![]() This means that data written to the output buffer will not show up until a certain amount of the buffer has been filled. Both functions are supported by PHP 4 and. It's in seconds rather than microseconds (it's intended for heavy-duty CLI scripts), but that could easily be changed by using microtime(true) and usleep if greater granularity was required. First problem is that stuff you write to the PHP output buffer is normally not sent to the browser immediately, it is buffered on the server for performance reasons. The sleep() function will delay the scripts execution in seconds while usleep() will delay it in microseconds. Obviously the empty loop consumed 99 of the CPU, sleep used 0, usleep used ms and 6 for 100ms, and timenanosleep used 0 for both 500ms and 1000ms. ![]() Note: In order to delay program execution for a fraction of a second, use usleep () as the sleep () function expects an int. I used a loop with just a call to sleep/usleep/timenanosleep, and compared them all with an empty loop. Logging extra shuteye not only improves your performance, but boosts your mood, too. sleep (PHP 4, PHP 5, PHP 7, PHP 8) sleep Delay execution Description sleep ( int seconds ): int Delays the program execution for the given number of seconds. ![]() Not realising that this function existed, I wrote something similar, but it has the additional facility to specify a minimum pause even if the target time has already been reached, for instance in a processor-intensive loop. This was the same on PHP 5.3.29 and 5.5.29. Getting Started Introduction A simple tutorial Language Reference Basic syntax Types Variables Constants Expressions Operators Control Structures Functions Classes and Objects Namespaces Enumerations Errors Exceptions Fibers Generators Attributes References Explained Predefined Variables Predefined Exceptions Predefined Interfaces and Classes Predefined Attributes Context options and parameters Supported Protocols and Wrappers Security Introduction General considerations Installed as CGI binary Installed as an Apache module Session Security Filesystem Security Database Security Error Reporting User Submitted Data Hiding PHP Keeping Current Features HTTP authentication with PHP Cookies Sessions Dealing with XForms Handling file uploads Using remote files Connection handling Persistent Database Connections Command line usage Garbage Collection DTrace Dynamic Tracing Function Reference Affecting PHP's Behaviour Audio Formats Manipulation Authentication Services Command Line Specific Extensions Compression and Archive Extensions Cryptography Extensions Database Extensions Date and Time Related Extensions File System Related Extensions Human Language and Character Encoding Support Image Processing and Generation Mail Related Extensions Mathematical Extensions Non-Text MIME Output Process Control Extensions Other Basic Extensions Other Services Search Engine Extensions Server Specific Extensions Session Extensions Text Processing Variable and Type Related Extensions Web Services Windows Only Extensions XML Manipulation GUI Extensions Keyboard Shortcuts ? This help j Next menu item k Previous menu item g p Previous man page g n Next man page G Scroll to bottom g g Scroll to top g h Goto homepage g s Goto search
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