php7 how to check, that only int values in html form

Question

this code accepts numbers, e.g. 13.5, 15.6 etc... I need that checked if this is a number only int, e.g. 13, 14 ... etc.

if (is_numeric($r_haslo) == false) {
    $wszystko_ok = false;
    $_SESSION['e_haslo'] = "<i class=\"fas fa-user-times\"></i> Podaj tylko cyfry!";
}

Possible duplicate of How to check whether a variable in $_GET Array is an integer? — O.O.Balance
– O.O.Balance, Commented Jun 14, 2018 at 0:16

Community · Accepted Answer · 2020-06-20 09:12:55Z

0

if it has to be an integer and integer only this is how I like to do it.

if (is_numeric($r_haslo) == false || ((int)$r_haslo != $r_haslo)) {
    //is an integer
    $wszystko_ok = false;
    $_SESSION['e_haslo'] = "<i class=\"fas fa-user-times\"></i> Podaj tylko cyfry!";
}

With the updated code above, this now makes sure that $r_haslo is not a number first, and if it is a number, that the number is not an int. So if it's not a number or not an int then it will save the warning to the session.

This way if I send 23 and "23" both are true.
If I send 23 and "23" to is_int() function only 23 will be true.

If you never send string input then is_int() is probably the better way to go.

Update

if (strpos($mystring, ".") || is_numeric($r_haslo) == false || ((int)$r_haslo != $r_haslo)) 
{
    //is an integer
    $wszystko_ok = false;
    $_SESSION['e_haslo'] = "<i class=\"fas fa-user-times\"></i> Podaj tylko cyfry!";
}

The updated code above will also make sure that there is not a '.' in the input.

Note
if the value is being passed as a number, PHP will automatically convert 12.0 and 12. to 12. if the value is being passed as a string, the srtpos() method will catch it.

edited Jun 20, 2020 at 9:12

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answered Jun 13, 2018 at 22:35

thatguy

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2 Comments

FSp1333 Over a year ago

I would like it to be false

FSp1333 Over a year ago

okay, this is working but i need, that if i press: 12.0 or 12. that this still does not return the true. so how do I block the possibility of entering a dot?

Progrock · Accepted Answer · 2018-06-14 09:22:59Z

0

When you say this code accepts, I'll interpret that as you are taking user input by way of a HTTP POST or GET.

The following will only assign and cast to an integer if the posted string contains digits (an unsigned integer within) otherwise it will be assigned null.

<?php
$id = isset($_POST['id']) && ctype_digit($_POST['id'])
    ? (int) $_POST['id']
    : null;

edited Jun 14, 2018 at 9:22

answered Jun 14, 2018 at 0:15

Progrock

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Comments

Joseph_J · Accepted Answer · 2018-06-13 22:32:36Z

-1

You can us is_int() to check.

if (is_int($r_haslo) == false) {
    $wszystko_ok = false;
    $_SESSION['e_haslo'] = "<i class=\"fas fa-user-times\"></i> Podaj tylko cyfry!";
}

answered Jun 13, 2018 at 22:32

Joseph_J

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1 Comment

Barmar Over a year ago

is_int() is false for a string even if it contains the characters of an integer.

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