How to batch generate image thumbnails in PHP, _PHP tutorial
PHP批量生成图片缩略图的方法,
本文实例讲述了PHP批量生成图片缩略图的方法。分享给大家供大家参考。具体如下:
<?php //用PHP批量生成图片缩略图 function mkdirs($dirname,$mode=0777) //创建目录(目录, [模式]) { if(!is_dir($dirname)) { mkdirs($dirname,$mode); //如果目录不存在,递归建立 return mkdir($dirname,$mode); } return true; } function savefile($filename,$content='') //保存文件(文件, [内容]) { if(function_exists(file_put_contents)) { file_put_contents($filename,$content); } else { $fp=fopen($filename,"wb"); fwrite($fp,$content); fclose($fp); } } function getsuffix($filename) //获取文件名后缀 { return end(explode(".",$filename)); } function checksuffix($filename,$arr) //是否为允许类型(当前, 允许) { if(!is_array($arr)) { $arr=explode(",",str_replace(" ","",$arr)); } return in_array($filename,$arr) ? 1 : 0; } class image { var $src; //源地址 var $newsrc; //新图路径(本地化后) var $allowtype=array(".gif",".jpg",".png",".jpeg"); //允许的图片类型 var $regif=0; //是否缩略GIF, 为0不处理 var $keep=0; //是否保留源文件(1为保留, 0为MD5) var $over=0; //是否可以覆盖已存在的图片,为0则不可覆盖 var $dir; //图片源目录 var $newdir; //处理后的目录 function __construct($olddir=null,$newdir=null) { $this->dir=$olddir ? $olddir : "./images/temp"; $this->newdir=$newdir ? $newdir : "./images/s"; } function reNames($src) { $md5file=substr(md5($src),10,10).strrchr($src,"."); //MD5文件名后(例如:3293okoe.gif) $md5file=$this->w."_".$this->h."_".$md5file; //处理后文件名 return $this->newdir."/".$md5file; //将源图片,MD5文件名后保存到新的目录里 } function Mini($src,$w,$h,$q=80) //生成缩略图 Mini(图片地址, 宽度, 高度, 质量) { $this->src=$src; $this->w=$w; $this->h=$h; if(strrchr($src,".")==".gif" && $this->regif==0) //是否处理GIF图 { return $this->src; } if($this->keep==0) //是否保留源文件,默认不保留 { $newsrc=$this->reNames($src); //改名后的文件地址 } else //保持原名 { $src=str_replace("\\","/",$src); $newsrc=$this->newdir.strrchr($src,"/"); } if(file_exists($newsrc) && $this->over==0) //如果已存在,直接返回地址 { return $newsrc; } if(strstr($src,"http://") && !strstr($src,$_SERVER['HTTP_HOST'])) //如果是网络文件,先保存 { $src=$this->getimg($src); } $arr=getimagesize($src); //获取图片属性 $width=$arr[0]; $height=$arr[1]; $type=$arr[2]; switch($type) { case 1: //1 = GIF, $im=imagecreatefromgif($src); break; case 2: //2 = JPG $im=imagecreatefromjpeg($src); break; case 3: //3 = PNG $im=imagecreatefrompng($src); break; default: return 0; } //处理缩略图 $nim=imagecreatetruecolor($w,$h); $k1=round($h/$w,2); $k2=round($height/$width,2); if($k1<$k2) { $width_a=$width; $height_a=round($width*$k1); $sw=0; $sh=($height-$height_a)/2; } else { $width_a=$height/$k1; $height_a=$height; $sw=($width-$width_a)/2; $sh = 0; } //生成图片 if(function_exists(imagecopyresampled)) { imagecopyresampled($nim,$im,0,0,$sw,$sh,$w,$h,$width_a,$height_a); } else { imagecopyresized($nim,$im,0,0,$sw,$sh,$w,$h,$width_a,$height_a); } if(!is_dir($this->newdir)) { mkdir($this->newdir); } switch($type) //保存图片 { case 1: $rs=imagegif($nim,$newsrc); break; case 2: $rs=imagejpeg($nim,$newsrc,$q); break; case 3: $rs=imagepng($nim,$newsrc); break; default: return 0; } return $newsrc; //返回处理后路径 } function getimg($filename) { $md5file=$this->dir."/".substr(md5($filename),10,10).strrchr($filename,"."); if(file_exists($md5file)) { return $md5file; } //开始获取文件,并返回新路径 $img=file_get_contents($filename); if($img) { if(!is_dir($this->dir)) { mkdir($this->dir); } savefile($md5file,$img); return $md5file; } } function reImg($src,$w,$h,$q) //转换缩略图(文件名和结构不变) { $this->keep=1; return $this->Mini($src,$w,$h,$q); //return 生成的地址 } } $image=new image(); echo $image->reImg("images/zht.jpg",75,75,80); echo "<br/>"; echo $image->reImg("images/m8920.jpg",75,75,80); echo "<br/>"; echo $image->getimg("./images/s/zht.jpg"); ?>
希望本文所述对大家的php程序设计有所帮助。

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