php 调用未定义的函数 exif_imagetype()
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Call to undefined function exif_imagetype()
提问by Subedi Kishor
I am trying to get Mime-Typefor image-typesas follow:
我试图让Mime-Type为image-types如下：
if(!empty($_FILES['uploadfile']['name']) && $_FILES['uploadfile']['error'] == 0){
$file = $_FILES['uploadfile']['tmp_name'];
$file_type = image_type_to_mime_type(exif_imagetype($file));
switch($file_type){
// Codes Here
}
}
But it always gives the error Call to undefined function exif_imagetype(). What am I doing wrong here?
但它总是给出错误Call to undefined function exif_imagetype()。我在这里做错了什么？
回答by samayo
Enable the following extensions in php.iniand restart your server.
启用以下扩展php.ini并重新启动服务器。
extension=php_mbstring.dll
extension=php_exif.dll
扩展名=php_mbstring.dll
扩展名=php_exif.dll
Then check phpinfo()to see if it is set to on/off
然后检查phpinfo()它是否设置为开/关
回答by aesede
I think the problem is PHP config and/or version, for example, in my case:
我认为问题在于 PHP 配置和/或版本，例如，就我而言：
We know exif_imagetype()takes a file path or resource and returns a constant like IMAGETYPE_GIF
and image_type_to_mime_type()takes that constant value and returns a string 'image/gif', 'image/jpeg', etc.
This didn't work (missing function exif_imagetype), so I've found that image_type_to_mime_type()can also take an integer 1, 2, 3, 17, etc. as input,
so solved the problem using getimagesize, which returns an integer value as mime type:
我们知道exif_imagetype()需要一个文件路径或资源，并返回像IMAGETYPE_GIF一个常数，image_type_to_mime_type()采用的是恒定值，并返回一个字符串'image/gif'，'image/jpeg'等等。这并没有工作（缺少功能exif_imagetype），所以我发现， image_type_to_mime_type()还可以采取整数1 , 2, 3, 17 等作为输入，所以使用 getimagesize 解决了这个问题，它返回一个整数值作为 mime 类型：
function get_image_type ( $filename ) {
$img = getimagesize( $filename );
if ( !empty( $img[2] ) )
return image_type_to_mime_type( $img[2] );
return false;
}
echo get_image_type( 'my_ugly_file.bmp' );
// returns image/x-ms-bmp
echo get_image_type( 'path/pics/boobs.jpg' );
// returns image/jpeg
回答by Imane Fateh
Add this to your code so as we could know which version of php you do have because this function is only supported by (PHP version 4 >= 4.3.0, PHP 5).
将此添加到您的代码中，以便我们知道您使用的是哪个版本的 php，因为此功能仅受 (PHP version 4 >= 4.3.0, PHP 5) 支持。
<?php
phpinfo();
?>
It may be not installed, you can add this part of code to make sure it is :
它可能没有安装，您可以添加这部分代码以确保它是：
<?php
if (function_exists('exif_imagetype')) {
echo "This function is installed";
} else {
echo "It is not";
}
?>
