Swap Two Numbers In PHP

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<?php
  $no1 = 90;
  $no2 = 100;
  //define another variable then change values.
  $temp = $no1;
  echo "Before swap :<br/>no1=$no1, no2=$no2";
  $no1 = $no2;
  $no2 = $temp;
  echo "<br/> After swap :<br/>no1=$no1, no2=$no2";
?>

Before swap :
no1=90, no2=100
After swap :
no1=100, no2=90

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