php Unique filename when uploading

Question

I've a submit discussion form with image upload in my website. Now, I want to upload a unique file name when the user submits their image so that I can show the result of all images and can avoid duplicate file names. How can I do this with php? If you need my form process code then I'll upload it. JavaScript questions and answers, JavaScript questions pdf, JavaScript question bank, JavaScript questions and answers pdf, mcq on JavaScript pdf, JavaScript questions and solutions, JavaScript mcq Test , Interview JavaScript questions, JavaScript Questions for Interview, JavaScript MCQ (Multiple Choice Questions)

Answer 1

You can use the uniqid() function to generate a unique ID /** * Generate a unique ID * @link http://www.php.net/manual/en/function.uniqid.php * @param prefix string[optional]

* Can be useful, for instance, if you generate identifiers * simultaneously on several hosts that might happen to generate the * identifier at the same microsecond. *

*

* With an empty prefix, the returned string will * be 13 characters long. If more_entropy is * true, it will be 23 characters. *

* @param more_entropy bool[optional]

* If set to true, uniqid will add additional * entropy (using the combined linear congruential generator) at the end * of the return value, which should make the results more unique. *

* @return string the unique identifier, as a string. */ function uniqid ($prefix = null, $more_entropy = null) {}