php - ctype_digit to only allow 10 digits starting with a 4 -


i using following function allow digits. 

if (empty($vat) || (!(ctype_digit($vat)))) {     $mistakes[] = 'error - title either empty or should contain numbers starting 4.';

is there way can add/modify function accept 10 digits , must start number 4?

you can use regular expressions this:

if(preg_match('/^4\d{9}$/', $vat) == 0){    $mistakes[] = 'error - title either empty or should contain numbers starting 4.'; }

and if ever need match other string or number pattern, site can test regular expression on: regexpal.com it's got pointers , tutorials , learn how match string patterns , test own regular expressions


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