Check if string only contains numbers in php [duplicate]

Question

I want to detect if a string I have contain only number, not containing a letter, comma, or dot. For example like this:

083322 -> valid
55403.22 -> invalid
1212133 -> valid
61,23311 -> invalid
890022 -> valid
09e22 -> invalid

I already used is_numeric and ctype_digit but it's not valid

Are you sure the input was a string? ctype_digit only works with strings, not numbers. — Barmar
– Barmar, Commented Jan 29, 2018 at 7:34

Kasia Gogolek · Accepted Answer · 2018-01-29 07:29:07Z

27

You want to use preg_match in that case as both 61,23311 and 55403.22 are valid numbers (depending on locale). i.e.

if (preg_match("/^\d+$/", $number)) {
    return "is valid"
} else {
    return "invalid"
}

answered Jan 29, 2018 at 7:29

Kasia Gogolek

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1 Comment

PHP Guru Over a year ago

This could match digits in other locales that aren't 0-9 which isn't what you want. Replace \d with [0-9] or use ctype_digit() php.net/manual/en/function.ctype-digit.php

Nikos Gkogkopoulos · Accepted Answer · 2018-01-29 07:29:18Z

11

what about

if (preg_match('/^[0-9]+$/', $str)) {
  echo "valid";
} else {
  echo "invalid";
}

answered Jan 29, 2018 at 7:29

Nikos Gkogkopoulos

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