Images Not Updating Instantly

Images Not Updating Instantly, Students Make Registration To Fill Application Form
If Image Is Not Updating Instantly Then What 's The USE Of This Platform
Even After Switching Development Mode Students Need CTRL+F5 To Reload
We Are Not Expecting This Kind Of Service

Attaching one random string to query should fix it

<img src="picture.jpg?1222259157.415" alt="">

Where 1222259157.415 is current time can be generated by various techniques.

Thank You Solution I Added & It Worked 100%
// Generating a random number `

$randomNumber = rand(); `

<img src="<?php echo $sign; ?>?<?php echo $randomNumber; ?>"

no problem mark it as answer so others can find easily.