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PHP Manual
Output Control
Installing/Configuring
Predefined Constants
Output Buffering
Flushing System Buffers
User-Level Output Buffers
Examples
Output Control Functions
Output rewrite usage
flush
Output Control
Last updated: Mon, 26 Oct 2026
Output Control Functions
See Also
See also
header()
and
setcookie()
.
Table of Contents
flush
— Flush system output buffer
ob_clean
— Clean (erase) the contents of the active output buffer
ob_end_clean
— Clean (erase) the contents of the active output buffer and turn it off
ob_end_flush
— Flush (send) the return value of the active output handler and turn the active output buffer off
ob_flush
— Flush (send) the return value of the active output handler
ob_get_clean
— Get the contents of the active output buffer and turn it off
ob_get_contents
— Return the contents of the output buffer
ob_get_flush
— Flush (send) the return value of the active output handler, return the contents of the active output buffer and turn it off
ob_get_length
— Return the length of the output buffer
ob_get_level
— Return the nesting level of the output buffering mechanism
ob_get_status
— Get status of output buffers
ob_implicit_flush
— Turn implicit flush on/off
ob_list_handlers
— List all output handlers in use
ob_start
— Turn on output buffering
output_add_rewrite_var
— Add URL rewriter values
output_reset_rewrite_vars
— Reset URL rewriter values
Output rewrite usage
flush
Output Control
Last updated: Mon, 26 Oct 2026