ob_start（）
turn on output buffering
bool ob_start ([ callable $output_callback = NULL [, int $chunk_size = 0 [, int $flags = PHP_OUTPUT_HANDLER_STDFLAGS ]]] )
ob_get_contents( )
Return the contents of the output buffer
ob_end_flush( )
Flush(send) the output buffer and turn off output buffer.
ob_gzhandler
ob_start callback function to gzip output buffer
Note:
You cannot use both ob_gzhandler() and zlib.output_compression. Also note that using zlib.output_compression is preferred over ob_gzhandler().
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