《PHP實例：PHP實現的簡單三角形、矩形周長面積計算器分享》要點：
本文介紹了PHP實例：PHP實現的簡單三角形、矩形周長面積計算器分享，希望對您有用。如果有疑問，可以聯系我們。
運用PHP面向對象的知識設計一個圖形計算器,同時也運用到了抽象類知識,這個計算器可以計算三角形的周長和面積以及矩形的周長和面積.本圖形計算器有4個頁面：1.PHP圖形計算器主頁index.php;??? 2.形狀的抽象類shape.class.php;??? 3三角形計算類triangle.class.php;??? 4.矩形計算類rect.class.php.PHP應用
PHP圖形計算器代碼點擊下載:?? php圖形計算器.zipPHP應用
代碼分別如下：PHP應用
PHP圖形計算器主頁：PHP應用
<html>
????<head>
????????<title>簡單的圖形計算器</title>
????????<meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
????</head>
?
????<body>
????????<center>
????????????<h1>簡單的圖形計算器</h1>
?
????????????<a href="index.php?action=rect">矩形</a> ||
????????????<a href="index.php?action=triangle">三角形</a>
????????</center>
?
????????<hr><br>
?
????<?php
????????????error_reporting(E_ALL & ~E_NOTICE);
?
????????????//設置自動加載這個程序需要的類文件
????????????function __autoload($classname){
????????????????include strtolower($classname).".class.php";
????????????}
?
????????????//判斷用戶是否有選擇單擊一個形狀鏈接
????????????if(!empty($_GET['action'])) {
????????????????//第一步：創建形狀的對象
????????????????$classname = ucfirst($_GET['action']);
?
????????????????$shape=new $classname($_POST);
????????????????//第二步：調用形狀的對象中的界面view()
????????????????$shape -> view();
?
????????????????//第三步：用戶是否提交了對應圖形界面的表單
????????????????if(isset($_POST['dosubmit'])) {
????????????????????//第四步：查看用戶輸出的數據是否正確, 失敗則提示
????????????????????if($shape->yan($_POST)) {
????????????????????????//計算圖形的周長和面積
????????????????????????echo $shape->name."的周長為：".$shape->zhou()."<br>";
????????????????????????echo $shape->name."的面積為：".$shape->area()."<br>";
????????????????????}
????????????????}
?
????????????//如果用戶沒有單擊鏈接, 則是默認拜訪這個主程序
????????????}else {
????????????????echo "請選擇一個要計算的圖形!<br>";
?
????????????}
?
?????????>
????</body>
</html>
形狀的抽象類：PHP應用
abstract class? Shape{
????//形狀的名稱
????public $name;
?
????//形狀的計算面積辦法
????abstract function area();
?
????//形狀的計算周長的辦法
????abstract function zhou();
?
????//形狀的圖形表單界面
????abstract function view();
????//形狀的驗證辦法
????abstract function yan($arr);
?
}
三角形計算類文件：PHP應用
class Triangle extends Shape {
????private $bian1;
????private $bian2;
????private $bian3;
?
????function __construct($arr = array()) {
????????if(!empty($arr)) {
????????????$this->bian1 = $arr['bian1'];
????????????$this->bian2 = $arr['bian2'];
????????????$this->bian3 = $arr['bian3'];
?
????????}
?
????????$this->name = "三角形";
????}
?
????function area() {
????????$p =??? ($this->bian1 + $this->bian2 + $this->bian3)/2;
?
????????return sqrt($p*($p-$this->bian1)*($p-$this->bian2)*($p-$this->bian3));
????}
?
????function zhou() {
????????return $this->bian1 + $this->bian2 + $this->bian3;
????}
?
????function view() {
????????$form = '<form action="index.php?action=triangle" method="post">';
????????$form .= $this->name.'第一個邊:<input type="text" name="bian1" value="'.$_POST['bian1'].'" /><br>';
????????$form .= $this->name.'第二個邊:<input type="text" name="bian2" value="'.$_POST['bian2'].'" /><br>';
????????$form .= $this->name.'第三個邊:<input type="text" name="bian3" value="'.$_POST['bian3'].'" /><br>';
????????$form .= '<input type="submit" name="dosubmit" value="計算"><br>';
????????$form .='<form>';
????????echo $form;
????}
?
????function yan($arr) {
????????$bj = true;
????????if($arr['bian1'] < 0) {
????????????echo "第一個邊不能小于0!<br>";
????????????$bj = false;
????????}
?
????????if($arr['bian2'] < 0) {
????????????echo "第二個邊不能小于0!<br>";
????????????$bj = false;
????????}
?
????????if($arr['bian3'] < 0) {
????????????echo "第三個邊不能小于0!<br>";
????????????$bj = false;
????????}
?
????????if(($arr['bian1']+$arr['bian2'] < $arr['bian3']) || ($arr['bian1'] + $arr['bian3'] < $arr['bian2']) || ($arr['bian2']+$arr['bian3'] < $arr['bian1'])) {
????????????echo "兩邊之和必需大于第三個邊";
????????????$bj = false;
????????}
?
????????return $bj;
????}
}
矩形計算類文件：
PHP應用
class Rect extends Shape {
????private $width;
????private $height;
?
????function __construct($arr=array()) {
?
????????if(!empty($arr)) {
????????????$this->width = $arr['width'];
????????????$this->height = $arr['height'];
????????}
????????$this->name = "矩形";
????}
?
????function area() {
????????return $this->width * $this->height;
????}
?
????function zhou() {
????????return 2*($this->width + $this->height);
????}
?
????function view() {
????????$form = '<form action="index.php?action=rect" method="post">';
????????$form .= $this->name.'的寬:<input type="text" name="width" value="'.$_POST['width'].'" /><br>';
????????$form .= $this->name.'的高:<input type="text" name="height" value="'.$_POST['height'].'" /><br>';
????????$form .= '<input type="submit" name="dosubmit" value="計算"><br>';
????????$form .='<form>';
????????echo $form;
????}
?
????function yan($arr) {
????????$bg = true;
????????if($arr['width'] < 0) {
????????????echo $this->name."的寬不克不及小于0!<br>";
????????????$bg = false;???
????????}
?
????????if($arr['height'] < 0) {
????????????echo $this->name."的高度不克不及小于0!<br>";
????????????$bg = false;
????????}
?
????????return $bg;
????}
?
}
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