使用模式匹配PHP的字符串图像源

I have in a variable $var = 'src="some-http-source" ' i want to get the value inside the inverts as a variable using pattern matching in php please help

$var = 'src="some-http-source"';
$matched = array();
preg_match('@src="(.+)"@', $var, $matches);
echo $matches[1]; // there it is!