PHP uploads images to generate thumbnails (GD library)-PHP Tutorial-php.cn

PHP uploads images to generate thumbnails (GD library)

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Release： 2016-07-29 09:07:34

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首先来一段简单的php上传图片生成缩略图的详细代码，分享给大家供大家参考，具体内容如下

<&#63;php
function createThumbnail($imageDirectory, $imageName, $thumbDirectory, $thumbWidth, $quality){
$details = getimagesize("$imageDirectory/$imageName") or die('Please only upload images.');
$type = preg_replace('@^.+(&#63;<=/)(.+)$@', '$1', $details['mime']);
eval('$srcImg = imagecreatefrom'.$type.'("$imageDirectory/$imageName");');
$thumbHeight = $details[1] * ($thumbWidth / $details[0]);
$thumbImg = imagecreatetruecolor($thumbWidth, $thumbHeight);
imagecopyresampled($thumbImg, $srcImg, 0, 0, 0, 0, $thumbWidth, $thumbHeight,
$details[0], $details[1]);
eval('image'.$type.'($thumbImg, "$thumbDirectory/$imageName"'.
(($type=='jpeg')&#63;', $quality':'').');');
imagedestroy($srcImg);
imagedestroy($thumbImg);
}
foreach ($_FILES["pictures"]["error"] as $key => $error) {
if ($error == UPLOAD_ERR_OK) {
$tmp_name = $_FILES["pictures"]["tmp_name"][$key];
$name = $_FILES["pictures"]["name"][$key];
move_uploaded_file($tmp_name, "data/$name");
createThumbnail("/location/of/main/image", $name, "/location/to/store/thumb", 120, 80);
//120 = thumb width :: 80 = thumb quality (1-100)
}
}
?>

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接下来再为大家推荐一个实例php使用GD库上传图片以及创建缩略图，直接看代码：

GD库是PHP进行图象操作一个很强大的库。

先在php.ini里增加一行引用：extension=php_gd2.dll

重启apache，做一个测试页var_dump(gd_info());输出数据表明GD库引用成功。

图片上传页面 upload.html

<html>
<head>
<meta http-equiv='Content-Type' c />";
 }
?>

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希望对大家学习php程序设计有所帮助，谢谢大家的支持。

以上就介绍了php上传图片生成缩略图（GD库），包括了方面的内容，希望对PHP教程有兴趣的朋友有所帮助。