![]() ![]() Time space trade off for using the usleep function is constant as there is no major changes or data structure involving pointer transitions or external manipulation.This function passes an argument or parameter that is a mandatory element of the entire function without which execution of a function is not possible and useless.usleep function is a function in PHP related to time which is used for bringing the entire process in execution to halt according to the passed parameter to the function which can be either in milliseconds or microseconds depending upon the requirement of the user or implementor.Let’s see the working flow of usleep function which is as follows : Usleep function() is an inbuilt function in PHP which is used to make the entire process in execution to halt for some microseconds or milliseconds. There is no return type only makes the function in execution to halt for a certain interval of time as mentioned. Passing of the parameter from function is a mandatory approach. That being said, though, I'll have to agree that there are very few valid use cases for sleep, and most situations could no doubt be better handled using a different approach.The syntax flow is in a way where the specified parameter needs to be passed from the function and then the function will be made available according to the requirement. I guess there's at least the off chance that what I'm doing is not entirely evil ? The Link Checker module I released some time ago (it was never quite finished, hopefully I'll get a chance to work more on it soon.ish) makes use of a crawler script that is intended to run as a background process and (u)sleeps between external requests. Reading this made me wonder if I should rethink my strategy, but a quick Google search for "is php sleep always bad" resulted in this Stack Overflow thread discussing valid use cases for sleep – and sure enough, the first one raised was "some kind of a crawler". Old thread and this is a bit off-topic, but this bit caught my attention, so I thought I'd mention it. Nowadays, websockets are also used to split off parts of the work to different processes and notify the "owning" session of changes of state in the backend. There also fine differences in buffering behaviour depending on how PHP is executed (mod_php, FastCGI, classic CGI.) The usual solution to situations where you are tempted to call sleep() is to poll until the condition you need to wait for has been reached, either using classic reloads for the current page or with AJAX. sleep() blocks the whole thread it is called in, and under heavier load, it makes servers utterly unresponsive. It's very, very bad practice to use sleep() in a server side script, that is why documentation on working around the pecularities of PHP's buffering (and thread execution) is so sparse. Note: This directive is hardcoded to Off for the CLI SAPI ![]() Integer = Enables the buffer and sets its maximum size in bytes. Note: Output buffering can also be controlled via Output Buffering Control On production servers, 4096 bytes is a good setting for performance emitting less packets due to buffered output versus PHP streaming the output ![]() You also may see performance benefits if your server is You may be able to send headers and cookies after you've already sent output interesting side-effects depending on your application and web server. Turning on this setting and managing its maximum buffer size can yield some will send that data in chunks of roughly the size you specify. If your application's output exceeds this setting, PHP (excluding headers and cookies) PHP should keep internally before pushing that Output buffering is a mechanism for controlling how much output data Oh and just for the record, this is what my hoster writes about output buffering: Things are not always as they are (simple) explained on php.net and w3schools and a lot of fuzz is behind of it.īut luckily 99% is working as they explain. I have this setting on my hoster: output_buffering = 4096Īnyways thanks everybody for stepping in on this. Same thing, all text is outputted or shown at once at the end. Hi flydev yes I tried your second code also. ![]()
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