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PHP関数の定義

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<?php

//この下に関数getRectangleAreaを作ってください
//引数として$heightと$widthを受け取り、
//その面積をreturnします
//この下で$rectangle_areaに高さが5、幅が10の長方形の面積を、
//getRectangleArea関数を用いて代入してください



function getRectangleArea($height, $width){
  return $height * $width;
}
$rectangle_area = getRectangleArea(5,10);

//$height = 5 , $width = 10が代入される
//returnで5×10の計算
//最後に$rectangle_areaに計算結果を代入





//この下に関数printAreaを作ってください
//引数として$areaを受け取り、
//"面積は".$area."です。"とechoします
//この下で$rectangle_areaの面積を、
//printArea関数を用いてechoしてください。


function printArea($area){
  echo "面積は".$area."です。";
}
printArea($rectangle_area);

//printAreaに先ほど計算した$rectangle_areaの結果を代入して、echoで表示

?>

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