1. \n
        class<\/span>=\"box\">\n    
        圖形計(jì)算器<\/h1>\n    
        \n        矩形<\/a>\n        三角形<\/a>\n    <\/div>\n<\/div>    \n    php\n        <\/span>error_reporting<\/span>(E_ALL<\/span> & ~E_NOTICE<\/span>);\n        <\/span>function<\/span> __autoload($classname<\/span>){\n            <\/span>include<\/span> strtolower<\/span>($classname<\/span>).\".class.php\";\n        }\n        <\/span>if<\/span>(!empty<\/span>($_GET<\/span>['action'])) {\n            <\/span>$classname<\/span> = ucfirst<\/span>($_GET<\/span>['action']);\n            <\/span>$shape<\/span>=new<\/span> $classname<\/span>($_POST<\/span>);\n            <\/span>$shape<\/span>->view();\n            <\/span>if<\/span>(isset<\/span>($_POST<\/span>['dosubmit'])) {\n                <\/span>if<\/span>($shape<\/span>->test($_POST<\/span>)) {\n                    <\/span>echo<\/span> $shape<\/span>->name.\"的面積為：\".$shape<\/span>->area().\"
        \";\n                }\n            }\n        }<\/span>else<\/span>{\n            <\/span>echo<\/span> \"請選擇一個(gè)要計(jì)算的圖形!
        \";\n        }\n    <\/span>?>\n<\/body>\n<\/html><\/pre>\n<\/div>\n
         <\/p>\n
        Rectangular class<\/h3>\n
        \n
        \/\/<\/span>rect.class.php<\/span>\nphp\n<\/span>class<\/span> Rect extends<\/span> Shape{\n    <\/span>private<\/span> $width<\/span>;\n    <\/span>private<\/span> $height<\/span>;\n    <\/span>function<\/span> __construct($arr<\/span>=[]){\n        <\/span>if<\/span>(!empty<\/span>($arr<\/span>)){\n            <\/span>$this<\/span>->width = $arr<\/span>['width'];\n            <\/span>$this<\/span>->height = $arr<\/span>['height'];\n        }\n        <\/span>$this<\/span>->name = \"矩形\";\n    }\n    <\/span>function<\/span> area() {\n        <\/span>return<\/span> $this<\/span>->width * $this<\/span>->height;\n    }\n    <\/span>function<\/span> view() {\n        <\/span>$form<\/span> = '
        ';\n        <\/span>$form<\/span> .=$this<\/span>->name.'的寬:
        ';\n        <\/span>$form<\/span> .=$this<\/span>->name.'的高:
        ';\n        <\/span>$form<\/span> .='
        ';\n        <\/span>$form<\/span> .='<\/form>';\n        <\/span>echo<\/span> $form<\/span>;\n    }\n    <\/span>function<\/span> test($arr<\/span>) {\n        <\/span>$bg<\/span> = true<\/span>;\n        <\/span>if<\/span>($arr<\/span>['width'] < 0) {\n            <\/span>echo<\/span> $this<\/span>->name.\"的寬不能小于0!
        \";\n            <\/span>$bg<\/span> = false<\/span>;    \n        }\n        <\/span>if<\/span>($arr<\/span>['height'] < 0) {\n            <\/span>echo<\/span> $this<\/span>->name.\"的高度不能小于0!
        \";\n            <\/span>$bg<\/span> = false<\/span>;\n        }\n        <\/span>return<\/span> $bg<\/span>;\n    }\n}\n<\/span>?><\/pre>\n<\/div>\n
         <\/p>\n
        Triangle class<\/h3>\n
        \n
        \/\/<\/span>triangle.class.php<\/span>\nphp\n<\/span>class<\/span> Triangle extends<\/span> Shape{\n    <\/span>private<\/span> $b1<\/span>;\n    <\/span>private<\/span> $b2<\/span>;\n    <\/span>private<\/span> $b3<\/span>;\n    <\/span>function<\/span> __construct($arr<\/span>=[]){\n        <\/span>if<\/span>(!empty<\/span>($arr<\/span>)){\n            <\/span>$this<\/span>->b1 = $arr<\/span>['b1'];\n            <\/span>$this<\/span>->b2 = $arr<\/span>['b2'];\n            <\/span>$this<\/span>->b3 = $arr<\/span>['b3'];\n        }\n        <\/span>$this<\/span>->name = \"三角形\";\n    }\n    <\/span>function<\/span> area() {\n        <\/span>$p<\/span> = ($this<\/span>->b1 + $this<\/span>->b2 + $this<\/span>->b3)\/2;\n        <\/span>return<\/span> sqrt<\/span>($p<\/span>*($p<\/span>-$this<\/span>->b1)*($p<\/span>-$this<\/span>->b2)*($p<\/span>-$this<\/span>->b3));\n    }\n    <\/span>function<\/span> view() {\n        <\/span>$form<\/span> = '';\n        <\/span>$form<\/span> .=$this<\/span>->name.'第一個(gè)邊的寬:
        ';\n        <\/span>$form<\/span> .=$this<\/span>->name.'第二個(gè)邊的寬:
        ';\n        <\/span>$form<\/span> .=$this<\/span>->name.'第三個(gè)邊的寬:
        ';\n        <\/span>$form<\/span> .='
        ';\n        <\/span>$form<\/span> .='<\/form>';\n        <\/span>echo<\/span> $form<\/span>;\n    }\n    <\/span>function<\/span> test($arr<\/span>) {\n        <\/span>$bg<\/span> = true<\/span>;\n        <\/span>if<\/span>($arr<\/span>['b1'] < 0) {\n            <\/span>echo<\/span> \"第一個(gè)邊的寬不能小于0!
        \";\n            <\/span>$bg<\/span> = false<\/span>;    \n        }\n        <\/span>if<\/span>($arr<\/span>['b2'] < 0) {\n            <\/span>echo<\/span> \"第二個(gè)邊的寬不能小于0!
        \";\n            <\/span>$bg<\/span> = false<\/span>;    \n        }\n        <\/span>if<\/span>($arr<\/span>['b3'] < 0) {\n            <\/span>echo<\/span> \"第三個(gè)邊的寬不能小于0!
        \";\n            <\/span>$bg<\/span> = false<\/span>;    \n        }\n        <\/span>if<\/span>(($arr<\/span>['b1'] + $arr<\/span>['b2'] < $arr<\/span>['b3'])||($arr<\/span>['b1'] + $arr<\/span>['b3'] < $arr<\/span>['b2'])||($arr<\/span>['b3'] + $arr<\/span>['b2'] < $arr<\/span>['b1'])){\n            <\/span>echo<\/span> '兩邊之和不能小于第三邊
        ';\n            <\/span>$bg<\/span> = false<\/span>;\n        }\n        <\/span>return<\/span> $bg<\/span>;\n    }\n}\n<\/span>?><\/pre>\n<\/div>\n
        <\/div>\n
        <\/div>"}	
	







