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１，生成缩图
代码
<?php
///生成縮圖 ///$resizeimage=new resizeimage($filesaved,$dstimg,250,250); class resizeimage { var $type; var $width; var $height; var $resize_width; var $resize_height; var $srcimg; var $dstimg; var $im; var $desiredRatio; function resizeimage($srcimg,$dstimg, $wid, $hei) { $this->srcimg = $srcimg; $this->dstimg = $dstimg; //圖片的類型 $this->type = substr(strrchr($this->srcimg,"."),1); //初始化圖像 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); //目標圖像寬和高 $this->width = imagesx($this->im); $this->height = imagesy($this->im); //計算縮圖的寬和高 //若需要生產的縮圖的寬和高都大於源圖的寬高時都不需要縮小 if( ($this->width<=$wid) && ($this->height<=$hei) ){ $this->resize_width=$this->width; $this->resize_height=$this->height; }else{ //若寬的縮小比例小於高的縮小比例時,則成生的縮圖的寬為$wid if( ($wid/$this->width) < ($hei/$this->height) ){ $this->desiredRatio=$wid/$this->width; $this->resize_width=$wid; $this->resize_height=(int)($this->height*$this->desiredRatio); //若寬的縮小比例大於高的縮小比例時,則生成的縮圖的高為$hei }else{ $this->desiredRatio=$hei/$this->height; $this->resize_height=$hei; $this->resize_width=(int)($this->width*$this->desiredRatio); } } //生成圖像 $this->newimg(); //销毁一图像 ImageDestroy ($this->im); } function newimg() { $newimg = imagecreatetruecolor($this->resize_width,$this->resize_height); imagecopyresampled($newimg, $this->im, 0, 0, 0, 0, $this->resize_width, $this->resize_height, $this->width, $this->height) ; ImageJpeg ($newimg,$this->dstimg); } } ?>
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2022-08-17
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