php上传图片生成缩略图

如何用php上传图片生成缩略图，还阐述了利用GD库上传图片以及创建缩略图，感兴趣的小伙伴们可以参考一下。

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

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<?php

function createThumbnail($imageDirectory, $imageName, $thumbDirectory, $thumbWidth, $quality){

$details = getimagesize("$imageDirectory/$imageName") or die('Please only upload images.');

$type = preg_replace('@^.+(?<=/)(.+)$@', '$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')?', $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)

}

}