预定义常量

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.