Modifier la valeur d’une variable globale

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<?php
   $somme=0;
   function clacul($a,$b)
   {
     $GLOBALS["somme"]=$a+$b;
   }
   print "Valeur initiale de la variable globale :".$GLOBALS["somme"];
   clacul(5,6);
   print "<br/>Valeur après la somme de (5+6)= ".$GLOBALS["somme"];
?>

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