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; } }
ImageTool usage
First import the ImageTool tool:
require_once 'ImageTool.class.php';
Then instantiate the ImageTool object:
$imageTool = new ImageTool('img/oppman.jpeg', 'out/');//图片路径、输出文件夹
1. Generate compressed images
$imageTool->compressImage(350, 250, true);//压缩宽度、压缩高度、是否保存 $imageTool->showImage();
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();
3.Add pictureWatermark
$imageTool->addWatermark('res/logo.jpeg', 100, true);//水印路径、透明度、是否保存 $imageTool->showImage();
Only used as temporary image output:
$imageTool->addTextmark('快捷输出', 50, 'res/micro.ttf')->showImage();
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!
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