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In response to
"read a last updated timestamp from somewhere (first line of that file or from a separate file)"
by
zork
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Humor me while I think this out...
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I have a record in a database with a lastmodified() field. Every time I modified the record, this value changes. In the AJAX code, I have a $last and $new_last variable. If they don't match, then reload the DIV second, then $last is assigned the value of $new_last. And then don't reload again until $last and $new_last don't match again... Now, all I need is a database.
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