What I want is that all code before the sleep command gets executed, and 10 secs later, the above gets fired. (here´s where the other users are being informedīut sadly all the code in the whole php script is not executed till after the 10 seconds sleep. $newtime = $sql->fetch(PDO::FETCH_COLUMN)
$sql =$conn->prepare ("SELECT time FROM Users WHERE username = ? limit 1")
the featured image for this and last 2 posts were made with a new webtool I built: CSS. It is not very accurate if we talk about nanoseconds but the results are satisfatory. Follow Alec Baldwin's ABC: always be closing and replace closing by coding :) 2. This is an alternative function to sleepnanosecond that you can use with PHP versions below PHP 5.0. This is a small feature, but it taught me a few valuable things about PHP and Javascript. $oldtime = $sql->fetch(PDO::FETCH_COLUMN) to learn to code: practice, fail, get better by doing, it takes time and effort. So this is what I did, at the end of the script: $sql =$conn->prepare ("SELECT time FROM Users WHERE username = ? limit 1") So I thought that if the php script that is called by the app each 5 seconds checks for whether if the timestamp in the sql table at the time the php script is called is the same 10 seconds later, then the other users will be told that he´s gone offline. This is done easily for situations where the user decides to logoff in the application, but if the users wifi goes down, for instance, obviously the app won´t be able to tell the other users that he´s no longer online.Įach 5 secs, there´s a check done by the app for new messages, which also updates a mysql with a current timestamp for each user. Here, the first timestamp printed is 11:04:58.Then, the sleep() function halts the program for five seconds. Scope: This is a messenger system where you want that other users are made aware whenever a user logs off. Which is actually the parent part after the fork has been completed, so that branch will actually execute every time.This could be done with a cronjob, but since I have not yet changed over to a provider with a plan including the same, I came up with what I think might be a possible workaround to my objective, if not even an actually better solution. Something like this might work: $timeLeft = 60 Īlso please note, in your original code you have a comment stating: // If you're here, something is totally f***ed up. On linux machines the return value will be the remaining seconds to sleep, so you could put the sleep in a loop and sleep until the remaining seconds is 0, or if there was an other type of error (which is signalled by a FALSE response) You can check the return value of sleep to determine whether there was a signal that interrupted it, or not, but I guess it does exit on the SIGCHLD. Other than that, I think theyre identical. One of the signal it might receive is when the child is killed during execution ( SIGCHLD). 5 Answers Sorted by: 43 The argument to sleep is seconds, the argument to usleep is microseconds. Your other options are timenanosleep which takes both seconds and freaking nanoseconds (one billion of which are one second), and timesleepuntil, which will sleep until a particular unix timestamp has been reached. Sleep can be interrupted by signals, in which case it will return the remaining seconds and doesn't continue. usleep(100000) will sleep for one tenth of one second. may be longer than microseconds) by any system activity or by the time spent processing the call or by the granularity of system timers. Sleep(60) // test every 60 seconds (if childs are available!)Įcho " WAKING UP LOOP: $loop\n" Note: The sleep may be lengthened slightly (i.e. Let us print the time after a delay of 15 seconds. Sleep(1) // avoid segmentation fault, when fork ends before handling signalsĮcho " GOING TO SLEEP ON LOOP: $loop\n" Better alternative for PHP sleep: use a dotted progress bar with, This setting you can know by increasing the sleep time till the set value of execution time at server. If($result) echo " OK - $req_time\n" Įlse echo " ERROR - $req_time\n" $req_time = microtime(true) - $req_start $result = file_get_contents($url,NULL,$ctx) If you're here, something is totally messed up. If($rec_id > 999999) $rec_id = 1 // limit rec_id, so it wouldn't cause an out of bounds error Pcntl_signal(SIGCHLD, "sig_handler") // register fork signal handler to count running childrenĮcho " ENTERING LOOP:$loop\n" 'timeout' => 30 // half of time between requests only stops when child limit is reached (that is in this case - never). PHPEOL sleep(3) // Pause the script for 3 seconds echo 'End: '. Any idea why? It does execute sleep line (as when I do some echo there, it does appear), but doesn't stop for those 60 seconds. it supposed to ask all servers from the list every 60 seconds. My script to check if HTTP servers are responding.
0 kommentar(er)
