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php生成縮略圖的兩種方法
在php中如果要生成縮略圖有什么辦法呢？以下是小編整理的兩種方法，希望對大家有用，更多消息請關(guān)注應(yīng)屆畢業(yè)生網(wǎng)。
核心代碼如下
public function getImage(){
// create instance
$basePath = base_path('public/');
$md5 = 'b8c3bf0b10a81c5b6a98c527868a0000';
$sub1 = substr($md5, 0, 1);
$sub2 = substr($md5, 1, 2);
$subPath = sprintf("image/%s/%s/%s%s.jpg", $sub1, $sub2, $md5, '300x300');
$sourcePath = sprintf("image/%s/%s/%s.jpg", $sub1, $sub2, $md5);
//截成100x80的縮略圖
//$image = $this->getCropper($basePath.$sourcePath,$basePath.$subPath, 300, 300);
$image = $this->getCrops($basePath.$sourcePath,$basePath.$subPath, 300, 300);
}
//生成縮略圖
function getCropper($source_path,$NewImagePath, $target_width, $target_height)
{
$source_info = getimagesize($source_path);
$source_width = $source_info[0];
$source_height = $source_info[1];
$source_mime = $source_info['mime'];
$source_ratio = $source_height / $source_width;
$target_ratio = $target_height / $target_width;
// 源圖過高
if ($source_ratio > $target_ratio)
{
$cropped_width = $source_width;
$cropped_height = $source_width * $target_ratio;
$source_x = 0;
$source_y = ($source_height - $cropped_height) / 2;
}
// 源圖過寬
elseif ($source_ratio < $target_ratio)
{
$cropped_width = $source_height / $target_ratio;
$cropped_height = $source_height;
$source_x = ($source_width - $cropped_width) / 2;
$source_y = 0;
}
// 源圖適中
else
{
$cropped_width = $source_width;
$cropped_height = $source_height;
$source_x = 0;
$source_y = 0;
}
switch ($source_mime)
{
case 'image/gif':
$source_image = imagecreatefromgif($source_path);
break;
case 'image/jpeg':
$source_image = imagecreatefromjpeg($source_path);
break;
case 'image/png':
$source_image = imagecreatefrompng($source_path);
break;
default:
return false;
break;
}
$target_image = imagecreatetruecolor($target_width, $target_height);
$cropped_image = imagecreatetruecolor($cropped_width, $cropped_height);
// 圖片裁剪
imagecopy($cropped_image, $source_image, 0, 0, $source_x, $source_y, $cropped_width, $cropped_height);
// 圖片縮放
imagecopyresampled($target_image, $cropped_image, 0, 0, 0, 0, $target_width, $target_height, $cropped_width, $cropped_height);
header('Content-Type: image/jpeg');
imagejpeg($target_image,$NewImagePath,100);
imagedestroy($source_image);
imagedestroy($target_image);
imagedestroy($cropped_image);
}
//生成縮略圖，填充白邊
function getCrops($src_path,$NewImagePath,$width,$height){
//源圖對象
$src_image = imagecreatefromstring(file_get_contents($src_path));
$source_info = getimagesize($src_path);
$source_mime = $source_info['mime'];
$src_width = imagesx($src_image);
$src_height = imagesy($src_image);
switch ($source_mime)
{
case 'image/gif':
$src_image = imagecreatefromgif($src_path);
break;
case 'image/jpeg':
$src_image = imagecreatefromjpeg($src_path);
break;
case 'image/png':
$src_image = imagecreatefrompng($src_path);
break;
default:
return false;
break;
}
//生成等比例的縮略圖
//$tmp_image_width = 0;
//$tmp_image_height = 0;
if ($src_width / $src_height >= $width / $height) {
$tmp_image_width = $width;
$tmp_image_height = round($tmp_image_width * $src_height / $src_width);
} else {
$tmp_image_height = $height;
$tmp_image_width = round($tmp_image_height * $src_width / $src_height);
}
$tmpImage = imagecreatetruecolor($tmp_image_width, $tmp_image_height);
imagecopyresampled($tmpImage, $src_image, 0, 0, 0, 0, $tmp_image_width, $tmp_image_height, $src_width, $src_height);
//添加白邊
$final_image = imagecreatetruecolor($width, $height);
$color = imagecolorallocate($final_image, 255, 255, 255);
imagefill($final_image, 0, 0, $color);
$x = round(($width - $tmp_image_width) / 2);
$y = round(($height - $tmp_image_height) / 2);
imagecopy($final_image, $tmpImage, $x, $y, 0, 0, $tmp_image_width, $tmp_image_height);
//輸出圖片
header('Content-Type: image/jpeg');
imagejpeg($final_image,$NewImagePath,100);
imagedestroy($src_image);
imagedestroy($final_image);
}
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