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/** * 產生縮圖 * @author [email protected] * @param string 源圖絕對完整地址{帶檔案名稱及尾碼名} * @param string 靶心圖表絕對完整地址{帶檔案名稱及尾碼名} * @param int 縮圖寬{0:此時目標高度不能為0,目標寬度為源圖寬*(目標高度/源圖高)} * @param int 縮圖高{0:此時目標寬度不能為0,目標高度為源圖高*(目標寬度/源圖寬)} * @param int 是否裁切{寬,高必須非0} * @param int/float 縮放{0:不縮放, 0<this<1:縮放到相應比例(此時寬高限制和裁切均失效)} * @return boolean */function img2thumb($src_img, $dst_img, $width = 75, $height = 75, $cut = 0, $proportion = 0){ if(!is_file($src_img)){ return false; } $ot = fileext($dst_img); $otfunc = ‘image‘ . ($ot == ‘jpg‘ ? ‘jpeg‘ : $ot); $srcinfo = getimagesize($src_img); $src_w = $srcinfo[0]; $src_h = $srcinfo[1]; $type = strtolower(substr(image_type_to_extension($srcinfo[2]), 1)); $createfun = ‘imagecreatefrom‘ . ($type == ‘jpg‘ ? ‘jpeg‘ : $type); $dst_h = $height; $dst_w = $width; $x = $y = 0; //縮圖不超過源圖尺寸(前提是寬或高只有一個) if(($width> $src_w && $height> $src_h) || ($height> $src_h && $width == 0) || ($width> $src_w && $height == 0)){ $proportion = 1; } if($width> $src_w){ $dst_w = $width = $src_w; } if($height> $src_h){ $dst_h = $height = $src_h; } if(!$width && !$height && !$proportion){ return false; } if(!$proportion){ if($cut == 0){ if($dst_w && $dst_h){ if($dst_w/$src_w> $dst_h/$src_h){ $dst_w = $src_w * ($dst_h / $src_h); $x = 0 - ($dst_w - $width) / 2; }else{ $dst_h = $src_h * ($dst_w / $src_w); $y = 0 - ($dst_h - $height) / 2; } }else if($dst_w xor $dst_h){ if($dst_w && !$dst_h){ //有寬無高 $propor = $dst_w / $src_w; $height = $dst_h = $src_h * $propor; }else if(!$dst_w && $dst_h){ //有高無寬 $propor = $dst_h / $src_h; $width = $dst_w = $src_w * $propor; } } }else{ if(!$dst_h){ //裁剪時無高 $height = $dst_h = $dst_w; } if(!$dst_w){ //裁剪時無寬 $width = $dst_w = $dst_h; } $propor = min(max($dst_w / $src_w, $dst_h / $src_h), 1); $dst_w = (int)round($src_w * $propor); $dst_h = (int)round($src_h * $propor); $x = ($width - $dst_w) / 2; $y = ($height - $dst_h) / 2; } }else{ $proportion = min($proportion, 1); $height = $dst_h = $src_h * $proportion; $width = $dst_w = $src_w * $proportion; } $src = $createfun($src_img); $dst = imagecreatetruecolor($width ? $width : $dst_w, $height ? $height : $dst_h); $white = imagecolorallocate($dst, 255, 255, 255); imagefill($dst, 0, 0, $white); if(function_exists(‘imagecopyresampled‘)){ imagecopyresampled($dst, $src, $x, $y, 0, 0, $dst_w, $dst_h, $src_w, $src_h); }else{ imagecopyresized($dst, $src, $x, $y, 0, 0, $dst_w, $dst_h, $src_w, $src_h); } $otfunc($dst, $dst_img); imagedestroy($dst); imagedestroy($src); return true;}function fileext($file){ return pathinfo($file, PATHINFO_EXTENSION);}
php產生縮圖函數