{
return $width * $height;
}
public function getPerimeter($width, $height)
{
return $width + $height;
}
public function isSquare()
{
return $this->width == $this->height;
}
}
$width = 160;
$height = 75;
echo "<h2>With a width of {$width} and a height of {$height}...</h2>";
$r = new Rectangle($width, $height);
echo '<p>The area of the rectangle is ' . $r->getArea($width, $height) . '</p>';
echo '<p>The perimeter of the rectangle is ' . $r->getPerimeter($width, $height) . '</p>';
echo '<p>This rectangle is ';
if ($r->isSquare()) {
echo 'also';
} else {
echo 'not';
}
echo ' a square.</p>';
?>
</p>
</body>
</html>
}
public function getPerimeter()
{
return $this->width * 2 + $this->height * 2;
}
public function isSquare()
{
if ($this->width == $this->height) {
return true;
}
}
}
$width = 160;
$height = 75;
echo "<h2>With a width of {$width} and a height of {$height}...</h2>";
$r = new Rectangle($width, $height);
echo '<p>The area of the rectangle is ' . $r->getArea() . '</p>';
echo '<p>The perimeter of the rectangle is ' . $r->getPerimeter() . '</p>';
echo '<p>This rectangle is ';
if ($r->isSquare()) {
echo 'also';
} else {
echo 'not';
}
echo ' a square.</p>';
?>
</p>
</body>
</html>
<?php // PHP exercise about extending classes from a parent class. Rectangle is the parent class. // Square is the child class extending off of Rectangle. // This file runs in the command line. // Because Square.php requires Rectangle.php, this file has access to both. require_once 'Square.php'; $rectangle = new Rectangle(5, 10); echo 'Rectangle area: ' . $rectangle->getArea() . PHP_EOL; echo 'Rectangle perimeter: ' . $rectangle->getPerimeter() . PHP_EOL; $square = new Square(9); echo 'Square area: ' . $square->getArea() . PHP_EOL; echo 'Square perimeter: ' . $square->getPerimeter() . PHP_EOL;
宽度：<input type="text" name="width" > <br/>
高度：<input type="text" name="height" > <br/>
<input type="submit" name="btn" value="计算">
</form>
</body>
</html>
<?php
include 'file_7_extraTraining.php';
class Rectangle extends Shape
{
private $width, $height;
function __construct($width, $height)
{
$this->width = $width;
$this->height = $height;
}
function getArea()
{
return $this->width * $this->height;
}
function getPerimeter()
{
return 2 * $this->width + 2 * $this->height;
}
}
if (isset($_POST["btn"])) {
$rect1 = new Rectangle($_POST["width"], $_POST["height"]);
echo "矩形的周长：" . $rect1->getPerimeter() . "<br/>";
echo "矩形的面积：" . $rect1->getArea() . "<br/>";
}
