Check if image has been updated

andrewmg

Ok, basic idea of the script:
I have a webcam that uploads an image to a server. The camera only uploads if motion is detected.

I attempted to write a script to tell me when the image was last updated. BUT, I want it to compare to another time that I have documented in "time.txt"
BUT, the script says that the time is not the same regardless...

Anyways, without further a due, heres the script.

<?php
$your_data = date("m/d/y H:i:s", filemtime("image.jpg"));
$myFile = "time.txt";
$fh = fopen($myFile, 'r');
$theData = fread($fh, filesize($myFile));
fclose($myfile);

if ($your_data == $theData) {
        print "<img src='image.jpg'><br>File has not been updated <br>$your_data<br>$theData";
} else {
        print "THE IMAGE IS CURRENTLY UP-TO-DATE<br>This means that the broadcasted image is up-to-date with the indexed image based on a script that stores the image's last modified time in a txt file.<br> It is compared with the current modified time of the actual image.<br><br> and this is your_data: <b>$your_data</b><br>and this is theData: <b>$theData</b>";
}

?>

However, regardless if $your_data equals $theData, it always outputs the else statement.

Here's the output of the page, as you can see the variables are the same:

THE IMAGE IS CURRENTLY UP-TO-DATE
This means that the broadcasted image is up-to-date with the indexed image based on a script that stores the image's last modified time in a txt file.
It is compared with the current modified time of the actual image.

and this is your_data: 12/09/08 08:44:45
and this is theData: 12/09/08 08:44:45

Any Ideas?

andrewmg

I figured it out, you have to write the file... that's how it matches... I was inputting the output of the $your_data into a the txt file, I did a fwrite to write the $your_data to the file, and it works flawlessly, dunno if anyone is doing anything similar heres the script.

<?php
$your_data = date("m/d/y h:i A", filemtime("image.jpg"));
$myFile = "time.txt";
$fh = fopen($myFile, 'r');
$theData = fread($fh, filesize($myFile));
fclose($myfile);

if ($your_data == $theData) {
        print "File has not been updated since: <b>$theData</b>";
} else {
        print "THE IMAGE HAS RECENTLY BEEN UPDATED<br>This means that the broadcasted image is up-to-date with the indexed image based on a script that stores the image's last modified time in a txt file.<br> It is compared with the current modified time of the actual image.<br><br> New Date: <b>$your_data</b><br>Old Date: <b>$theData</b>";
        $fp = fopen('time.txt', 'w');
        fwrite($fp, $your_data);
        fclose($fp);

}

?>

NogDog

One thought would be to [man]trim/man the value retrieved from the file before comparing it, in case there is any extraneous newlines or other white-space.

Also, just a little tweak to simplify the code, you could use [man]file_get_contents/man to read the file instead of all the fopen() etc. stuff.

andrewmg

Ok, I'm at my next stage of things, once it's starts updating how would I get it to start making copies of image.jpg into an archive but have it same them as image%currenttimestamp.jpg ?

just off the top of my head:

$file = 'image.jpg';
$newfile = date("m/d/y h:i:s A", filemtime("image.jpg"))image.jpg);

copy($file, $newfile);

NogDog

I'd be careful about what characters you use in the file name. It might be better to use something like:

$newfile = date("Ymd_His", filemtime("image.jpg")).".jpg";

This way files will be named in an easily sortable way like "20081209_123354.jpg", which in addition to being a "safe" file name on any (modern) OS is also easy to sort (since it uses a sortable date_time format), yet is not all that hard for a human to read and interpret.

andrewmg

ah thank you, you're too kind.