PHP生成缩略图函数
程序员文章站
2024-01-14 21:46:58
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$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) //有宽无高 { $propor = $dst_w / $src_w; $height = $dst_h = $src_h * $propor; } else if(!$dst_w && $dst_h) //有高无宽 { $propor = $dst_h / $src_h; $width = $dst_w = $src_w * $propor; } } } else { if(!$dst_h) //裁剪时无高 { $height = $dst_h = $dst_w; } if(!$dst_w) //裁剪时无宽 { $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); }