diff --git a/data_types.php b/data_types.php
new file mode 100644
index 0000000..245f982
--- /dev/null
+++ b/data_types.php
@@ -0,0 +1,60 @@
+<?php
+//Return `0` for `convert_to_int()`
+//Return `0.0` for `convert_to_float()`
+//Return an empty string for `convert_to_string()`
+//Return `false` for `convert_to_bool()`
+//Return `[]` for `convert_to_array()`
+//Return `null` for `convert_to_null()`
+
+$input = array('', array(''));
+
+function convert_to_int($input){
+ return (int)$input;
+}
+
+
+function convert_to_float($input){
+  return (double)$input;
+}
+
+function convert_to_string($input){
+ //array to string code here should return comma seperated values in a string
+  if (is_array ($input)){
+    $length = count($input);
+    $output = "";
+
+    for($i = 0; $i < $length; $i++){
+      if($i+1 == $length) //checks if end of line removes last comma
+      {$output .= $input[$i];}
+      else{$output .= $input[$i] . ", ";}
+    }
+    return $output;
+  }
+  else{ return (string)$input;}
+  // return (string)$input;
+}
+
+function convert_to_bool($input){
+  return (bool)$input;
+}
+
+function convert_to_array($input){
+  if ($input == null){
+    return array();
+  }
+  //Test if Array return  -- else place in array
+  elseif (is_array ($input)){
+    return $input;}
+  else{
+    return array($input);}
+}
+
+function convert_to_null($input){
+  if( $input == 0 || $input == false){
+    return null;
+  }else{return true;}
+}
+
+var_dump(convert_to_array($input));
+
+?>