How to Use PHP’s tmpfile() to Create and Manage Temporary Files

In PHP programming, handling files is common, and sometimes you need a temporary file without keeping it long‑term; the tmpfile() function creates such a file.

The tmpfile() function is a PHP filesystem function that creates a uniquely named temporary file, which is automatically deleted when closed or when the script ends, so it does not occupy persistent disk space. resource tmpfile ( void ) The function takes no parameters and returns a temporary file handle that can be used for reading and writing.

Example:

<?php
$file = tmpfile(); // create a temporary file
if ($file) {
    fwrite($file, 'Hello, World!'); // write data
    fseek($file, 0); // rewind to start
    echo fread($file, filesize($file)); // read and output
    fclose($file); // close and delete the temporary file
}
?>

In the example, tmpfile() creates a temporary file stored in $file. fwrite() writes a string, fseek() moves the pointer to the beginning, fread() reads the data, and fclose() closes and removes the file.

Note that the handle returned by tmpfile() is a resource type, which can be used with other file functions such as fwrite(), fseek(), and fclose().

Additionally, the temporary file is automatically deleted when the script finishes; if you need to delete it manually at any time, you can call unlink().

In summary, tmpfile() is a convenient PHP filesystem function for creating temporary files without specifying a name or path, useful for short‑lived operations, but remember the file only exists during script execution.