
rename from notes/cpp.html
rename to notes/cpp.php
diff --git a/notes/index.html b/notes/index.php
similarity index 100%
rename from notes/index.html
rename to notes/index.php
diff --git a/notes/physics.html b/notes/physics.php
similarity index 100%
rename from notes/physics.html
rename to notes/physics.php
diff --git a/snippet/footer.php b/snippet/footer.php
new file mode 100644
index 0000000..e69de29
diff --git a/snippet/header.php b/snippet/header.php
new file mode 100644
index 0000000..9eba6c4
--- /dev/null
+++ b/snippet/header.php
@@ -0,0 +1,10 @@
+