PHP Exercises : Delay the program execution for the specified number of seconds

Last update on May 30 2022 11:45:44 (UTC/GMT +8 hours)

PHP : Exercise-18 with Solution

Write a PHP script to delay the program execution for the given number of seconds.

Sample Solution: -

PHP Code:

<?php
// current time
  echo date('h:i:s') . "\n";
  // sleep for 5 seconds
  sleep(5);
  // wake up
  echo date('h:i:s')."\n";
?>

Sample Output:

02:47:42                                                            
02:47:47

int sleep ( int $seconds ): sleep() function is used to delay the program execution for the given number of seconds.

Flowchart:

PHP Code Editor:

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Next: Arithmetic operations on character variables : $d = 'A00'. Using this variable print the following numbers.

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PHP: Tips of the Day

How to Sort Multi-dimensional Array by Value?

Try a usort, If you are still on PHP 5.2 or earlier, you'll have to define a sorting function first:

Example:

function sortByOrder($a, $b) {
    return $a['order'] - $b['order'];
}

usort($myArray, 'sortByOrder');

Starting in PHP 5.3, you can use an anonymous function:

usort($myArray, function($a, $b) {
    return $a['order'] - $b['order'];
});

And finally with PHP 7 you can use the spaceship operator:

usort($myArray, function($a, $b) {
    return $a['order'] <=> $b['order'];
});

To extend this to multi-dimensional sorting, reference the second/third sorting elements if the first is zero - best explained below. You can also use this for sorting on sub-elements.

usort($myArray, function($a, $b) {
    $retval = $a['order'] <=> $b['order'];
    if ($retval == 0) {
        $retval = $a['suborder'] <=> $b['suborder'];
        if ($retval == 0) {
            $retval = $a['details']['subsuborder'] <=> $b['details']['subsuborder'];
        }
    }
    return $retval;
});

If you need to retain key associations, use uasort() - see comparison of array sorting functions in the manual

Ref : https://bit.ly/3i77vCC