php - Cache problem on changing src attr with same file name -

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I am trying to change the src path of an IMG tag closer to

with me : 

  & lt; Img src = "img1.jpg" & gt; Then I upload a new picture through the IFrame and take the new picture the same name (img1.jpg), then by AJAX I refresh the SRAR path (which is the same but the photo has changed)  < / Pre> 
 P> 
 The problem is that I use the same file name, the IMG does not change in the browser browser, the browser is estimating the cache ...  
 Is there a jquery, html or php solution in it?  
 Thanks   
 
 
 You can try to add a random query string at the end ... Img src = "img1.jpg? Random_string"

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