Date() finding yesterday

[John Taylor-Johnston <John.Taylor-Johnston@xxxxxxxxxxxxxxxxxxxxx>]

I cannot seem to get this right. How can I produce yesterday?

$today = date("Y-m-d");
$yesterday = date("Y-m-") . date("d")-1;
$yesterday = date("Y-m-d")-1;
$yesterday = date("Y-m-"."d"-1);

I've been looking at the manual :) ...

Thanks,
John

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