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        Table of Contents
        
						
        
							
															
        
									Previous words
								
        
																
        
									Graphics
								
        
																
        
									Main interface
								
        
																
        
									Rectangular class
								
        
																
        
									Triangle class
								
        
														
        
					
        
				
        
							
        
					
        
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						The sixth part of the object-oriented series of front-end learning PHP: Implementation of a simple graphic area calculator
					
        
					
					
        
						
        
							
        The sixth part of the object-oriented series of front-end learning PHP: Implementation of a simple graphic area calculator
        
							
							Nov 16, 2016 am	 10:24 AM
														
						
        
					
        
					
        
					
        
						
        
						
						
						

					
        Previous words
        

        This article uses object-oriented technology to implement a simple graphic area calculator
        

         
        

        Graphics
        

        

        <span style="color: #008000;">//</span><span style="color: #008000;">rect.class.php</span>
<?<span style="color: #000000;">php
    </span><span style="color: #0000ff;">abstract</span> <span style="color: #0000ff;">class</span><span style="color: #000000;"> Shape{
        </span><span style="color: #0000ff;">public</span> <span style="color: #800080;">$name</span><span style="color: #000000;">;
        </span><span style="color: #0000ff;">abstract</span> <span style="color: #0000ff;">function</span><span style="color: #000000;"> area();
        </span><span style="color: #0000ff;">abstract</span> <span style="color: #0000ff;">function</span><span style="color: #000000;"> view();
        </span><span style="color: #0000ff;">abstract</span> <span style="color: #0000ff;">function</span> test(<span style="color: #800080;">$arr</span><span style="color: #000000;">);
    }
</span>?>
        

