How to fill Html input from a URL parameter?

Good day to all! Have a feedback form, the switch occurs at the transition links in the QR code, in addition to the references contains the value that is attached to the link as parameter, it turns out the link:
And you need to log this value = *********, how to do it tell me?
June 10th 19 at 14:56
1 answer
June 10th 19 at 14:58
echo $_GET['str'];
Sure! Something I am extremely "lost"))))) - Leda15 commented on June 10th 19 at 15:01
Write value="$_GET['str']" , flies into a text field $_GET['str'] instead of the value str - Cordia_Bedn commented on June 10th 19 at 15:04

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