通过数据识别图像格式[重复]

Question

This question already has an answer here:

• Automatic image format detection in PHP 7 answers

Are there libraries in PHP or JS which can identify image formats by analyzing data? It should support BMP, JPG, GIF, PNG, TIFF and EMF.

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Answer 1

Try this function with PHP getimagesize :-

function is_image($path)
{
$a = getimagesize($path);
$image_type = $a[2];
//Add you image format        
if(in_array($image_type , array(IMAGETYPE_GIF , IMAGETYPE_JPEG ,IMAGETYPE_PNG , IMAGETYPE_BMP)))
{
return true;
}
return false;
}

or you can use exif_imagetype

//Add you image format
if (exif_imagetype('image.gif') != IMAGETYPE_GIF) {
    echo 'The picture is not a gif';
}