        

         
        

        Main interface
        

        

        <span style="color: #008000;">//</span><span style="color: #008000;">index.php</span>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style>
.<span style="color: #000000;">box{
    width</span>:<span style="color: #000000;"> 800px;
    margin</span>: 0<span style="color: #000000;"> auto;
}
</span></style>
</head>
<body>
<div <span style="color: #0000ff;">class</span>="box">
    <h1>圖形計(jì)算器</h1>
    <div>
        <a href="index.php?action=rect">矩形</a>
        <a href="index.php?action=triangle">三角形</a>
    </div>
</div>    
    <?<span style="color: #000000;">php
        </span><span style="color: #008080;">error_reporting</span>(<span style="color: #ff00ff;">E_ALL</span> & ~<span style="color: #ff00ff;">E_NOTICE</span><span style="color: #000000;">);
        </span><span style="color: #0000ff;">function</span> __autoload(<span style="color: #800080;">$classname</span><span style="color: #000000;">){
            </span><span style="color: #0000ff;">include</span> <span style="color: #008080;">strtolower</span>(<span style="color: #800080;">$classname</span>).".class.php"<span style="color: #000000;">;
        }
        </span><span style="color: #0000ff;">if</span>(!<span style="color: #0000ff;">empty</span>(<span style="color: #800080;">$_GET</span>['action'<span style="color: #000000;">])) {
            </span><span style="color: #800080;">$classname</span> = <span style="color: #008080;">ucfirst</span>(<span style="color: #800080;">$_GET</span>['action'<span style="color: #000000;">]);
            </span><span style="color: #800080;">$shape</span>=<span style="color: #0000ff;">new</span> <span style="color: #800080;">$classname</span>(<span style="color: #800080;">$_POST</span><span style="color: #000000;">);
            </span><span style="color: #800080;">$shape</span>-><span style="color: #000000;">view();
            </span><span style="color: #0000ff;">if</span>(<span style="color: #0000ff;">isset</span>(<span style="color: #800080;">$_POST</span>['dosubmit'<span style="color: #000000;">])) {
                </span><span style="color: #0000ff;">if</span>(<span style="color: #800080;">$shape</span>->test(<span style="color: #800080;">$_POST</span><span style="color: #000000;">)) {
                    </span><span style="color: #0000ff;">echo</span> <span style="color: #800080;">$shape</span>->name."的面積為：".<span style="color: #800080;">$shape</span>->area()."<br>"<span style="color: #000000;">;
                }
            }
        }</span><span style="color: #0000ff;">else</span><span style="color: #000000;">{
            </span><span style="color: #0000ff;">echo</span> "請選擇一個(gè)要計(jì)算的圖形!<br>"<span style="color: #000000;">;
        }
    </span>?>
</body>
</html>
        

        

         
        

        Rectangular class
        

        

