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    ▪php绘制圆形的二个例子 php绘图函数imagearc()、ImagePng()的用法      例1，绘制一个圆形   代码示例: <?php      header ("Content-type: image/png");         $im = ImageCreate (150, 150);      $grey = ImageColorAllocate ($im, 230, 230, 230);      $black = ImageColorAllocate ($im, 0,.........

    ▪php5中抽象类的小例子      php抽象类的实例代码，如下：   代码示例: <?php /** * 定义与使用php抽象类 * edit: www. */      abstract class Number {           private $value;           abstract public function value();   .........

    ▪php类中常量的用法举例      例1，在php类中定义常量   代码示例: <?php class Employee {     //定义常量     const AVAILABLE      = 0;     const OUT_OF_STOCK   = 1;     public $status; } print Employee::AVAILABLE; ?> 例2，定义.........

代码示例:

<?php
     header ("Content-type: image/png");
  
     $im = ImageCreate (150, 150);
     $grey = ImageColorAllocate ($im, 230, 230, 230);
     $black = ImageColorAllocate ($im, 0, 0, 0);
  
     ImageString($im, 3, 5, 5, "Figure 18.5: Circle", $black);
     ImageArc($im, 75, 75, 50, 50, 0, 360, $black);
     ImagePng ($im);
     ImageDestroy ($im);
?>

代码示例:

<?php
header("Content-type: image/png");
$image = imagecreate( 200, 200 );
$red = imagecolorallocate($image, 255,0,0);
$blue = imagecolorallocate($image, 0,0,255 );
imagearc( $image, 99, 99, 180, 180, 0, 360, $blue );
imagefill( $image, 99, 99, $blue );
imagepng($image);
?>

代码示例:

<?php
/**
* 定义与使用php抽象类
* edit: www.
*/
     abstract class Number {
          private $value;
          abstract public function value();
          public function reset() {
               $this->value = NULL;
          }
     }

     class Integer extends Number {
          private $value;
          public function value() {
               return (int)$this->value;
          }
     }

     $num = new Integer; /* Okay */
     $num2 = new Number; /* This will fail */
?>

代码示例:

<?php
class Employee {
    //定义常量
    const AVAILABLE      = 0;
    const OUT_OF_STOCK   = 1;
    public $status;
}
print Employee::AVAILABLE;
?>

代码示例:

<?php
   class math_functions {
    //定义常量
     const PI = '3.14159265';
     const E = '2.7182818284';
     const EULER = '0.5772156649';
     /* 在这里定义其它的常量与方法... */
   }

   echo math_functions::PI;
?>