PHP, Date-Time and Calendar functions


<?php



int sleep ( int $seconds )





where,



$seconds = Number of seconds to delay the program execution

  

?>

$seconds

Number of seconds to delay the program execution.

This function returns a non-zero value if the call was interrupted by a signal.

On Windows™, this value is always 192, the WAIT_IO_COMPLETION constant within the Windows™ API.

On others environments the returned value will be the number of seconds to sleep.

This function will generate a Warning: ... in PHP 7.4.XX or Fatal error: ... in PHP 8.0.XX, if the provided number of seconds is negative.

EXERCISE


<?php



$lang = 'jp';



$str_tzg = date_default_timezone_get();



$pt = 'Fuso horário atual:<br>';

$en = 'Current Time Zone:<br>';

$jp = 'タイムゾーンセット：<br>';



echo '<br>' . $$lang  . '&nbsp;' . $str_tzg . '<br><br>';



echo date("l F d Y H:i:s");

echo '<br><br>';



$time2sleep = 15;

sleep($time2sleep);



// Delays the execution time by 15 seconds



echo date("l F d Y H:i:s");



?>

EXERCISE


<?php



$lang = 'en';



$str_tzg = date_default_timezone_get();



$pt = 'Fuso horário atual:<br>';

$en = 'Current Time Zone:<br>';

$jp = 'タイムゾーンセット：<br>';



echo '<br>' . $$lang  . '&nbsp;' . $str_tzg . '<br><br>';



echo date("l F d Y H:i:s");

echo '<br><br>';



$time2sleep = -5; 



// Number of seconds less than zero

// This generates Warning in PHP 7.4.XX 

// and Fatal error in PHP 8.0.XX 



sleep($time2sleep);



echo date("l F d Y H:i:s");



?>