Predefined Constants

The constants below are always available as part of the PHP core.

PHP_OUTPUT_HANDLER_START (integer)

Indicates that output buffering has begun.

PHP_OUTPUT_HANDLER_WRITE (integer)

Indicates that the output buffer is being flushed, and had data to output.

Available since PHP 5.4.

PHP_OUTPUT_HANDLER_FLUSH (integer)

Indicates that the buffer has been flushed.

Available since PHP 5.4.

PHP_OUTPUT_HANDLER_CLEAN (integer)

Indicates that the output buffer has been cleaned.

Available since PHP 5.4.

PHP_OUTPUT_HANDLER_FINAL (integer)

Indicates that this is the final output buffering operation.

Available since PHP 5.4.

PHP_OUTPUT_HANDLER_CONT (integer)

Indicates that the buffer has been flushed, but output buffering will continue.

As of PHP 5.4, this is an alias for PHP_OUTPUT_HANDLER_WRITE.

PHP_OUTPUT_HANDLER_END (integer)

Indicates that output buffering has ended.

As of PHP 5.4, this is an alias for PHP_OUTPUT_HANDLER_FINAL.

PHP_OUTPUT_HANDLER_CLEANABLE (integer)

Controls whether an output buffer created by ob_start can be cleaned.

Available since PHP 5.4.

PHP_OUTPUT_HANDLER_FLUSHABLE (integer)

Controls whether an output buffer created by ob_start can be flushed.

Available since PHP 5.4.

PHP_OUTPUT_HANDLER_REMOVABLE (integer)

Controls whether an output buffer created by ob_start can be removed before the end of the script.

Available since PHP 5.4.

PHP_OUTPUT_HANDLER_STDFLAGS (integer)

The default set of output buffer flags; currently equivalent to PHP_OUTPUT_HANDLER_CLEANABLE | PHP_OUTPUT_HANDLER_FLUSHABLE | PHP_OUTPUT_HANDLER_REMOVABLE.

Available since PHP 5.4.