11-25-2016
One more point, in addition to what has been said:
You need to define, what you mean by "latest". The one having the most recent modification time, or the one having a "most recent" timestamp embedded in the file name?
I found that in practical applications, the latter is used more often, because it is too easy changing the modification time of an old file to a new value by accidentally touching it. Writing a backup script of course depends on how you define the "latest" file.
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LEARN ABOUT PHP
time_sleep_until
TIME_SLEEP_UNTIL(3) 1 TIME_SLEEP_UNTIL(3)
time_sleep_until - Make the script sleep until the specified time
SYNOPSIS
bool time_sleep_until (float $timestamp)
DESCRIPTION
Makes the script sleep until the specified $timestamp.
PARAMETERS
o $timestamp
- The timestamp when the script should wake.
RETURN VALUES
Returns TRUE on success or FALSE on failure.
CHANGELOG
+--------+---------------------------------------------------+
|Version | |
| | |
| | Description |
| | |
+--------+---------------------------------------------------+
| 5.3.0 | |
| | |
| | This function is now available on Windows plat- |
| | forms. |
| | |
+--------+---------------------------------------------------+
ERRORS
/EXCEPTIONS
If the specified $timestamp is in the past, this function will generate a E_WARNING.
EXAMPLES
Example #1
A time_sleep_until(3) 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));
?>
NOTES
Note
All signals will be delivered after the script wakes up.
SEE ALSO
sleep(3), usleep(3), time_nanosleep(3), set_time_limit(3).
PHP Documentation Group TIME_SLEEP_UNTIL(3)