The getimagesize function of php provides lot of information about an image file , including its type. The type can be used to check if the file is a valid image file or not.
To check if a file is an image or not, use the function
function is_image($path)
{
$a = getimagesize($path);
$image_type = $a[2];
if(in_array($image_type , array(IMAGETYPE_GIF , IMAGETYPE_JPEG ,IMAGETYPE_PNG , IMAGETYPE_BMP)))
{
return true;
}
return false;
}
$a[0] and $a[1] are the width and height of the image.
$a[2] has the image type.
Other image formats include :
[IMAGETYPE_GIF] => 1 [IMAGETYPE_JPEG] => 2 [IMAGETYPE_PNG] => 3 [IMAGETYPE_SWF] => 4 [IMAGETYPE_PSD] => 5 [IMAGETYPE_BMP] => 6 [IMAGETYPE_TIFF_II] => 7 [IMAGETYPE_TIFF_MM] => 8 [IMAGETYPE_JPC] => 9 [IMAGETYPE_JP2] => 10 [IMAGETYPE_JPX] => 11 [IMAGETYPE_JB2] => 12 [IMAGETYPE_SWC] => 13 [IMAGETYPE_IFF] => 14 [IMAGETYPE_WBMP] => 15 [IMAGETYPE_JPEG2000] => 9 [IMAGETYPE_XBM] => 16 [IMAGETYPE_ICO] => 17 [IMAGETYPE_UNKNOWN] => 0 [IMAGETYPE_COUNT] => 18
Note :
1. mpeg videos are detected as IMAGETYPE_ICO !!
Link: “http://php.net/manual/en/function.getimagesize.php”.
Quote: “Do not use getimagesize() to check that a given file is a valid image. Use a purpose-built solution such as the Fileinfo extension instead”.
Link to description of that extension: “http://php.net/manual/ru/book.fileinfo.php”.
PHP’s official docs recommend against using getimagesize function for checking if the file is actually an image.
See: http://php.net/getimagesize
Thank You :D
Hey, this is a really good solution. I spent ages looking for a decent function in the php manual, but this really solves my problem!
Thanks a lot!
Tristram
it’s really helpfull !
i simply added “@” before the getimagesize to prevent php outputing error messages on screen if it fails getting image size :
$a = @getimagesize($path);
Thanx :D
I do not recommend using @ operator to suppress errors in PHP. Read https://www.binarytides.com/blog/suppressing-errors-warnings-with-operator-in-php/ for more info.
Link format is outdated, here is actual one:
https://www.binarytides.com/suppress-errors-warnings-with-operator-in-php/