PHP - Email notification whenever a remote file changes

Question

I was wondering if there\'s a way to have a php script on my web server email me whenever a file from another web server changes.

For instance, there\'s this file t

Answer 1

Use crontab to setup checking script to run once a minute and compare this file with your locally stored version (or use md5 checksums instead - it will differ if file changes).

file_get_contents('http://url-to-file', 'checkfile.tmp');
if (md5(file_get_contents('lastfile.tmp')) != md5(file_get_contents('checkfile.tmp')))
{
    //copy checkfile to lastfile
    unlink('lastfile.tmp');
    copy('checkfile.tmp', 'lastfile.tmp'); 
    //send email or do something you want ;)
}