利用php GD库 文字图片水印 缩略图
GD库是php中一个默认的强大的图片处理库了,我们可以利用它来对图片进行一些操作或生成图片的操作,下面我们来看文字图片水印缩略图在php中的实例。
一:添加文字水印 使用方法
<?php require 'image.class.php'; $src = "001.jpg"; $content = "hello"; $font_url = "my.ttf"; $size = 20; $image = new Image($src); $color = array( 0 => 255, 1 => 255, 2 => 255, 2 => 20 ); $local = array( 'x' => 20, 'y' => 30 ); $angle = 10; $image->fontMark($content, $font_url, $size, $color, $local, $angle); $image->show();
二:图片缩略图使用方法:
require 'image.class.php'; $src = "001.jpg"; $image = new Image($src); $image->thumb(300, 200); $image->show();
三:image.class.php
class image { private $info; private $image; public function __contruct($src) { $info = getimagesize($src); $this->info = array( 'width' => $info[0], 'height' => $info[1], 'type' => image_type_to_extension($info[2], false) , 'mime' => $info['mime'], ); $fun = "imagecreatefrom{$this->info['type']}"; $this->image = $fun($src); } //缩略图 public function thumd($width, $height) { $image_thumb = imagecreatetruecolor($width, $height); imagecopyresampled($image_thumb, $this->image, 0, 0, 0, 0, $width, $height, $this->info['width'], $this->info['height']); imagedestroy($this->image); $this->image = $image_thumb; } //文字水印 public function fontMark($content, $font_url, $size, $color, $local, $angle) { $col = imagecolorallocatealpha($this->image, $color[0], $color[1], $color[2], $color[3]); $text = imagettftext($this->image, $size, $angle, $local['x'], $local['y'], $col, $font_url, $content); } //输出图片 public function show() { header("Content-type:", $this->info['mime']); $func = "image{$this->info['type']}"; $func($this->image); } public function save($nwename) { $func = "image{$this->info['type']}"; //从内存中取出图片显示 $func($this->image); //保存图片 $func($this->image, $nwename . $this->info['type']); } public function _destruct() { imagedestroy($this->image); } }
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