thumb_stand.php<?php// http://localhost/exa5/thumb_image/thumb_stand.php?w=200&h=200// 把大图缩略到缩略图指定的范围内,可能有留白（原图细节不丢失）$w = $_GET['w']?$_GET['w']:200;$h = $_GET['h']?$_GET['h']:200;$filename = "stand_test_".$w."_".$h.".jpg";image_resize( 'test.jpg',$filename, $w, $h);header("content-type:image/png");//设定生成图片格式echo file_get_contents($filename);function image_resize($f, $t, $tw, $th){// 按指定大小生成缩略图，而且不变形，缩略图函数 $temp = array(1=>'gif', 2=>'jpeg', 3=>'png'); list($fw, $fh, $tmp) = getimagesize($f); if(!$temp[$tmp]){ return false; } $tmp = $temp[$tmp]; $infunc = "imagecreatefrom$tmp"; $outfunc = "image$tmp"; $fimg = $infunc($f); // 使缩略后的图片不变形，并且限制在 缩略图宽高范围内 if($fw/$tw > $fh/$th){ $th = $tw*($fh/$fw); }else{ $tw = $th*($fw/$fh); } $timg = imagecreatetruecolor($tw, $th); imagecopyresampled($timg, $fimg, 0,0, 0,0, $tw,$th, $fw,$fh); if($outfunc($timg, $t)){ return true; }else{ return false; }}?>thumb_cut.php<?php// http://localhost/exa5/thumb_image/thumb_cut.php?w=200&h=200// 把大图缩略到缩略图指定的范围内，不留白（原图会居中缩放，把超出的部分裁剪掉）$w = $_GET['w']?$_GET['w']:200;$h = $_GET['h']?$_GET['h']:200;$filename = "cut_test_".$w."_".$h.".jpg";image_resize( 'test.jpg',$filename, $w, $h);header("content-type:image/png");//设定生成图片格式echo file_get_contents($filename);// 按指定大小生成缩略图，而且不变形，缩略图函数function image_resize($f, $t, $tw, $th){ $temp = array(1=>'gif', 2=>'jpeg', 3=>'png'); list($fw, $fh, $tmp) = getimagesize($f); if(!$temp[$tmp]){ return false; } $tmp = $temp[$tmp]; $infunc = "imagecreatefrom$tmp"; $outfunc = "image$tmp"; $fimg = $infunc($f);// $fw = 10;// $fh = 4;// $tw = 4;// $th = 2; // 把图片铺满要缩放的区域 if($fw/$tw > $fh/$th){ $zh = $th; $zw = $zh*($fw/$fh); $_zw = ($zw-$tw)/2; }else{ $zw = $tw; $zh = $zw*($fh/$fw); $_zh = ($zh-$th)/2; }// echo $zw."<br>"; // echo $zh."<br>"; // echo $_zw."<br>"; // echo $_zh."<br>"; // exit; $zimg = imagecreatetruecolor($zw, $zh); // 先把图像放满区域 imagecopyresampled($zimg, $fimg, 0,0, 0,0, $zw,$zh, $fw,$fh); // 再截取到指定的宽高度 $timg = imagecreatetruecolor($tw, $th); imagecopyresampled($timg, $zimg, 0,0, 0+$_zw,0+$_zh, $tw,$th, $zw-$_zw*2,$zh-$_zh*2);// if($outfunc($timg, $t)){ return true; }else{ return false; }}?>thumb_strict.php<?php// http://localhost/exa5/thumb_image/thumb_strict.php?w=200&h=200// 把大图缩略到缩略图指定的范围内，不留白（原图会剪切掉不符合比例的右边和下边）$w = $_GET['w']?$_GET['w']:200;$h = $_GET['h']?$_GET['h']:200;$filename = "strict_test_".$w."_".$h.".jpg";image_resize( 'test.jpg',$filename, $w, $h);header("content-type:image/png");//设定生成图片格式echo file_get_contents($filename);function image_resize($f, $t, $tw, $th){// 按指定大小生成缩略图，而且不变形，缩略图函数 $temp = array(1=>'gif', 2=>'jpeg', 3=>'png'); list($fw, $fh, $tmp) = getimagesize($f); if(!$temp[$tmp]){ return false; } $tmp = $temp[$tmp]; $infunc = "imagecreatefrom$tmp"; $outfunc = "image$tmp"; $fimg = $infunc($f); if($fw/$tw > $fh/$th){ $fw = $tw * ($fh/$th); }else{ $fh = $th * ($fw/$tw); } $timg = imagecreatetruecolor($tw, $th); imagecopyresampled($timg, $fimg, 0,0, 0,0, $tw,$th, $fw,$fh); if($outfunc($timg, $t)){ return true; }else{ return false; }}?>
转：http://www.oschina.net/code/snippet_140043_22321
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