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

這篇文章主要介紹了基於GD2圖形庫的PHP產生圖片縮圖類代碼分享,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

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1 2	$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

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//使用如下類就可以產生圖片縮圖, 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; //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; } }

http://www.bkjia.com/PHPjc/955275.htmlwww.bkjia.comtruehttp://www.bkjia.com/PHPjc/955275.htmlTechArticle基於GD2圖形庫的PHP產生圖片縮圖類代碼分享 這篇文章主要介紹了基於GD2圖形庫的PHP產生圖片縮圖類代碼分享,本文直接給出實現代碼和...

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