How to make a class in PHP that can add watermarks and generate thumbnails

php中世界最好的语言
Release: 2023-03-26 22:34:01
Original
1531 people have browsed it

This time I will show you how to make a class in PHP that can add watermarks and generate thumbnails. PHP can make a class that can add watermarks and generate thumbnails. NotesWhat are they? Here are actual cases. Let’s take a look.

ImageTool.class.php

<?php
class ImageTool
{
  private $imagePath;//图片路径
  private $outputDir;//输出文件夹
  private $memoryImg;//内存图像
  public function construct($imagePath, $outputDir = null)
  {
    $this->imagePath = $imagePath;
    $this->outputDir = $outputDir;
    $this->memoryImg = null;
  }
  /**
   * 显示内存中的图片
   * @param $image
   */
  public function showImage()
  {
    if ($this->memoryImg != null) {
      $info = getimagesize($this->imagePath);
      $type = image_type_to_extension($info[2], false);
      header('Content-type:' . $info['mime']);
      $funs = "image{$type}";
      $funs($this->memoryImg);
      imagedestroy($this->memoryImg);
      $this->memoryImg = null;
    }
  }
  /**将图片以文件形式保存
   * @param $image
   */
  private function saveImage($image)
  {
    $info = getimagesize($this->imagePath);
    $type = image_type_to_extension($info[2], false);
    $funs = "image{$type}";
    if (empty($this->outputDir)) {
      $funs($image, md5($this->imagePath) . '.' . $type);
    } else {
      $funs($image, $this->outputDir . md5($this->imagePath) . '.' . $type);
    }
  }
  /**
   * 压缩图片
   * @param $width 压缩后宽度
   * @param $height 压缩后高度
   * @param bool $output 是否输出文件
   * @return resource
   */
  public function compressImage($width, $height, $output = false)
  {
    $image = null;
    $info = getimagesize($this->imagePath);
    $type = image_type_to_extension($info[2], false);
    $fun = "imagecreatefrom{$type}";
    $image = $fun($this->imagePath);
    $thumbnail = imagecreatetruecolor($width, $height);
    imagecopyresampled($thumbnail, $image, 0, 0, 0, 0, $width, $height, $info[0], $info[1]);
    imagedestroy($image);
    if ($output) {
      $this->saveImage($thumbnail);
    }
    $this->memoryImg = $thumbnail;
    return $this;
  }
  /**
   * 为图像添加文字标记
   *
   * @param $content 文本内容
   * @param $size 字体大小
   * @param $font 字体样式
   * @param bool $output 是否输出文件
   * @return $this
   */
  public function addTextmark($content, $size, $font, $output = false)
  {
    $info = getimagesize($this->imagePath);
    $type = image_type_to_extension($info[2], false);
    $fun = "imagecreatefrom{$type}";
    $image = $fun($this->imagePath);
    $color = imagecolorallocatealpha($image, 0, 0, 0, 80);
    $posX = imagesx($image) - strlen($content) * $size / 2;
    $posY = imagesy($image) - $size / 1.5;
    imagettftext($image, $size, 0, $posX, $posY, $color, $font, $content);
    if ($output) {
      $this->saveImage($image);
    }
    $this->memoryImg = $image;
    return $this;
  }
  /**
   * 为图片添加水印
   *
   * @param $watermark 水印图片路径
   * @param $alpha 水印透明度(0-100)
   * @param bool $output 是否输出文件
   * @return $this
   */
  public function addWatermark($watermark, $alpha, $output = false)
  {
    $image_info = getimagesize($this->imagePath);
    $image_type = image_type_to_extension($image_info[2], false);
    $image_fun = "imagecreatefrom{$image_type}";
    $image = $image_fun($this->imagePath);
    $mark_info = getimagesize($watermark);
    $mark_type = image_type_to_extension($mark_info[2], false);
    $mark_fun = "imagecreatefrom{$mark_type}";
    $mark = $mark_fun($watermark);
    $posX = imagesx($image) - imagesx($mark);
    $posY = imagesy($image) - imagesy($mark);
    imagecopymerge($image, $mark, $posX, $posY, 0, 0, $mark_info[0], $mark_info[1], $alpha);
    if ($output) {
      $this->saveImage($image);
    }
    $this->memoryImg = $image;
    return $this;
  }
}
Copy after login

ImageTool usage

First import the ImageTool tool:

require_once 'ImageTool.class.php';
Copy after login

Then instantiate the ImageTool object:

$imageTool = new ImageTool('img/oppman.jpeg', 'out/');//图片路径、输出文件夹
Copy after login

1. Generate compressed images

$imageTool->compressImage(350, 250, true);//压缩宽度、压缩高度、是否保存
$imageTool->showImage();
Copy after login

2. Add text watermark

$imageTool->addTextmark('一拳超人', 50, 'res/micro.ttf', true);//内容、尺寸、字体、是否保存
$imageTool->showImage();
Copy after login

3.Add pictureWatermark

$imageTool->addWatermark('res/logo.jpeg', 100, true);//水印路径、透明度、是否保存
$imageTool->showImage();
Copy after login

Only used as temporary image output:

$imageTool->addTextmark('快捷输出', 50, 'res/micro.ttf')->showImage();
Copy after login

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the PHP Chinese website!

Recommended reading:

Detailed explanation of the steps to implement mongoDB singleton mode operation class in php

tp5 (thinkPHP5) operates mongoDB database Detailed explanation of steps

The above is the detailed content of How to make a class in PHP that can add watermarks and generate thumbnails. For more information, please follow other related articles on the PHP Chinese website!

Related labels:
source:php.cn
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Popular Tutorials
More>
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template