Undefined index: x

I ask you if it is safe and enough to add an isset() to $data['x'] in the first line of the snippet
to fix the undefined index error. This is the context:
		foreach ($data['x'] as $fldnum=>$val)
			if($xsubcatfields[$fldnum]['TYPE'] == "N" && !preg_match("/^[0-9]*$/", $val))
				$fldname = $xsubcatfields[$fldnum]['NAME'];
				$numerr .= " &nbsp; - {$fldname}<br />";
	if($numerr) $err .= "&bull; $lang[ERROR_POST_MUST_BE_NUMBER]<br />$numerr";
	if($err) $err = $lang['POST_ERRORS'] . $err;

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Ashish PatelCommented:
Yes it is safe to use isset function and as to check if $data is defined or undefined you will have to use isset() around the $data variable.
You would need it at the if:
if(isset($data['x']) && is_array($data['x']))

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