PHP | sleep( ) Function

The sleep() function in PHP is an inbuilt function which is used to delay the execution of the current script for a specified number of seconds. The sleep( ) function accepts seconds as a parameter and returns TRUE on success or FALSE on failure.

If the call is interrupted by a signal, sleep() function returns a non-zero value. On Windows, this value will always be 192 whereas, on other platforms, the return value will be the number of seconds left to sleep.

Syntax:

sleep($seconds)

Parameters Used: The sleep() function in PHP accepts one parameter.

• $seconds : It is a mandatory parameter which specifies the number of seconds.

Return Value: It returns TRUE on success or FALSE on failure.

Errors And Exceptions:

1. If the call is interrupted by a signal, sleep() function returns a non-zero value.
2. The value of seconds passed as parameter should be non-negative else this function will generate a E_WARNING..

Below programs illustrate the sleep() function:

Program 1:

<?php
// displaying time
echo date('h:i:s')."\n" ;

// delaying execution of the script for 2 seconds
sleep(2);

// displaying time again
echo date('h:i:s');
?>

Output:

06:53:48
06:53:50

Program 2:

<?php
// displaying time
echo date('h:i:s')."\n" ;

// using rand() function to randomly choose
// a value and delay execution of the script
sleep(rand(1, 5));

// displaying time again
echo date('h:i:s');

?>

Output:

06:53:48
06:53:52

Reference: http://php.net/manual/en/function.sleep.php

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