What Output Is Buffered?

PHP's user-level output buffers buffer all output after they are started until they are turned off or the script ends. Output in the context of PHP's user-level output buffer is everything that PHP would display or send back to the browser. In practical terms, output is non-zero length data that is:

Note: Data that is written directly to stdout or passed to an SAPI function with a similar functionality will not be captured by user-level output buffers. This includes writing data to stdout with fwrite() or sending headers using header() or setcookie().

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