PHP Object-Oriented Programming exercise: Calculate the perimeter and area of a rectangle, triangle, circle

Just finished learning PHP object-oriented programming, referring to the Gaulo Teacher's PHP tutorial to learn this example.

Chip

Here is the implementation code:

index.php

Form.class.php_ This is the form class _
 

<?php//returns different form class form{private $action according to the value of the different action submitted in index;        Private $shape;            Constructor method function __construct ($action = "") {$this->action = $action;        $this->shape=isset ($_request["action"])? $_request["Action"]: "rect";            } function __tostring () {//Todo:implement __tostring () method.  $form = ' <form action= '. $this->action. ' "            Method= "POST" > ";                    Switch ($this->shape) {case "rect": $form. = $this->getrect ();                Break                    Case "triangle": $form. = $this->gettriangle ();                Break                    Case "Circle": $form. = $this->getcircle ();                Break            Default: $form. = ' Please select a shape <br> ';            } $form. = ' <input type= "Submit" Name= "sub" value= "Calculation" > ";   $form. = ' </form> ';         return $form;            } Private Function GetRect () {$input = ' <b> Please enter | rectangle | Width and height:</b><p> '; $input. = ' width: <input type= "text" name= "width" value= "'. $_post[' width ']. '"            ><br> '; $input. = ' Height: <input type= "text" name= "height" value= "'. $_post[' height ']. '"            ><br> ';            $input. = ' <input type= ' hidden ' name= ' action ' value= ' rect ' > ';        return $input;            } Private Function Gettriangle () {$input = ' <b> Please enter | triangle | of three-side:</b><p> ';            $input. = ' first side: <input type= ' text "name=" side1 "value=" '. $_post[' Side1 ']. ' ><br> ';            $input. = ' second side: <input type= "text" name= "Side2" value= "'. $_post[' Side2 ']. ' ><br> ';            $input. = ' third side: <input type= "text" name= "side3" value= "'. $_post[' Side3 ']. ' ><br> ';            $input. = ' <input type= ' hidden ' name= ' action ' value= ' triangle ' > ';        return $input; } private function Getcircle () {$input = ' <b> Please enter | circle | radius:</b><p> ';            $input. = ' Radius: <input type= "text" name= "radius" value= "'. $_post[' radius ']. ' ><br> ';            $input. = ' <input type= ' hidden ' name= ' action ' value= ' Circle ' > ';        return $input; }}/** * Created by Phpstorm. * User:user * DATE:2018/4/15 * time:16:26 * */
Shape.class.php This is an abstract class used to define the canonical

<?phpabstract class Shape {public    $shapeName;    The area (), perimeter () method must be in the canonical circle, Triangle, and rect to    abstract function area ();    Abstract function perimeter ();    Public Function Setshapename ($shapeName)    {        $this->shapename = $shapeName;        return $this;    }    Determines whether the number entered is a valid number greater than 0    protected function validate ($value, $message = "shape") {        if ($value = = "" "| |! Is_numeric ($value) | | $value < 0) {            echo ' <font color= ' red ' > '. $message. ' must be a non-negative number and cannot be empty </font><br> ';            return false;        } else {            return true;}}    } /** * Created by Phpstorm. * User:user * DATE:2018/4/15 * time:16:42 * *
CIRCLE.CLASS.PHP_ is the calculation of the circumference and area of the formula _

<?phpclass Circle extends Shape {    private $radius =0;    function __construct () {        $this->shapename= "Circle";        if ($this->validate ($_post[' radius '), ' radius of circle ') {            $this->radius=$_post["radius"];        } else{            exit;        }    }    function area () {        return pi () * $this->radius* $this->radius;    }    function perimeter () {        return 2*pi () * $this->radius;    }} /** * Created by Phpstorm. * User:user * DATE:2018/4/15 * time:17:06 * *
rect.class.php

<?phpclass Rect extends shape{    private $width =0;    Private $height =0;    function __construct ()    {        $this->shapename= "Rectangle";        if ($this->validate ($_post["width"], ' rectangle widths ') & $this->validate ($_post["height"], ' rectangle '))        {            $ this->width=$_post["width"];            $this->height=$_post["height"];        }        else{            exit;        }    }    function area () {        return $this->width* $this->height;    }    function perimeter ()    {        return 2 * ($this->width + $this->height);}    } /** * Created by Phpstorm. * User:user * DATE:2018/4/15 * time:17:02 * *
triangle.class.php

<?phpclass Triangle extends shape{private $side 1=0;    Private $side 2=0;    Private $side 3=0;        function __construct () {$this->shapename= "triangle";        if ($this->validate ($_post[' side1 '), ' first edge of triangle ') {$this->side1=$_post["side1"];        } if ($this->validate ($_post[' Side2 '), ' second side of the triangle ') {$this->side2=$_post["side2"];        } if ($this->validate ($_post[' side3 '), ' third edge of triangle ') {$this->side3=$_post["side3"];            } if (! $this->validatesum ()) {echo ' <font color= ' red ' > triangle must be greater than the third side </font> ';        Exit        }} function area () {$s = ($this->side1+ $this->side2+ $this->side3)/2;    return sqrt ($s * ($s-$this->side1) * ($s-$this->side2) * ($s-$this->side3));    } function perimeter () {return $this->side1+ $this->side2+ $this->side3; } Private Function Validatesum () {$condition 1 = ($this->side1 + $this->side2) > $this->side3;        $condition 2 = ($this->side1 + $this->side3) > $this->side2;        $condition 3 = ($this->side2 + $this->side3) > $this->side1;        if ($condition 1 && $condition 2 && $condition 3) {return true;        } else {return false; }}}/** * Created by Phpstorm. * User:user * DATE:2018/4/15 * time:17:04 * *
Result.class.php_ Here is the return calculation result class _
 

<?php class result{Private $shape; function __construct () {switch ($_post[' action ') {case ' rect ': $this-                    >shape=new Rect ();                Break                    Case ' triangle ': $this->shape=new triangle ();                Break                    Case ' Circle ': $this->shape=new circle ();                Break            Default: $this->shape=false; }}/** * @return String */function __tostring () {//Todo:implem            Ent __tostring () method. if ($this->shape) {$result = $this->shape->shapename. ' Perimeter: '. $this->shape->perimeter (). '                <br> '; $result. = $this->shape->shapename. ' Area: '. $this->shape->area (). '                <br> ';            return $result;            }else{return ' without this shape ';   }     }}/** * Created by Phpstorm. * User:user * DATE:2018/4/15 * time:16:47 * *