        <span style="color: #008000;">//</span><span style="color: #008000;">rect.class.php</span>
<?<span style="color: #000000;">php
</span><span style="color: #0000ff;">class</span> Rect <span style="color: #0000ff;">extends</span><span style="color: #000000;"> Shape{
    </span><span style="color: #0000ff;">private</span> <span style="color: #800080;">$width</span><span style="color: #000000;">;
    </span><span style="color: #0000ff;">private</span> <span style="color: #800080;">$height</span><span style="color: #000000;">;
    </span><span style="color: #0000ff;">function</span> __construct(<span style="color: #800080;">$arr</span>=<span style="color: #000000;">[]){
        </span><span style="color: #0000ff;">if</span>(!<span style="color: #0000ff;">empty</span>(<span style="color: #800080;">$arr</span><span style="color: #000000;">)){
            </span><span style="color: #800080;">$this</span>->width = <span style="color: #800080;">$arr</span>['width'<span style="color: #000000;">];
            </span><span style="color: #800080;">$this</span>->height = <span style="color: #800080;">$arr</span>['height'<span style="color: #000000;">];
        }
        </span><span style="color: #800080;">$this</span>->name = "矩形"<span style="color: #000000;">;
    }
    </span><span style="color: #0000ff;">function</span><span style="color: #000000;"> area() {
        </span><span style="color: #0000ff;">return</span> <span style="color: #800080;">$this</span>->width * <span style="color: #800080;">$this</span>-><span style="color: #000000;">height;
    }
    </span><span style="color: #0000ff;">function</span><span style="color: #000000;"> view() {
        </span><span style="color: #800080;">$form</span> = '<form action="index.php?action=rect" method="post">'<span style="color: #000000;">;
        </span><span style="color: #800080;">$form</span> .=<span style="color: #800080;">$this</span>->name.'的寬:<input name="width" value=""/><br>'<span style="color: #000000;">;
        </span><span style="color: #800080;">$form</span> .=<span style="color: #800080;">$this</span>->name.'的高:<input name="height" value=""/><br>'<span style="color: #000000;">;
        </span><span style="color: #800080;">$form</span> .='<input type="submit" name="dosubmit" value="計(jì)算"><br>'<span style="color: #000000;">;
        </span><span style="color: #800080;">$form</span> .='</form>'<span style="color: #000000;">;
        </span><span style="color: #0000ff;">echo</span> <span style="color: #800080;">$form</span><span style="color: #000000;">;
    }
    </span><span style="color: #0000ff;">function</span> test(<span style="color: #800080;">$arr</span><span style="color: #000000;">) {
        </span><span style="color: #800080;">$bg</span> = <span style="color: #0000ff;">true</span><span style="color: #000000;">;
        </span><span style="color: #0000ff;">if</span>(<span style="color: #800080;">$arr</span>['width'] < 0<span style="color: #000000;">) {
            </span><span style="color: #0000ff;">echo</span> <span style="color: #800080;">$this</span>->name."的寬不能小于0!<br>"<span style="color: #000000;">;
            </span><span style="color: #800080;">$bg</span> = <span style="color: #0000ff;">false</span><span style="color: #000000;">;    
        }
        </span><span style="color: #0000ff;">if</span>(<span style="color: #800080;">$arr</span>['height'] < 0<span style="color: #000000;">) {
            </span><span style="color: #0000ff;">echo</span> <span style="color: #800080;">$this</span>->name."的高度不能小于0!<br>"<span style="color: #000000;">;
            </span><span style="color: #800080;">$bg</span> = <span style="color: #0000ff;">false</span><span style="color: #000000;">;
        }
        </span><span style="color: #0000ff;">return</span> <span style="color: #800080;">$bg</span><span style="color: #000000;">;
    }
}
</span>?>
        

        

         
        

        Triangle class
        

        

