PHP Undefined function error

Hi, I am trying to update a php file through another php file but am receiving the following error:

Fatal error: Call to undefined function file_put_content() in c:\Inetpub\wwwroot\putcontent.php on line 5

My code below:
$my_file = "some_file.php";
$f_content = file_get_contents($my_file);
$string_data = "Lorem ipsum";
file_put_content($fh, $string_data);
<html >
<div id="my_div">

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