Checking if a variable is an integer in PHP

Question

I have the following code

    $page = $_GET['p'];      if($page == "")     {         $page = 1;     }     if(is_int($page) == false)     {         setcookie("error", "Invalid page.", time()+3600);         header("location:somethingwentwrong.php");         die();     }     //else continue with code 

which I am going to use for looking at different "pages" of a database (results 1-10, 11-20, etc). I can't seem to get the is_int() function to work correctly, however. Putting "1" into the url (noobs.php?p=1) gives me the invalid page error, as well as something like "asdf".

Answer 1

Using is_numeric() for checking if a variable is an integer is a bad idea. This function will return TRUE for 3.14 for example. It's not the expected behavior.

To do this correctly, you can use one of these options:

Considering this variables array :

$variables = [     "TEST 0" => 0,     "TEST 1" => 42,     "TEST 2" => 4.2,     "TEST 3" => .42,     "TEST 4" => 42.,     "TEST 5" => "42",     "TEST 6" => "a42",     "TEST 7" => "42a",     "TEST 8" => 0x24,     "TEST 9" => 1337e0 ]; 

The first option (FILTER_VALIDATE_INT way) :

# Check if your variable is an integer if ( filter_var($variable, FILTER_VALIDATE_INT) === false ) {   echo "Your variable is not an integer"; } 

Output :

TEST 0 : 0 (type:integer) is an integer ✔ TEST 1 : 42 (type:integer) is an integer ✔ TEST 2 : 4.2 (type:double) is not an integer ✘ TEST 3 : 0.42 (type:double) is not an integer ✘ TEST 4 : 42 (type:double) is an integer ✔ TEST 5 : 42 (type:string) is an integer ✔ TEST 6 : a42 (type:string) is not an integer ✘ TEST 7 : 42a (type:string) is not an integer ✘ TEST 8 : 36 (type:integer) is an integer ✔ TEST 9 : 1337 (type:double) is an integer ✔ 

The second option (CASTING COMPARISON way) :

# Check if your variable is an integer if ( strval($variable) !== strval(intval($variable)) ) {   echo "Your variable is not an integer"; } 

Output :

TEST 0 : 0 (type:integer) is an integer ✔ TEST 1 : 42 (type:integer) is an integer ✔ TEST 2 : 4.2 (type:double) is not an integer ✘ TEST 3 : 0.42 (type:double) is not an integer ✘ TEST 4 : 42 (type:double) is an integer ✔ TEST 5 : 42 (type:string) is an integer ✔ TEST 6 : a42 (type:string) is not an integer ✘ TEST 7 : 42a (type:string) is not an integer ✘ TEST 8 : 36 (type:integer) is an integer ✔ TEST 9 : 1337 (type:double) is an integer ✔ 

The third option (CTYPE_DIGIT way) :

# Check if your variable is an integer if ( ! ctype_digit(strval($variable)) ) {   echo "Your variable is not an integer"; } 

Output :

TEST 0 : 0 (type:integer) is an integer ✔ TEST 1 : 42 (type:integer) is an integer ✔ TEST 2 : 4.2 (type:double) is not an integer ✘ TEST 3 : 0.42 (type:double) is not an integer ✘ TEST 4 : 42 (type:double) is an integer ✔ TEST 5 : 42 (type:string) is an integer ✔ TEST 6 : a42 (type:string) is not an integer ✘ TEST 7 : 42a (type:string) is not an integer ✘ TEST 8 : 36 (type:integer) is an integer ✔ TEST 9 : 1337 (type:double) is an integer ✔ 

The fourth option (REGEX way) :

# Check if your variable is an integer if ( ! preg_match('/^\d+$/', $variable) ) {   echo "Your variable is not an integer"; } 

Output :

TEST 0 : 0 (type:integer) is an integer ✔ TEST 1 : 42 (type:integer) is an integer ✔ TEST 2 : 4.2 (type:double) is not an integer ✘ TEST 3 : 0.42 (type:double) is not an integer ✘ TEST 4 : 42 (type:double) is an integer ✔ TEST 5 : 42 (type:string) is an integer ✔ TEST 6 : a42 (type:string) is not an integer ✘ TEST 7 : 42a (type:string) is not an integer ✘ TEST 8 : 36 (type:integer) is an integer ✔ TEST 9 : 1337 (type:double) is an integer ✔