        <span style="color: #008000;">//</span><span style="color: #008000;">triangle.class.php</span>
<?<span style="color: #000000;">php
</span><span style="color: #0000ff;">class</span> Triangle <span style="color: #0000ff;">extends</span><span style="color: #000000;"> Shape{
    </span><span style="color: #0000ff;">private</span> <span style="color: #800080;">$b1</span><span style="color: #000000;">;
    </span><span style="color: #0000ff;">private</span> <span style="color: #800080;">$b2</span><span style="color: #000000;">;
    </span><span style="color: #0000ff;">private</span> <span style="color: #800080;">$b3</span><span style="color: #000000;">;
    </span><span style="color: #0000ff;">function</span> __construct(<span style="color: #800080;">$arr</span>=<span style="color: #000000;">[]){
        </span><span style="color: #0000ff;">if</span>(!<span style="color: #0000ff;">empty</span>(<span style="color: #800080;">$arr</span><span style="color: #000000;">)){
            </span><span style="color: #800080;">$this</span>->b1 = <span style="color: #800080;">$arr</span>['b1'<span style="color: #000000;">];
            </span><span style="color: #800080;">$this</span>->b2 = <span style="color: #800080;">$arr</span>['b2'<span style="color: #000000;">];
            </span><span style="color: #800080;">$this</span>->b3 = <span style="color: #800080;">$arr</span>['b3'<span style="color: #000000;">];
        }
        </span><span style="color: #800080;">$this</span>->name = "三角形"<span style="color: #000000;">;
    }
    </span><span style="color: #0000ff;">function</span><span style="color: #000000;"> area() {
        </span><span style="color: #800080;">$p</span> = (<span style="color: #800080;">$this</span>->b1 + <span style="color: #800080;">$this</span>->b2 + <span style="color: #800080;">$this</span>->b3)/2<span style="color: #000000;">;
        </span><span style="color: #0000ff;">return</span> <span style="color: #008080;">sqrt</span>(<span style="color: #800080;">$p</span>*(<span style="color: #800080;">$p</span>-<span style="color: #800080;">$this</span>->b1)*(<span style="color: #800080;">$p</span>-<span style="color: #800080;">$this</span>->b2)*(<span style="color: #800080;">$p</span>-<span style="color: #800080;">$this</span>-><span style="color: #000000;">b3));
    }
    </span><span style="color: #0000ff;">function</span><span style="color: #000000;"> view() {
        </span><span style="color: #800080;">$form</span> = '<form action="index.php?action=triangle" method="post">'<span style="color: #000000;">;
        </span><span style="color: #800080;">$form</span> .=<span style="color: #800080;">$this</span>->name.'第一個(gè)邊的寬:<input name="b1" value=""/><br>'<span style="color: #000000;">;
        </span><span style="color: #800080;">$form</span> .=<span style="color: #800080;">$this</span>->name.'第二個(gè)邊的寬:<input name="b2" value=""/><br>'<span style="color: #000000;">;
        </span><span style="color: #800080;">$form</span> .=<span style="color: #800080;">$this</span>->name.'第三個(gè)邊的寬:<input name="b3" value=""/><br>'<span style="color: #000000;">;
        </span><span style="color: #800080;">$form</span> .='<input type="submit" name="dosubmit" value="計(jì)算"><br>'<span style="color: #000000;">;
        </span><span style="color: #800080;">$form</span> .='</form>'<span style="color: #000000;">;
        </span><span style="color: #0000ff;">echo</span> <span style="color: #800080;">$form</span><span style="color: #000000;">;
    }
    </span><span style="color: #0000ff;">function</span> test(<span style="color: #800080;">$arr</span><span style="color: #000000;">) {
        </span><span style="color: #800080;">$bg</span> = <span style="color: #0000ff;">true</span><span style="color: #000000;">;
        </span><span style="color: #0000ff;">if</span>(<span style="color: #800080;">$arr</span>['b1'] < 0<span style="color: #000000;">) {
            </span><span style="color: #0000ff;">echo</span> "第一個(gè)邊的寬不能小于0!<br>"<span style="color: #000000;">;
            </span><span style="color: #800080;">$bg</span> = <span style="color: #0000ff;">false</span><span style="color: #000000;">;    
        }
        </span><span style="color: #0000ff;">if</span>(<span style="color: #800080;">$arr</span>['b2'] < 0<span style="color: #000000;">) {
            </span><span style="color: #0000ff;">echo</span> "第二個(gè)邊的寬不能小于0!<br>"<span style="color: #000000;">;
            </span><span style="color: #800080;">$bg</span> = <span style="color: #0000ff;">false</span><span style="color: #000000;">;    
        }
        </span><span style="color: #0000ff;">if</span>(<span style="color: #800080;">$arr</span>['b3'] < 0<span style="color: #000000;">) {
            </span><span style="color: #0000ff;">echo</span> "第三個(gè)邊的寬不能小于0!<br>"<span style="color: #000000;">;
            </span><span style="color: #800080;">$bg</span> = <span style="color: #0000ff;">false</span><span style="color: #000000;">;    
        }
        </span><span style="color: #0000ff;">if</span>((<span style="color: #800080;">$arr</span>['b1'] + <span style="color: #800080;">$arr</span>['b2'] < <span style="color: #800080;">$arr</span>['b3'])||(<span style="color: #800080;">$arr</span>['b1'] + <span style="color: #800080;">$arr</span>['b3'] < <span style="color: #800080;">$arr</span>['b2'])||(<span style="color: #800080;">$arr</span>['b3'] + <span style="color: #800080;">$arr</span>['b2'] < <span style="color: #800080;">$arr</span>['b1'<span style="color: #000000;">])){
            </span><span style="color: #0000ff;">echo</span> '兩邊之和不能小于第三邊<br>'<span style="color: #000000;">;
            </span><span style="color: #800080;">$bg</span> = <span style="color: #0000ff;">false</span><span style="color: #000000;">;
        }
        </span><span style="color: #0000ff;">return</span> <span style="color: #800080;">$bg</span><span style="color: #000000;">;
    }
}
</span>?>
        

        

        

        


						
        
					
        
					
        
						
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