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Php sleep every so many loops9/11/2023 If you ever wanted to write a while loop in the Bourne shell, I hope this serves as a simple example. Linux shell script while loop and sleep example When ten seconds has come and gone, the test in the while block is run again. I tell the sleep command to take a break for 10 seconds. After that, I give sendmail a second break by calling the Linux sleep command. A value of zero means it is finished doing all it can do, while any other number means it still has work to do, but stopped itself to give sendmail a break. Sleeping in a shell script while loopĪs an example of both a while loop and sleep command, here is how my Email Agent program is now run from inside a Bourne shell script:īasically what happens is that my Email Agent program is called by my shell script, and then the Email Agent program returns a numeric value when it is finished running. Second, I pause the program by calling the Unix/Linux sleep command from my Bourne shell script. Because the program is written in Java, I accomplish that with the Thread.sleep call in my Java code. First, I try to get it to go through messages more slowly. ![]() To help keep sendmail alive, I slow my program down in two ways. A recent problem with the Agent is that it runs too fast, apparently overwhelming the sendmail process on the machine that it runs on. As a little background, I’ve written a program I call an Email Agent that periodically scans my email inbox, and does a lot of things to the inbox, including deleting the over 6,000 spams that I receive in a typical day. While using time_sleep_until() function, if we are not specifying upcoming temporal data, rather passing old timestamp, then, this function will cause warning notice.Linux shell script FAQ: Can you share a Linux shell script while loop example? While you’re at it, can you show how to use the sleep command in the shell script while loop?.Also sending arguments with another data type except for integer value will cause PHP warning error, like, Warning: sleep() expects parameter 1 to be long.Warning: sleep(): Number of seconds must be greater than or equal to 0 If we send negative values to PHP sleep functions, then it will display notice to the browser, as follows.These points are used to be aware of any failure or warning notice, that may cause while invoking PHP sleep functions. The following list of the point should be kept in mind on writing PHP sleep programs. These differ from sleep() function with respect to the unit of time with which the parameter of these functions is passed. There are three other functions deals with the operations of pausing PHP program execution. Current Time is: 16:09:07 Related PHP Functions Pausing Execution Putting into sleep at: 16:09:02 waked up after 5 seconds. The program will display time in (Hour: Minute: Seconds) format, before and after sleep() function, and also, it will display how many seconds the program is paused using sleep(). For that, the range is specified from 5 to 10 seconds with rand().īefore invoking sleep with a randomly selected period of time, we have printed the time and repeat the same, after sleep is done. In the above program, we have used, rand() function, for randomly selecting a number of seconds, the program to be put into sleep. ![]() "" sleep($sleep_time) echo "waked up after $sleep_time seconds. Let us have a PHP example program with sleep() function pausing execution with specified amount of time. This will be done by a lot of work, like, using for getting current and manipulating them to set a limit for running loops to let the program to wait for loop execution and thereby simulating sleep(). And sometimes, people who are new to PHP may also use for holding program execution for a while, with the required amount of time in seconds. Some languages like Javascript, not having direct functions like sleep, people might obtain sleep operation by using a loop, XMLHTTP request and etc. And this integer value specifies the number of seconds to be passed while putting the program execution into sleep. This parameter should be in integer data type. PHP sleep() accepts only one and mandatory argument denoting the period of time, for what, the PHP code execution invoking this function, should be paused. This sleeping time could be controlled by a parameter, sending as an argument to this function. Like other languages, PHP sleep() is also used to pause program execution for a particular amount of time. ![]() Last modified on February 24th, 2017 by Vincy.
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