Invokes a hard breakpoint
function hphp_debug_break( bool $condition = true, ): bool;
This routine will break into the debugger if and only if the debugger is enabled and a debugger client is currently attached.
bool $condition = true- Optional condition. If specified, the debugger will only break if the condition evaluates to true.
bool- - TRUE if the program successfully broke in (and has since resumed), FALSE if no debugger was attached.