PHP object-oriented and process-oriented methods to add text watermarks to pictures, _PHP tutorial

PHP has two methods: object-oriented and process-oriented to add text watermarks to pictures.

Currently, the vast majority of PHP programmers use the process-oriented method, because parsing the WEB page itself is very complex. "Procedural" (from one label to another). Embedding procedural code in HTML is straightforward and natural, so PHP programmers often use this approach.

If you are new to PHP, writing code in a process-oriented style is probably your only option. But if you frequent PHP forums and newsgroups, you should see articles about "objects". You may also have seen tutorials on how to write object-oriented PHP code. Or you may have downloaded some off-the-shelf class libraries and tried to instantiate objects and use class methods - although you may not really understand why these classes work, or why you need to use object-oriented methods to implement functions. .

Should we use the "object-oriented" style or the "process-oriented" style? Both sides have supporters. Comments like "the object is inefficient" or "the object is great" are also heard from time to time. This article does not attempt to easily determine which of the two methods has the absolute advantage, but rather to find out the advantages and disadvantages of each method.

1: Object-oriented implementation uses PHP to add watermarks to images

class Image_class {
  private $image;
  private $info;
  /**
   * @param $src:图片路径
   * 加载图片到内存中
   */
  function __construct($src){
    $info = getimagesize($src);
    $type = image_type_to_extension($info[2],false);
    $this -> info =$info;
    $this->info['type'] = $type;
    $fun = "imagecreatefrom" .$type;
    $this -> image = $fun($src);
  }
  /**
   * @param $fontsize: 字体大小
   * @param $x: 字体在图片中的x位置
   * @param $y: 字体在图片中的y位置
   * @param $color: 字体的颜色是一个包含rgba的数组
   * @param $text: 想要添加的内容
   * 操作内存中的图片,给图片添加文字水印
   */
  public function fontMark($fontsize,$x,$y,$color,$text){
    $col = imagecolorallocatealpha($this->image,$color[0],$color[1],$color[2],$color[3]);
    imagestring($this->image,$fontsize,$x,$y,$text,$col);
  }
  /*
   * 输出图片到浏览器中
   */
  public function show(){
    header('content-type:' . $this -> info['mime']);
    $fun='image' . $this->info['type'];
    $fun($this->image);
  }
  /**
   * 销毁图片
   */
  function __destruct(){
    imagedestroy($this->image);
  }
}
//对类的调用
$obj = new Image_class('001.png');
$obj->fontMark(20,20,30,array(255,255,255,60),'hello');
$obj->show();

2: Process-oriented writing method using PHP to add watermarks to images:

//指定图片路径
$src = '001.png';
//获取图片信息
$info = getimagesize($src);
//获取图片扩展名
$type = image_type_to_extension($info[2],false);
//动态的把图片导入内存中
$fun = "imagecreatefrom{$type}";
$image = $fun('001.png');
//指定字体颜色
$col = imagecolorallocatealpha($image,255,255,255,50);
//指定字体内容
$content = 'helloworld';
//给图片添加文字
imagestring($image,5,20,30,$content,$col);
//指定输入类型
header('Content-type:'.$info['mime']);
//动态的输出图片到浏览器中
$func = "image{$type}";
$func($image);
//销毁图片
imagedestroy($image);

The above code example introduces two methods of object-oriented and process-oriented PHP to add text watermarks to images. I hope you like it.

http://www.bkjia.com/PHPjc/1049125.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/1049125.htmlTechArticlePHP has two methods, object-oriented and process-oriented, to add text watermarks to images. Currently, the vast majority of PHP programmers use the object-oriented and process-oriented methods. A procedural approach, because parsing the WEB page itself is very "procedural"...