时间:2021-07-01 10:21:17 帮助过:11人阅读
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文件上传是所有web应用中最常见的功能,而PHP实现这一功能也非常的简单,只需要前端设置表单的 enctype 值为 multipart/form-data 之后,我们就可以通过 $_FILES 获得表单中的 file 控件中的内容。
同时,我们还可以将 file 控件的名称写成带 [] 的数组形式,这样我们就可以接收到多个上传的文件。比如下面这个测试用的表单:
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title> </head> <body> <form action="" enctype="multipart/form-data" method="post"> myfile1:<input type="file" name="myfile[]"/><br/> myfile2:<input type="file" name="myfile[a][]"/><br/> myfile3:<input type="file" name="myfile[a][b][]"/><br/> myfile4:<input type="file" name="myfile[c][]"/><br/> myfile5:<input type="file" name="myfile[]"/><br/> myfile6:<input type="file" name="myfile[][]"/><br/> <br/> newfile1:<input type="file" name="newfile[][]"/><br/> newfile2:<input type="file" name="newfile[s]"/><br/> singlefile: <input type="file" name="singlefile"/><br/> <input type="submit" value="submit"/> </form> </body> </html>
一共有9个 file 控件,其中 myfile 和 newfile 都是数组类型的表单名,而 singlefile 则是一个单独的。先简单的看一下 $_FILES 所获得的内容。
print_r($_FILES); Array ( [myfile] => Array ( [name] => Array ( [0] => 2591d8b3eee018a0a84f671933ab6c74.png [a] => Array ( [0] => 12711584942474_.pic_hd 1.jpg [b] => Array ( [0] => 12721584942474_.pic_hd 1.jpg ) ) [c] => Array ( [0] => 12731584942474_.pic_hd.jpg ) [1] => background1.jpg [2] => Array ( [0] => adliu_pip_data.xlsx ) ) [type] => Array ( [0] => image/png [a] => Array ( [0] => image/jpeg [b] => Array ( [0] => image/jpeg ) ) [c] => Array ( [0] => image/jpeg ) [1] => image/jpeg [2] => Array ( [0] => application/vnd.openxmlformats-officedocument.spreadsheetml.sheet ) ) [tmp_name] => Array ( [0] => /private/var/folders/wj/t2z1cfhs0m9gq48krm8nc0vm0000gn/T/phphD88ZY [a] => Array ( [0] => /private/var/folders/wj/t2z1cfhs0m9gq48krm8nc0vm0000gn/T/phpNY8MzY [b] => Array ( [0] => /private/var/folders/wj/t2z1cfhs0m9gq48krm8nc0vm0000gn/T/php3MX5tk ) ) [c] => Array ( [0] => /private/var/folders/wj/t2z1cfhs0m9gq48krm8nc0vm0000gn/T/phpjgrHMj ) [1] => /private/var/folders/wj/t2z1cfhs0m9gq48krm8nc0vm0000gn/T/phppXRtnc [2] => Array ( [0] => /private/var/folders/wj/t2z1cfhs0m9gq48krm8nc0vm0000gn/T/phpekSY1M ) ) [error] => Array ( [0] => 0 [a] => Array ( [0] => 0 [b] => Array ( [0] => 0 ) ) [c] => Array ( [0] => 0 ) [1] => 0 [2] => Array ( [0] => 0 ) ) [size] => Array ( [0] => 4973 [a] => Array ( [0] => 3007 [b] => Array ( [0] => 1156 ) ) [c] => Array ( [0] => 6068 ) [1] => 393194 [2] => Array ( [0] => 36714 ) ) ) [newfile] => Array ( [name] => Array ( [0] => Array ( [0] => 数据列表 (2).xlsx ) [s] => background1.jpg ) [type] => Array ( [0] => Array ( [0] => application/vnd.openxmlformats-officedocument.spreadsheetml.sheet ) [s] => image/jpeg ) [tmp_name] => Array ( [0] => Array ( [0] => /private/var/folders/wj/t2z1cfhs0m9gq48krm8nc0vm0000gn/T/phplSsRfM ) [s] => /private/var/folders/wj/t2z1cfhs0m9gq48krm8nc0vm0000gn/T/phpuQAvRb ) [error] => Array ( [0] => Array ( [0] => 0 ) [s] => 0 ) [size] => Array ( [0] => Array ( [0] => 77032 ) [s] => 393194 ) ) [singlefile] => Array ( [name] => timg (8).jpeg [type] => image/jpeg [tmp_name] => /private/var/folders/wj/t2z1cfhs0m9gq48krm8nc0vm0000gn/T/phpxtSQ4J [error] => 0 [size] => 10273 ) )
看出有什么问题了吗?
