Notice: Undefined index: sku in PHP problem solution_PHP tutorial

Notice: Undefined index: sku in PHP Problem Solution

This is not a bug, but a warning. When using $_GET[] or $_POST[] without adding isset or other judgments, this error will be prompted. The solution suggested by Jones perfectly solves this problem:

/*
 * 取代$_GET[]获取值
 */
function _get($str) {
	$val = !empty($_GET[$str]) ? $_GET[$str] : null;
	return $val;
}

/*
 * 取代$_POST[]获取值
 */
function _post($str) {
	$val = !empty($_POST[$str]) ? $_POST[$str] : null;
	return $val;
}

When using, the usage is as follows:

/** 设置当前页数 */
$page = _get('page');
$inventory->setCurrentPage($page);

/** 计算总页数 */
$sku = _post('sku');
$warehouse = _post('warehouse');
$supplier = _post('supplier');

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