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标题 基于GD2图形库的PHP生成图片缩略图类代码分享
内容
    这篇文章主要介绍了基于GD2图形库的PHP生成图片缩略图类代码分享,本文直接给出实现代码和使用方法,需要的朋友可以参考下
    要使用PHP生成图片缩略图,要保证你的PHP服务器安装了GD2图形库 使用一个类生成图片的缩略图
    1.使用方法
    $resizeimage = new resizeimage("图片源文件地址", "200", "100", "0","缩略图地址");
    //就只用上面的一句话,就能生成缩略图,其中,源文件和缩略图地址可以相同,200,100分别代表宽和高
    2. 缩略图类代码
    //使用如下类就可以生成图片缩略图,
    <?php
    class resizeimage
    {
    //图片类型
    var $type;
    //实际宽度
    var $width;
    //实际高度
    var $height;
    //改变后的宽度
    var $resize_width;
    //改变后的高度
    var $resize_height;
    //是否裁图
    var $cut;
    //源图象
    var $srcimg;
    //目标图象地址
    var $dstimg;
    //临时创建的图象
    var $im;
    function resizeimage($img, $wid, $hei,$c,$dstpath)
    {
    $this->srcimg = $img;
    $this->resize_width = $wid;
    $this->resize_height = $hei;
    $this->cut = $c;
    //图片的类型
    $this->type = strtolower(substr(strrchr($this->srcimg,"."),1));
    //初始化图象
    $this->initi_img();
    //目标图象地址
    $this -> dst_img($dstpath);
    //--
    $this->width = imagesx($this->im);
    $this->height = imagesy($this->im);
    //生成图象
    $this->newimg();
    ImageDestroy ($this->im);
    }
    function newimg()
    {
    //改变后的图象的比例
    $resize_ratio = ($this->resize_width)/($this->resize_height);
    //实际图象的比例
    $ratio = ($this->width)/($this->height);
    if(($this->cut)=="1")
    //裁图
    {
    if($ratio>=$resize_ratio)
    //高度优先
    {
    $newimg = imagecreatetruecolor($this->resize_width,$this->resize_height);
    imagecopyresampled($newimg, $this->im, 0, 0, 0, 0, $this->resize_width,$this->resize_height, (($this->height)*$resize_ratio), $this->height);
    ImageJpeg ($newimg,$this->dstimg);
    }
    if($ratio<$resize_ratio)
    //宽度优先
    {
    $newimg = imagecreatetruecolor($this->resize_width,$this->resize_height);
    imagecopyresampled($newimg, $this->im, 0, 0, 0, 0, $this->resize_width, $this->resize_height, $this->width, (($this->width)/$resize_ratio));
    ImageJpeg ($newimg,$this->dstimg);
    }
    }
    else
    //不裁图
    {
    if($ratio>=$resize_ratio)
    {
    $newimg = imagecreatetruecolor($this->resize_width,($this->resize_width)/$ratio);
    imagecopyresampled($newimg, $this->im, 0, 0, 0, 0, $this->resize_width, ($this->resize_width)/$ratio, $this->width, $this->height);
    ImageJpeg ($newimg,$this->dstimg);
    }
    if($ratio<$resize_ratio)
    {
    $newimg = imagecreatetruecolor(($this->resize_height)*$ratio,$this->resize_height);
    imagecopyresampled($newimg, $this->im, 0, 0, 0, 0, ($this->resize_height)*$ratio, $this->resize_height, $this->width, $this->height);
    ImageJpeg ($newimg,$this->dstimg);
    }
    }
    }
    //初始化图象
    function initi_img()
    {
    if($this->type=="jpg")
    {
    $this->im = imagecreatefromjpeg($this->srcimg);
    }
    if($this->type=="gif")
    {
    $this->im = imagecreatefromgif($this->srcimg);
    }
    if($this->type=="png")
    {
    $this->im = imagecreatefrompng($this->srcimg);
    }
    }
    //图象目标地址
    function dst_img($dstpath)
    {
    $full_length = strlen($this->srcimg);
    $type_length = strlen($this->type);
    $name_length = $full_length-$type_length;
    $name = substr($this->srcimg,0,$name_length-1);
    $this->dstimg = $dstpath;
    //echo $this->dstimg;
    }
    }
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更新时间:2025/5/21 18:33:06