$_FILE['singlefile']['name']; $_FILE['singlefile']['type']; $_FILE['singlefile']['tmp_name']; $_FILE['singlefile']['error']; $_FILE['singlefile']['error']; $_FILE['myfile']['name']['a']['b'][0]; $_FILE['myfile']['type']['a']['b'][0]; $_FILE['myfile']['tmp_name']['a']['b'][0]; $_FILE['myfile']['error']['a']['b'][0]; $_FILE['myfile']['error']['a']['b'][0];
单个表单是一个 singlefile 为键名的数组,里面是对应的 name 、 type 等属性。这个非常简单也清晰明了,但是数组形式上传的内容就比较坑了,每一个属性下面都有多个值,而且这些值还有可能是嵌套的数组。
就比如说我们要获得 myfile[a][b][] 的上传文件内容,我们就要通过 \$_FILE[‘myfile’][‘name’][‘a’][‘b’][0] 、 $_FILE[‘myfile’][‘type’][‘a’][‘b’][0] 这样的形式获得相关的内容。
这个可真的不是很友好,那么我们今天的主题就来了,我们把这种内容进行一下格式化,让他变成和 singlefile 类似的结构,也就是一个文件的相关内容都在一个键名结构下,比如 myfile[a][b][] 的内容就全部都在 $_FILE[‘myfile’][a][b][0]下面。
$files = []; // 开始数据格式化 foreach ($_FILES as $uploadKey => $uploadFiles) { // 需要将 $_FILES 中的五个字段都拿出来 $files[$uploadKey] = formatUploadFiles($uploadFiles['name'], $uploadFiles['type'], $uploadFiles['tmp_name'], $uploadFiles['error'], $uploadFiles['size']); } // 格式化上传文件数组 function formatUploadFiles($fileNamesArray, $type, $tmp_name, $error, $size) { $tmpFiles = []; // 文件名是否是数组,如果不是数组,就是单个文件上传 if (is_array($fileNamesArray)) { // 数组形式上传 foreach ($fileNamesArray as $idx => $fileName) { // 如果还是嵌套的数组,递归遍历接下来的内容 if (is_array($fileName)) { $tmpFiles[$idx] = formatUploadFiles($fileName, $type[$idx] ?? [], $tmp_name[$idx] ?? [], $error[$idx] ?? [], $size[$idx] ?? []); } else { // 组合多维的格式化内容 $tmpFiles[$idx] = [ 'name' => $fileName, 'type' => $type[$idx] ?? '', 'tmp_name' => $tmp_name[$idx] ?? '', 'error' => $error[$idx] ?? '', 'size' => $size[$idx] ?? '', ]; } } } else { // 组合单个的内容 $tmpFiles = [ 'name' => $fileName, 'type' => $type ?? '', 'tmp_name' => $tmp_name ?? '', 'error' => $error ?? '', 'size' => $size ?? '', ]; } return $tmpFiles; } print_r($files);
代码还是非常好理解的,就是通过一段递归来遍历整个 $_FILES 目录树,相当于一个深度遍历。当然,这样也会带来性能的下降,毕竟是需要进行循环+递归的遍历。不过好在大部分情况下我们上传的文件并不会那么的多。不过反过来说,如果不事先进行格式化,当你想获得所有的上传内容时,一样还是需要进行多层或者递归遍历的。
接下来我们看看格式化之后的输出:
Array ( [myfile] => Array ( [0] => Array ( [name] => 2591d8b3eee018a0a84f671933ab6c74.png [type] => image/png [tmp_name] => /private/var/folders/wj/t2z1cfhs0m9gq48krm8nc0vm0000gn/T/phpV7A2yC [error] => 0 [size] => 4973 ) [a] => Array ( [0] => Array ( [name] => 12711584942474_.pic_hd 1.jpg [type] => image/jpeg [tmp_name] => /private/var/folders/wj/t2z1cfhs0m9gq48krm8nc0vm0000gn/T/php5q2d1Z [error] => 0 [size] => 3007 ) [b] => Array ( [0] => Array ( [name] => 12721584942474_.pic_hd 1.jpg [type] => image/jpeg [tmp_name] => /private/var/folders/wj/t2z1cfhs0m9gq48krm8nc0vm0000gn/T/phpdvv8No [error] => 0 [size] => 1156 ) ) ) [c] => Array ( [0] => Array ( [name] => 12731584942474_.pic_hd.jpg [type] => image/jpeg [tmp_name] => /private/var/folders/wj/t2z1cfhs0m9gq48krm8nc0vm0000gn/T/php9tfGmp [error] => 0 [size] => 6068 ) ) [1] => Array ( [name] => background1.jpg [type] => image/jpeg [tmp_name] => /private/var/folders/wj/t2z1cfhs0m9gq48krm8nc0vm0000gn/T/phplUVpzA [error] => 0 [size] => 393194 ) [2] => Array ( [0] => Array ( [name] => adliu_pip_data.xlsx [type] => application/vnd.openxmlformats-officedocument.spreadsheetml.sheet [tmp_name] => /private/var/folders/wj/t2z1cfhs0m9gq48krm8nc0vm0000gn/T/phpNRtiaC [error] => 0 [size] => 36714 ) ) ) [newfile] => Array ( [0] => Array ( [0] => Array ( [name] => 数据列表 (2).xlsx [type] => application/vnd.openxmlformats-officedocument.spreadsheetml.sheet [tmp_name] => /private/var/folders/wj/t2z1cfhs0m9gq48krm8nc0vm0000gn/T/phpBLG7aG [error] => 0 [size] => 77032 ) ) [s] => Array ( [name] => background1.jpg [type] => image/jpeg [tmp_name] => /private/var/folders/wj/t2z1cfhs0m9gq48krm8nc0vm0000gn/T/phpjyqCFY [error] => 0 [size] => 393194 ) ) [singlefile] => Array ( [name] => [type] => image/jpeg [tmp_name] => /private/var/folders/wj/t2z1cfhs0m9gq48krm8nc0vm0000gn/T/phpuYJXiE [error] => 0 [size] => 10273 ) )
和上面原始的 $_FILES 相比是不是清晰明了的很多?这回我们如果需要 myfile[a][b][] 里面全部的内容时,就可以使用下面的方式方便的获取了:
re class="brush:php;toolbar:false;">$files['myfile']['a']['b'][0]['name']; $files['myfile']['a']['b'][0]['type']; $files['myfile']['a']['b'][0]['tmp_name']; $files['myfile']['a']['b'][0]['error']; $files['myfile']['a']['b'][0]['size'];
当然,这种需求在我们的日常工作中并不多见,这里也只是提供一个思路,将数据提前转化成我们需要的格式是一种非常好的习惯,能够让我们的后续操作变得非常简单。
以上就是PHP多文件上传如何实现格式化的详细内容,更多请关注gxlcms其它相关文章!