PHP: gettype - Manual

Description

string gettype ( mixed var )

Returns the type of the PHP variable var.

Внимание

Never use gettype() to test for a certain type, since the returned string may be subject to change in a future version. In addition, it is slow too, as it involves string comparison.

Instead, use the is_* functions.

Possibles values for the returned string are:

"boolean" (since PHP 4)
"integer"
"double" (for historical reasons "double" is returned in case of a float, and not simply "float")
"string"
"array"
"object"
"resource" (since PHP 4)
"NULL" (since PHP 4)
"user function" (PHP 3 only, deprecated)
"unknown type"

For PHP 4, you should use function_exists() and method_exists() to replace the prior usage of gettype() on a function.

gettype

gilthansNOSPAM at gmail dot com
11-Sep-2005 01:18


NaN and #IND will return double or float on gettype, while some inexistent values, like division by zero, will return as a boolean FALSE. 0 by the 0th potency returns 1, even though it is mathematically indetermined.



<?php

$number = 5/0;

$number2 = sqrt(-3);

$number3 = pow(0, 0);

$number4 = 0/0;



echo $number."<br />";

echo $number2."<br />";

echo $number3."<br />";

echo $number4."<br />";

echo "<br />";

echo gettype($number)."<br />";

echo gettype($number2)."<br />";

echo gettype($number3)."<br />";

echo gettype($number4);

?>



This will return:



-1.#IND

1



boolean

double

integer

boolean



0

1

1

0

PHP Warning: Division by zero in C\test.php on line 2 PHP Warning: Division by zero in C:\test.php on line 5

matt at appstate
16-Dec-2004 11:10


Here is something that had me stumped with regards to gettype and is_object.

Gettype will report an incomplete object as such, whereas is_object will return FALSE.



if (!is_object($incomplete_obj)) {

   echo 'This variable is not an object, it is a/an ' . gettype($incomplete_obj);

}



Will print:

This variable is not an object, it is a/an object

jose at vocis dot com
14-Sep-2000 09:22


Also returns "NULL" for variables assigned the return of a function that returned no value via "return;". 





<code>





function weird(){


    return;


}


$a=weird();





</code>





isset($a) <> 1


empty($a) <> 1


gettype($a) == NULL





-Jose Batista

ojones at dotclick dot com
31-Aug-2000 10:19


After calling OCIResult to retrieve a NULL result from an Oracle result-set, gettype returns the string 'NULL'.