Convert base64 to image and validation helpers

functions.php

function base64ToImage($imageData, $path){
    $data = 'data:image/png;base64,AAAFBfj42Pj4';
    list($type, $imageData) = explode(';', $imageData);
    list(,$extension) = explode('/',$type);
    list(,$imageData)      = explode(',', $imageData);
    $fileName = uniqid().'.'.$extension;
    $imageData = base64_decode($imageData);
    file_put_contents($path."/".$fileName, $imageData);
    return $fileName;
}

function isBase64($data = ""){
	@list($type, $source) = explode("base64,", $data);
	if (!$source || !$type) {
		return false;
	}
	if ( base64_encode(base64_decode($source)) === $source){
	   return true;
	} else {
	    return false;
	}
}

function isImage($data){
	$uri = substr($data, 5);
	
	$dimension = @getimagesize($data);
	$width = count($dimension) > 0 ? $dimension[0] : 0;
	$height = count($dimension) > 0 ? $dimension[1] : 0;
	
	list($type, $imageData) = explode(';base64,', $uri);
	list(,$extension) = explode('/',$type);
	$size = (int) (strlen(rtrim($imageData, '=')) * 3 / 4);
	$extension = $extension == "jpg" ? "jpeg" : $extension;
	if(function_exists($create="imagecreatefrom".$extension)){
		if($create($data))
			return true;
		else
			return false;
	}else{
		return false;
	}
}

function smallerThan($data, $size){
	$uri = substr($data, 5);
	list($type, $imageData) = explode(';base64,', $uri);
	list(,$extension) = explode('/',$type);
	$filesize = (int) (strlen(rtrim($imageData, '=')) * 3 / 4);
	return $filesize <= $size ? true : false;
}