is_integer

Definition and usage

is_integer() function checks whether the variable is an integer type.

This function is an alias for is_int() .

Example

Check whether the variable is an integer type:

 <?php
$a = 32 ;
echo "a is " . is_integer ( $a ) . "<br>" ;

$b = 0 ;
echo "b is " . is_integer ( $b ) . "<br>" ;

$c = 32.5 ;
echo "c is " . is_integer ( $c ) . "<br>" ;

$d = "32" ;
echo "d is " . is_integer ( $d ) . "<br>" ;

$e = true ;
echo "e is " . is_integer ( $e ) . "<br>" ;

$f = "null" ;
echo "f is " . is_integer ( $f ) . "<br>" ;
?>

Try it yourself

Example explanation:

In PHP, neither the boolean value true nor the string "32" is an integer type, even if the string contains numbers. So, checks for $d and $e will return FALSE . Similarly, $f is a string, and although its content is "null" , it is not an integer type either, so the check will return FALSE . Floating point numbers such as $c are obviously not integers, so is_int($c) will also return FALSE .

grammar

 is_integer ( variable ) ;