The time_nanosleep() function in PHP is an inbuilt function which is used to delay the execution of the current script for a specified number of seconds and nanoseconds.
The time_nanosleep() function accepts seconds and nanoseconds as parameters and returns TRUE on success or FALSE on failure.
If the delay is interrupted by a signal, an associative array is returned with the following components:
- seconds: It denotes the number of seconds remaining in the delay.
- nanoseconds: It denotes the number of nanoseconds remaining in the delay.
Syntax:
time_nanosleep(seconds, nanoseconds)
Parameters Used:
The time_nanosleep() function in PHP accepts two parameters.
- seconds : It is a mandatory parameter which specifies the number of seconds.
- nanoseconds : It is a mandatory parameter which specifies the number of nanoseconds.
Return Value: It returns TRUE on success or FALSE on failure.If the delay is interrupted by a signal, an associative array is returned with the remaining seconds and nanoseconds.
Errors And Exceptions:
- The value of nanoseconds passed as parameter must be less than 1, 000, 000, 000.
- The value of seconds passed as parameter should be non-negative.
Below programs illustrate the time_nanosleep() function:
Program 1:
<?php // displaying time if (time_nanosleep(2, 500000000) === true) {    echo "Execution delayed for two and half a second"; } else {    echo "No delay in Execution"; } ?> |
Output:
Execution delayed for two and half a second
Program 2:
<?php // displaying time echo date('h:i:s'); Â Â // delaying execution of the script for 2 seconds and half a second time_nanosleep(2, 500000000); Â Â // displaying time again echo ("\n"); echo date('h:i:s');Â ?> |
Output:
06:45:15 06:45:18
Reference : http://php.net/manual/en/function.time-nanosleep.php
