how to give unique name to file in php in loop

Question

I m just renaming file in directory....

...bt my files got duplicate...

due to duplicate .... some file get deleted...

I have an issue in my script...

bt im unable to solve this..

my script---

for($i=2;$i<=count($worksheet);$i++)
    {               
        $directory = $_SERVER['DOCUMENT_ROOT'].'/mesleep/uploaded_files/test/';             

        $sku = (!isset($worksheet[$i][1])) ? '' : addslashes(trim($worksheet[$i][1]));
        $image_1 = (!isset($worksheet[$i][2])) ? '' : htmlentities(trim($worksheet[$i][2]));
        rename($directory.$image_1,$directory.$sku.'_'.$i);

        $image_2 = (!isset($worksheet[$i][3])) ? '' : htmlentities(trim($worksheet[$i][3]));

        rename($directory.$image_2,$directory.$sku.'_'.$i);
    } 

how can i make my image name unique...

Answer 1

试试这个http://php.net/manual/en/function.uniqid.php这将有助于提供唯一的字符串。

$uniqueString = uniqid(random(),true);

Answer 2

There are many ways to do so :

You can add time() before name.

Example:

    $imageName="XYZ.png";

    $uniqueImageName=time().$imageName; //Add time stamp before name to give image a unique name

In case assign name in loop, concatenate extra value with increament.

Like :

    for($i=1;$i<=$lengthOfLoop;$i++)
    {
        $imageName="XYZ.png";

        $uniqueImageName=time().$i.$imageName;  //Add time stamp before name to give image a unique name
    }