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下列常量作为 PHP 核心的一部分总是可用的。
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.