PHP browser cache operations

The header () function in PHP sends a specific cache to control the original HTTP header. The header () must be called before any actual output, whether it is from a common HTML Tag, empty line, or PHP. In a Chinese environment, a full-width space will also lead to hard-to-find errors.

The Code is as follows:

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<? Php // The following statement sets the expiration time of this page (expressed by Greenwich Mean Time), as long as it is a date that has passed. Header ("Expires: Mon, 26 Jul 1970 05:00:00 GMT "); // The following statement sets the last update date (expressed by Greenwich Mean Time) on this page to the current day, and forces the browser to obtain the latest information. Header ("Last-Modified:". gmdate ("D, d m y h: I: s"). "GMT "); // Tell the client browser not to use the cache, HTTP 1.1 protocol Header ("Cache-Control: no-cache, must-revalidate "); // Tells the client browser not to use the cache and is compatible with the HTTP 1.0 Protocol Header ("Pragma: no-cache "); ?>