Hello Friends,
If you want to check the file existence in Word Press or you want to check file type is right or not. Wordpress provide an inbuilt functionality to check this with validate_file(). Please look at below examples for the same:
// Define allowed file type
$extension = array('jpg', 'jpeg', 'gif', 'png');
// Path for the file
$path = 'uploads/2016/01/abcxyz.jpg';
// Check file vaildation
$flag = validate_file($path, $extension);
// Return values meaning
$flag == 0 // mean file exist
$flag == 1 // mean file invalid
$flag == 2 // mean file invalid
$flag == 3 // mean file extension not allowed
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