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<?php function my_cb( $a ) { return $a; } ob_start( 'my_cb', 0 ); ob_start( 'my_cb', 1 ); ob_start( 'my_cb', 2 ); $status = ob_get_status( true ); var_dump( array_combine( array_column( $status, 'chunk_size' ), array_column( $status, 'buffer_size' ) ) );

preferences:
49.33 ms | 991 KiB | 5 Q