Php checks whether a string contains numbers.

Php checks whether the string contains digits if (preg_match ('/\ d +/', $ id) echo 'y'; elseecho 'n'; I can see this code online, however, a mistaken man, Dong Yanyan, 2-7-14, yundun district, was determined not to contain the number. in Yudu city, Zhulin town, 549-1, php, determined whether the string contains numbers.
If (preg_match ('/\ d +/', $ id) echo 'y'; else echo 'n ';

I saw this code on the Internet, but I was mistaken.

Dongyan 2-7-14, Yanjing district, Tongshu city, was determined to contain no figures.
The 549-1 judgment in Zhulin town, Yudu city is correct.


Is there any accurate method ???

------ Solution --------------------
\ D is not used
Use [0-90123456789] +