I'm adding the following:
<?php ob_start( 'ob_gzhandler' ); ?>
To a file to enable gzip compression.
Should it go before the DTD, or between it and the <html>开发者_如何学运维; tag?
Before all data sent to browser ^^
It has to go before the DTD and any other output. The < of <?php must be the absolute first byte of the file otherwise there is literal output before it (even if that's only whitespace, or a UTF-8 fake-BOM emitted by a misguided Windows text editor).
Any <!DOCTYPE> declaration in a .php file is just pure output text, something that applies to the returned HTML page and not the PHP file itself (as PHP is neither HTML nor XML).
![Interactive visualization of a graph in python [closed]](https://www.devze.com/res/2023/04-10/09/92d32fe8c0d22fb96bd6f6e8b7d1f457.gif)
加载中,请稍侯......
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