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蛁: you may find that your pages aren't cached even if you don't output all of the headers above. there are a number of options that users may be able to set for their browser that change its default caching behavior. by sending the headers above, you should override any settings that may otherwise cause the output of your script to be cached.
there are a number of options that users may be able to set for their browser that change its default caching behavior.

?php $a = 4; $b = 9; $c = 3; $arr = array(99, 34, 11); // you may want to implement your own error checking in // case of failure (a variable may not be set) if (!$min_value = @min($a, $b, $c)) {echo "could not get min value, please try again.";} else {echo "min value is $min_value";} print min($arr); // 11?
?php $a = 4; $b = 9; $c = 3; $arr = array(99, 34, 11); / / you may want to implement your own error checking in / / case of failure (a variable may not be set) if (!$min_value = @min($a, $b, $c)) {echo "could not get min value, please try again .";} else {echo "min value is $min_value";} print min($arr); / / 11?