Form input in php being integer

Question

I currently have a form containing an input:

<input type="text" name="score" id="score" value="" />

Criteria: I need the value in this input to be below 40 and a positive integer or zero.

Having read up on php.net about is_int() and is_numeric(). It advises using is_numeric() with form fields as these are always numeric strings.

I want to check if the value meets the above criteria but don't follow how I would do this in the above situation.

<?php
$score = $_POST['score'];
if(is_numeric($score) && $score <= 40){
    // Do good stuff
} else {
  // Don't do good stuff
} ?>

My issue with the above is that floats would pass this test and without using something like (int) $score I can't use is_int() which then negates the is_numeric check.

Am I missing something here?

I don't want to change the input they gave so if they gave me 32.5 then I want to give that back it as the same value in the error — timothystringer
– timothystringer, Commented Jun 10, 2014 at 14:04
@timothystringer Then why do you need to validate if it's an integer more over whether it was a string,float,hex etc? — Daryl Gill
– Daryl Gill, Commented Jun 10, 2014 at 14:06
@DarylGill because it's a test result which only gets whole number scores so I need to make sure that's all I'm accepting — timothystringer
– timothystringer, Commented Jun 10, 2014 at 14:09

Community · Accepted Answer · 2023-11-14 22:27:54Z

0

Use ctype_digit() to make sure the string consists only of numbers, and therefore is an integer - technically, this returns true also with very large numbers that are beyond int's scope. Note that this method will not recognize negative numbers.

edited Nov 14, 2023 at 22:27

CommunityBot

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answered Jun 10, 2014 at 14:04

Anima-t3d

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1 Comment

timothystringer Over a year ago

Thanks this looks like it may be what I need

Qarib Haider · Accepted Answer · 2014-06-10 14:10:54Z

0

<?php
$score = $_POST['score'];
if(ctype_digit($score) && $score <= 40){
    // Do good stuff
} else {
  // Don't do good stuff
} 
?>

answered Jun 10, 2014 at 14:10

Qarib Haider

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