php 获取图片扩展
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Get image extension
提问by Oto Shavadze
I want get uploaded image extension.
我想要上传图片扩展名。
As I know, best way is getimagesize()function.
据我所知，最好的方法是getimagesize()功能。
but this function's mime, returns image/jpegwhen image has .jpgor also .JPEGextension.
但是这个函数的 mime，image/jpeg当图像有.jpg或也有.JPEG扩展时返回。
How can get exactly extension?
怎样才能得到准确的扩展？
回答by lupatus
you can use image_type_to_extensionfunction with image type returned by getimagesize:
您可以使用image_type_to_extension具有以下图像类型的函数getimagesize：
$info = getimagesize($path);
$extension = image_type_to_extension($info[2]);
回答by phpalix
$ext = pathinfo($filename, PATHINFO_EXTENSION);
回答by vasudev
You can also use strrpos and substr functions to get extension of any file
您还可以使用 strrpos 和 substr 函数来获取任何文件的扩展名
$filePath="images/ajax-loader.gif";
$type=substr($filePath,strrpos($filePath,'.')+1);
echo "file type=".$type;
output: gif
输出：gif
if you want extension like .gif
如果你想要像 .gif 这样的扩展名
$type=substr($filePath,strrpos($filePath,'.')+0);
output: .gif
输出：.gif
回答by Devang Rathod
$image = explode(".","test.file.hhh.kkk.jpg");
echo end($image);
回答by dfsq
One more way to do it:
另一种方法：
$ext = strrchr($filename, "."); // .jpg
回答by Siki
You can also explode the file name with dots and take the end of the array as follows:
你也可以用点来分解文件名并取数组的末尾，如下所示：
$ext = end(explode('.', 'image.name.gif'));
According to: Two different ways to find file extension in PHP
And a new way for you lol:
还有一种新的方式给你哈哈：
$ext = explode('.', 'file.name.lol.lolz.jpg');
echo $ext[count($ext) - 1];
回答by 49volro
For those who want to check if image type is JPEG, PNG or etc. You can use exif_imagetypefunction. This function reads the first bytes of an image and checks its signature. Here is a simple example from php.net:
对于那些想要检查图像类型是否为 JPEG、PNG 等的人，您可以使用exif_imagetype函数。此函数读取图像的第一个字节并检查其签名。这是来自 php.net 的一个简单示例：
<?php
if (exif_imagetype('image.gif') != IMAGETYPE_GIF) {
echo 'The picture is not a gif';
}
?>
回答by eozzy
$size = getimagesize($filename);
$ext = explode('/', $size['mime'])[1];
回答by James
$file_ext = pathinfo($_FILES["file"]["name"], PATHINFO_EXTENSION);
or to make it clean
或者让它干净
$filename= $_FILES["file"]["name"];
$file_ext = pathinfo($filename,PATHINFO_EXTENSION);
