An error occurs when reading the contents of a newly created temporary file

Question

<?php
//Create a temporary file
$lsfile = tmpfile();

//Write data into it
$lsshuju = fwrite($lsfile, '111Here is the data written to the temporary file');

//Output writing situation
echo 'Write ' . $lsshuju . ' characters to the temporary file<br>' ;

//Output the contents of the temporary file
$shuchu = file_get_contents($lsfile);
echo $shuchu;

//Close the temporary file
fclose($ lsfile);
?>

An error is reported when reading the content. How can I read the content correctly?

Answer 1

What is wrong with the report