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(PHP 4, PHP 5)

is_int — Find whether the type of a variable is integer

bool is_int( $var )

Parameters

$var

The variable being evaluated.

Note:
To test if a variable is a number or a numeric string (such as form input, which is always a string), you must use is_numeric().

Returns TRUE if var is an integer, FALSE otherwise.

&lt;?<a title="See also PHP - Doing Recursion in Anonymous Functions / Closures" href="http://www.whileifblog.com/2012/03/27/php-doing-recursion-in-anonymous-functions-closures/">php</a>
if (is_int(23)) {
    echo &quot;is integer\n&quot;;
} else {
    echo &quot;is not an integer\n&quot;;
}
var_dump(is_int(23));
var_dump(is_int(&quot;23&quot;));
var_dump(is_int(23.5));
var_dump(is_int(true));
?&gt;

The above example will output:

is integer
bool(true)
bool(false)
bool(false)
bool(false)

See Also:

is_float() – Finds whether the type of a variable is float
is_bool() – Finds out whether a variable is a boolean
is_float() – Finds whether the type of a variable is float
is_numeric() – Finds whether a variable is a number or a numeric string
is_string() – Find whether the type of a variable is string
is_array() – Finds whether a variable is an array
is_object() – Finds whether a variable is an object

To see more:
http://php.net/manual/en/function.is-int.php