php - Generate an incremental $variable when in a for loop -

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this question has answer here:

i'd increment variable within loop "$filename" turns "$filename1" , $filename2"? 

$filename = false; $filename1 = false; $filename2 = false;      ($i = null; $i <=2; $i++){   $filename = $this->blabla; }

use variable variables:

${"filename".$i} = $this->blabla;

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