php variables as keys in arrays

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1<?php
2$age=array("Peter"=>"35","Ben"=>"37","Joe"=>"43");
3foreach($age as $x=>$x_value)
4  {
5  echo "Key=" . $x . ", Value=" . $x_value;
6  echo "<br>";
7  }
8?>

1$id = 1;
2$age = 2;    
3$sort = "id"; // or "age";
4    $Key = $$sort;
5$arr = array($Key => 'string');
6
7print_r($arr);

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