PHPでサムネイルを生成する方法の紹介

'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; } } ?>

'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."
"; // echo $zh."
"; // echo $_zw."
"; // echo $_zh."
"; // 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; } } ?>

'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; } } ?>