PHP生成等比縮略圖類和自定義函數分享

2024-09-04 11:43:16

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這篇文章主要介紹了PHP生成等比縮略圖類和自定義函數分享,分別封裝成了一個類和自定義函數,需要的朋友可以參考下。

共有兩種等比例縮略圖方法可以借鑒

一、為類文件，實例化之后即可使用

二、為自定義方法，比較輕巧

類文件代碼如下:

$resizeimage = new resizeimage("./shawn.jpg", "200", "100", "0","../pic/shawnsun.jpg");

//實例化下面的類,就能生成縮略圖

//其中,源文件和縮略圖地址可以相同,200,100分別代表寬和高，第四個參數為可選 0不截圖，1為截圖

<?php

class resizeimage{

 //圖片類型

 public $type;

 //實際寬度

 public $width;

 //實際高度

 public $height;

 //改變后的寬度

 public $resize_width;

 //改變后的高度

 public $resize_height;

 //是否裁圖

 public $cut;

 //源圖象

 public $srcimg;

 //目標圖象地址

 public $dstimg;

 //臨時創建的圖象

 public $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();

 //目標圖象地址

 $this->dst_img($dstpath);

 //W & H

 $this->width = imagesx($this->im);

 $this->height = imagesy($this->im);

 //生成圖象

 $this->newimg();

 ImageDestroy ($this->im);

 }



 function newimg(){



 //改變后的圖象的比例

 $resize_ratio = ($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;

 }

}

?>

自定義方法，代碼如下:

thumbs('shawn.jpg','shawnsun.jpg',100,100);

<?php

function thumbs($FileName,$SaveTo,$SetW,$SetH){

 $IMGInfo= getimagesize($FileName);

 if(!$IMGInfo) return false;



 if($IMGInfo['mime']== "image/pjpeg" || $IMGInfo['mime']=="image/jpeg"){

 $ThisPhoto= imagecreatefromjpeg($FileName);

 }elseif($IMGInfo['mime']== "image/x-png" || $IMGInfo['mime']== "image/png"){

 $ThisPhoto= imagecreatefrompng($FileName);

 }elseif($IMGInfo['mime']== "image/gif"){

 $ThisPhoto=imagecreatefromgif($FileName);

 }



 $width=$IMGInfo[0];

 $height=$IMGInfo[1];

 $scalc = max($width/$SetW,$height/$SetH);

 $nw = intval($width/$scalc);

 $nh = intval($height/$scalc);

 echo "縮略大?。簑$nw,h$nh ";



 if($SetW-$nw == 1){$nw = $SetW;}

 if($SetH-$nh == 1){$nh = $SetH;}

 echo "+修正1像素： w$nw,h$nh ";



 //補寬

 if($SetW-$nw > 0){

 $nh = $nh +(($nh/$nw) * ($SetW-$nw));

 echo "*需補寬".($SetW-$nw).",陪補高".(($nh/$nw) * ($SetW-$nw))." ";

 $nw = $SetW;

 }

 //補高

 if($SetH-$nh > 0){

 $nw = $nw + (($nw/$nh) * ($SetH-$nh));

 echo "*需補高".($SetH-$nh).",陪補寬". (($nw/$nh) * ($SetH-$nh)) ." ";

 $nh = $SetH;

 }

 $nw = intval($nw);

 $nh = intval($nh);

 echo "+修正大?。簑$nw,h$nh ";



 $px = ($SetW - $nw)/2;

 $py = ($SetH - $nh)/2;

 echo "窗口大?。簑$SetW,h$SetH ";

 echo "+偏移修正：x$px,y$py ";



 $NewPhoto=imagecreatetruecolor($SetW,$SetH);

 imagecopyresized($NewPhoto,$ThisPhoto,$px,$py,0,0,$nw,$nh,$width,$height);

 ImageJpeg ($NewPhoto,$SaveTo);

 return true;

}



?>