How does php implement a function after a few seconds

This article introduces the knowledge of "how to implement a function in a few seconds". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Implementation method: 1, using the "sleep (delay seconds)" statement, you can delay the execution of the function for several seconds; 2, using the "time_nanosleep (delay seconds, delay nanosecond)" statement, you can delay the execution of the function for several seconds and nanoseconds; 3, using the "time_sleep_until (time () + 7)" statement.

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

There are three functions in php that implement deferred execution:

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 a delay in execution, which can delay the execution of the current script for several seconds. The syntax is:

Sleep ($seconds)

This function takes only one required argument, $seconds, which specifies how many seconds the script needs to delay. Returns 0 on success and FALSE; on error. If the call is interrupted by the signal, the function returns a non-zero value.

Let's take a look at this through a specific example:

Output result:

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

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

Time_nanosleep ($seconds,$nanoseconds)

This function takes two required arguments, $seconds (delay seconds) and $nanoseconds (delay nanoseconds). Returns 0 on success and FALSE; on error. If the call is interrupted by the signal, it returns an associative array with the number of seconds left in the delay and the number of nanoseconds remaining in the delay.

Let's take a look at this through a specific example:

Output result:

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

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

Time_sleep_until ($timestamp)

This function takes only one required argument, $timestamp, to specify the wake-up time. Returns 0 on success and FALSE on error.

Let's take a look at this through a specific example:

Output result:

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