Php/docs/outcontrol.constants
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.
Available since PHP 5.4.
PHP_OUTPUT_HANDLER_FLUSH(int)Indicates that the buffer has been flushed.
Available since PHP 5.4.
PHP_OUTPUT_HANDLER_CLEAN(int)Indicates that the output buffer has been cleaned.
Available since PHP 5.4.
PHP_OUTPUT_HANDLER_FINAL(int)Indicates that this is the final output buffering operation.
Available since PHP 5.4.
PHP_OUTPUT_HANDLER_CONT(int)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(int)Indicates that output buffering has ended.
As of PHP 5.4, 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.
Available since PHP 5.4.
PHP_OUTPUT_HANDLER_FLUSHABLE(int)Controls whether an output buffer created by ob_start() can be flushed.
Available since PHP 5.4.
PHP_OUTPUT_HANDLER_REMOVABLE(int)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(int)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.
