server - How to Identify a File is image or not in PHP -


i have tried getimagesize() , finfo , getting mime type function. have noticed can not trust on these function observed it's fails in case image files. have better way identify file image or not. use case : have 1 file php code inside it. have saved file image extension. want block file getting uploaded.

try php's inbuilt method check image type, 

int exif_imagetype ( string $filename )

this method returns false if file not valid image otherwise return integer pointing type of image.

also throws notice. may this.

if(@exif_imagetype($file)){      //valid image } else {      // invalid }

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