基於GD2圖形庫的PHP產生圖片縮圖類代碼分享，_PHP教程

基於GD2圖形庫的PHP產生圖片縮圖類代碼分享，

要使用PHP產生圖片縮圖,要保證你的PHP伺服器安裝了GD2圖形庫 使用一個類產生圖片的縮圖

1.使用方法

$resizeimage = new resizeimage("圖片源檔案地址", "200", "100", "0","縮圖地址");//就只用上面的一句話,就能產生縮圖,其中,源檔案和縮圖地址可以相同,200,100分別代表寬和高

2. 縮圖類代碼

//使用如下類就可以產生圖片縮圖, <?phpclass resizeimage{  //圖片類型  var $type;  //實際寬度  var $width;  //實際高度  var $height;  //改變後的寬度  var $resize_width;  //改變後的高度  var $resize_height;  //是否裁圖  var $cut;  //源圖象  var $srcimg;  //靶心圖表象地址  var $dstimg;  //臨時建立的圖象  var $im;   function resizeimage($img, $wid, $hei,$c,$dstpath)  {    $this->srcimg = $img;    $this->resize_width = $wid;    $this->resize_height = $hei;    $this->cut = $c;    //圖片的類型  $this->type = strtolower(substr(strrchr($this->srcimg,"."),1));     //初始化圖象    $this->initi_img();    //靶心圖表象地址    $this -> dst_img($dstpath);    //--    $this->width = imagesx($this->im);    $this->height = imagesy($this->im);    //產生圖象    $this->newimg();    ImageDestroy ($this->im);  }  function newimg()  {    //改變後的圖象的比例    $resize_ratio = ($this->resize_width)/($this->resize_height);    //實際圖象的比例    $ratio = ($this->width)/($this->height);    if(($this->cut)=="1")    //裁圖    {      if($ratio>=$resize_ratio)      //高度優先      {        $newimg = imagecreatetruecolor($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)      //寬度優先      {        $newimg = imagecreatetruecolor($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,$this->dstimg);      }    }    else    //不裁圖    {      if($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,$this->dstimg);      }    }  }  //初始化圖象  function initi_img()  {    if($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);    }  }  //圖象目標地址  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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