How to execute a function in php after a few seconds

Implementation method: 1. Use the "sleep (delay seconds)" statement to delay the execution of the function for several seconds; 2. Use the "time_nanosleep (delay seconds, delay nanoseconds)" statement to delay the execution Function several seconds and nanoseconds; 3. Use the "time_sleep_until(time() 7)" statement.

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

There are 3 functions in php that can achieve delayed execution Function:

• sleep() function

• time_nanosleep() function

• time_sleep_until() function
  

1. Use the sleep() function to delay the execution of a function

The sleep function indicates delayed execution and can delay the execution of the current script. several seconds. The syntax is:

sleep($seconds)

This function only accepts one required parameter $seconds, which is used to specify how many seconds the script needs to be delayed. Returns 0 on success, FALSE on error; if the call was interrupted by a signal, the function returns a nonzero value.

Let’s take a look at a specific example:

<?php
// 当前时间
echo date("Y-m-d H:i:s")."<br>";
function f($a, $b=33, $c=57){
	// 延迟5秒钟
	sleep(5);
    echo date("Y-m-d H:i:s");
}
f(11);
?>

Output result:

2, Use the time_nanosleep() function to delay the execution of a function. The

time_nanosleep() function delays the execution of the current script for a number of seconds and nanoseconds. The syntax is:

time_nanosleep($seconds,$nanoseconds)

This function accepts 2 required parameters $seconds (delay seconds) and $nanoseconds (delay nanoseconds). Returns 0 on success, FALSE on error; if the call is interrupted by a signal, an associative array with the number of seconds remaining in the delay and the number of nanoseconds remaining in the delay is returned.

Let’s learn about it through specific examples:

<?php
// 当前时间
echo date("Y-m-d H:i:s")."<br>";
function f($a, $b=33, $c=57){
	// 延迟5.5秒钟
	time_nanosleep(5,500000000);
    echo date("Y-m-d H:i:s");
}
f(11);
?>

Output results:

3. Use time_sleep_until( )Function to delay the execution of the script program

time_sleep_until() function delays the execution of the current script until the specified time. The syntax is:

time_sleep_until($timestamp)

This function only accepts one required parameter $timestamp, which is used to specify the wake-up time. Returns 0 on success or FALSE on error.

Let’s learn about it through specific examples:

<?php
// 当前时间
echo date("Y-m-d H:i:s")."<br>";
function f($a, $b=33, $c=57){
	// 延迟7秒钟
	time_sleep_until(time()+7);
    echo date("Y-m-d H:i:s");
}
f(11);
?>

Output results:

Recommended learning: "PHP Video Tutorial》

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