(PHP 5 >= 5.1.0, PHP 7)
time_sleep_until — Make the script sleep until the specified time
time_sleep_until ( float $timestamp ) : bool
Makes the script sleep until the specified timestamp.
timestamp
The timestamp when the script should wake.
Returns true on success or false on failure.
If the specified timestamp is in the past, this function will generate a E_WARNING.
Example #1 A time_sleep_until() example
<?php //returns false and generates a warning var_dump(time_sleep_until(time()-1)); // may only work on faster computers, will sleep up to 0.2 seconds var_dump(time_sleep_until(microtime(true)+0.2)); ?>
Note: All signals will be delivered after the script wakes up.
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https://www.php.net/manual/en/function.time-sleep-until.php