if statement - Integer only if-else condition in php -


I can not be an integer only for the contact number 

  if ($ contactno = "") {$ Error ['contact'] = "contact is required."; } Else {if (! Preg_match ("/ ^ ([1] -)? [0- 9] {3} - [0- 9] {3} - [0- 9] {4} $ / i", $ Contactno)) $ valid_Contactno = $ contacts; } And {$ error ['contactno'] = "number only."; }    
 
 
 Instead, use it to check the numbers.  
  if (ctype_digit ($ contactno)) echo "This is a valid contact number!"; } Else {echo "You can not enter characters other than numbers"; }

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