基於GD2圖形庫的PHP生成圖片縮略圖類代碼分享

 這篇文章主要介紹了基於GD2圖形庫的PHP生成圖片縮略圖類代碼分享,本文直接給出實現代碼和使用方法,需要的朋友可以參考下

   

要使用PHP生成圖片縮略圖,要保證你的PHP服務器安裝了GD2圖形庫 使用一個類生成圖片的縮略圖

1.使用方法

? 1 2 $resizeimage = new resizeimage("圖片源文件地址", "200", "100", "0","縮略圖地址"); //就只用上面的一句話,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

2. 縮略圖類代碼

? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 //使用如下類就可以生成圖片縮略圖,   <?php class 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; //目標圖象地址 var $dstimg; //臨時創建的圖象 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(); //目標圖象地址 $this -> dst_img($dstpath); //-- $this->width = imagesx($this->im); $this->height = imagesy($this->im); //生成圖象 $this->newimg(); ImageDestroy ($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; } }