php中的echo命令没有被执行

Question

echo command is not getting executed.

echo "<script>alert('Attendence Updated')</script>";
header("location: http://localhost/classroom/adminportal.php");

Answer 1

If you want to print a message to the user before redirecting, you cannot use header( 'Location: ...' ) , because you cannot send any output before the headers are sent.

You could use following:

<?php
header("refresh:0; url=http://localhost/classroom/adminportal.php");
echo "<script>alert('Attendence Updated')</script>";