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 (int)

Indicates that output buffering has begun.

PHP_OUTPUT_HANDLER_WRITE (int)

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

PHP_OUTPUT_HANDLER_FLUSH (int)

Indicates that the buffer has been flushed.

PHP_OUTPUT_HANDLER_CLEAN (int)

Indicates that the output buffer has been cleaned.

PHP_OUTPUT_HANDLER_FINAL (int)

Indicates that this is the final output buffering operation.

PHP_OUTPUT_HANDLER_CONT (int)

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

This is an alias for PHP_OUTPUT_HANDLER_WRITE.

PHP_OUTPUT_HANDLER_END (int)

Indicates that output buffering has ended.

This is an alias for PHP_OUTPUT_HANDLER_FINAL.

PHP_OUTPUT_HANDLER_CLEANABLE (int)

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

PHP_OUTPUT_HANDLER_FLUSHABLE (int)

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

PHP_OUTPUT_HANDLER_REMOVABLE (int)

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

PHP_OUTPUT_HANDLER_STDFLAGS (int)

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