Check if string only contains numbers in php

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

`ctype_digit` does exactly what you want https://3v4l.org/YcOSo — u_mulder, Jan 29 '18 at 07:30
Are you sure the input was a string? `ctype_digit` only works with strings, not numbers. — Barmar, Jan 29 '18 at 07:34
I know this is several years old now, but the suggested duplicate is for Javascript, whereas this question is about PHP so is not particularly helpful. — Steven Green, Feb 23 '22 at 13:28

score 22 · Accepted Answer · answered Jan 29 '18 at 07:29

22

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 '18 at 07:29

Kasia Gogolek

score 5 · Answer 2 · answered Jan 29 '18 at 07:29

5

what about

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

answered Jan 29 '18 at 07:29

2 Answers2