What are the meanings of $ form in the code and how to solve it?

$ Form in the code indicates what the $ form in the code below will declare this and assign the value again later. it's a mess. I don't know how to fulfill this logic? Function & nbsp ;__ toString () {$ form = '& lt; form & nbsp; action = "'. $ th what each $ form represents in the code
In the following code, $ form declares that the assignment will be assigned again later, which is a mess. I don't know how to fulfill this logic?

function __toString(){
$form='';
return $form;
}

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