validate_fileExtension

Validation of image file upload for allowed file extensions

Located at helpers\validation_helper.php

Parameters
`array`	`$value`	The $_FILES array	#
`array`	`$extensions = ['jpg', 'jpeg', 'png', 'gif']`	The Array of file extensions such as `array('jpg', 'jpeg', 'png', 'gif')`	#

Returns
`boolean`	TRUE if the uploaded file extension is allowed according to the given extensions, FALSE otherwise