diff --git a/src/data_types.php b/src/data_types.php
new file mode 100644
index 0000000..a5f9cb8
--- /dev/null
+++ b/src/data_types.php
@@ -0,0 +1,64 @@
+<?php
+function convert_to_int($dataIn){
+	settype($dataIn, "integer");
+	return $dataIn;
+}
+
+function convert_to_float($dataIn){
+	settype($dataIn, "float");
+	return $dataIn;	
+}
+
+function convert_to_string($dataIn) {	
+	if(is_array($dataIn)){//if $dataIn is an array
+		$data = array_map("convert_to_string", $dataIn);//recursion, the function calling itself 
+		$dataOut = implode(', ', $data); //convert array to string	
+	}else{	//if $dataIn is not an array
+		$dataOut = $dataIn;
+		settype($dataOut, "string");
+	}
+	return $dataOut;		
+}
+
+function convert_to_bool($dataIn){
+	settype($dataIn, "boolean");
+	return $dataIn;	
+}
+
+function convert_to_array($dataIn){
+	settype($dataIn, "array");
+	return $dataIn;		
+}
+
+
+function convert_to_null($dataIn){
+	if(!$dataIn || $dataIn === 'null'){
+		return null;
+	} else {
+		return $dataIn;
+	}
+}
+
+/*
+//input data
+$input = ['null', null];
+echo "The input data is: ";
+var_dump($input);
+
+
+
+//output data
+echo "</br> After the input is converted, the output data is: ";
+//$output = convert_to_int($input);//convert to integer
+//$output = convert_to_float($input);//convert to float
+//$output = convert_to_string($input);//convert to string
+//$output = convert_to_bool($input);//convert to boolean
+//$output = convert_to_array($input);//convert to array
+$output = convert_to_null($input);//convert to null
+var_dump($output);
+
+
+//echo "</br>$output</br>";
+//var_dump ($input);
+*/
+?>
\ No newline at end of file