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$colors=array(
  array("red","rgb(255,0,0)"),
  array("yellow","rgb(255,255,0)"),
  array("green","rgb(0,255,0)"),
  array("blue","rgb(0,0,255)")
  );
echo $colors[0][0];
echo " - ";
echo $colors[0][1];
echo "<br/>";


This really makes clear to us that what we are creating is in fact an array of arrays.
The output is: red - rgb(255,0,0)