Php从数组值获取文件扩展名

时间:2012-11-28 08:00:00

标签: php

我是新的PHP,这是学习过程。

我有一个html上传表单。我正在尝试重命名上传的文件。所以以下是获取文件扩展名的php代码,之后我添加了一个php uniqid();重命名它。

获取文件扩展名代码:

$img = $_FILES['images']['name'];

function getExtension($str)
{
     $i = strrpos($str,".");
     if (!$i) { return ""; } 

     $l = strlen($str) - $i;
     $ext = substr($str,$i+1,$l);
     return $ext;
}

$extension =  getExtension($img);
$id = uniqid();
$newimg = $id.'.'.$extension;

嗯,这对我来说只有一个上传文件,但是,如果我有多个上传表单,那么如何通过此功能获得多个文件扩展?

获取以下多个文件是我的PHP代码:

$uploaded_files = array();
$upload_directory = dirname(__file__) . '/uploaded/'; //set upload directory    


for ($i = 0; $i < count($_FILES['images']['name']); $i++)
            {
                $number_of_file_fields++;

                if ($_FILES['images']['name'][$i] != '')
                { //check if file field empty or not
                    $number_of_uploaded_files++;

$uploaded_files[] = $_FILES['images']['name'][$i];

if (move_uploaded_file($_FILES['images']['tmp_name'][$i], $upload_directory .   $_FILES['images']['name'][$i]))
                    {
                        $number_of_moved_files++;
                    }

                }

            }

Html表格

<table width="1020" border="0" cellspacing="7" cellpadding="0">   
<tr>
 <td valign="top" width="250">
     Upload your property picture
 </td>
 <td>
    <div id="file_container">
        <input name="images[]" type="file" class="tr2"  />
        <br />
    </div>
 <a href="javascript:void(0);" onClick="add_file_field();">Add another</a>
 <input type="submit" value="Save & Continue" name="Submit" class="submit" />
 </td>  
</tr> 
</table>

2 个答案:

答案 0 :(得分:1)

function changeFilename($str)
{
     $pathinfo = pathinfo($str);
     return uniqid() . "." . $pathinfo['extension'];
}
$oldarray = array("hello.txt","ytuwe.php");
$newarray = array_map("changeFilename", $oldarray);
var_dump($newarray);

以下是演示:http://ideone.com/gPi61D

答案 1 :(得分:0)

为什么不使用PHP的pathinfo函数来获取文件扩展名?

$extension = pathinfo($img, PATHINFO_EXTENSION);
$id = uniqid();
$newimg = $id.'.'.$extension;