(PHP 4 >= 4.3.0, PHP 5, PHP 7) List all output handlers in use
(PHP 4 >= 4.3.0, PHP 5, PHP 7) Flush the output buffer, return it as a string and turn off output buffering
(PHP 4 >= 4.0.4, PHP 5, PHP 7) ob_start callback function to gzip output buffer
(PHP 4 >= 4.3.0, PHP 5, PHP 7) Get current buffer contents and delete current output buffer
(PHP 4 >= 4.2.0, PHP 5, PHP 7) Return the nesting level of the output buffering mechanism
(PHP 4, PHP 5, PHP 7) Turn on output buffering
(PHP 4, PHP 5, PHP 7) Clean (erase) the output buffer and turn off output buffering
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