gettype()

(PHP 4, PHP 5, PHP 7)

获取变量的类型

描述

返回 PHP 变量的类型$var.

不要使用gettype()来测试某种类型，因为其返回的字符串在未来的版本中可能需要改变。此外，由于包含了字符串的比较，它的运行也是较慢的。

使用is_*函数代替。

返回的字符串的可能值为：

• “boolean”（从 PHP 4 起）
• “integer”
• “double”（由于历史原因，如果是float则返回“double”，而不是“float”）
• “string”
• “array”
• “object”
• “resource”（从 PHP 4 起）
• “NULL”（从 PHP 4 起）
• “user function”（只用于 PHP 3，现已停用）
• “unknown type”

对于 PHP 4，你应该使用function_exists()和method_exists()取代先前将gettype()作用于函数的用法。

参见settype()、is_array()、is_bool()、is_float()、is_integer()、is_null()、is_numeric()、is_object()、is_resource()、is_scalar()和is_string()。

Result from this post http://php.net/manual/en/function.gettype.php#56662 for new PHP 7.2.10:

This will return:
INF
NAN
1
NAN
double
double
integer
double

After some testing I found a bug in my function "myGetType":
The check for "is_callable" was done before "is_string", so that something like  would output: "function reference" instead of "string"
"is_callable" and "is_string" can't be checked together in this method, so I've removed the check for is_callable because it's a very rare usage case and if it's a valid string the check for is_callable never executes because is_string would be reached first (or vice-versa).
So here is the new function without "is_callable"-Check: 

@langpavel at phpskelet dot org
Doesn't the gettype return the string already? Using get_class seems to be the only "useful" part of that solution. All that can be reduced to somewhere half in terms of the amount of code.

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.

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

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.

Will print:
This variable is not an object, it is a/an object

I did some benchmarking and your method here is alot slower then using the actual gettype(); (Using php 5.3.4)

This function returns string representation of type. This is generalization of get_class(). I try to order is_* tests by density of occurence, but is bad idea to use result of this call in conditions for performance reasons, usefull and better than gettype for debugging messages.
Note, that last line should not be never executed.
Also has no sense to make input parameter optional. 

This is my work around for the gettype warning. Hope some find it useful.

[EDITOR thiago NOTE: Code has been updated by PPKu-N0-SPAM-schy at mediasoft-berlin dot de]

In some rare cases a class instance object returns false when an object but gettype() returns "object". 

I wrote my own gettype function by just using the default is_? functions, but it took twice as long as gettype... So I decided to use gettype with a twist.
Taking the warnings about gettype to heart, and depending on your custom needs, it's worthwhile to dynamically test the gettype result with a known variable, and link the result to a predefined result. Like so:

You won't need to worry about changes in gettype's return strings in future versions.
If the result evaluates to false then you know the variable tested is some "other" type.
I also find these useful 

Hi there,
this fastest solution I found to identify a variable type without using gettype function:

Maybe someone has a more elegant solution to check for object and resource types...
The complete script - including several identify- and timing functions follow:
#!/usr/bin/php

My console output - try the script several times!:
$ ./gettype.php
start@ 2015-01-10 01:10:37
$var = 100 - gettype($var) = integer
typeof_if_query($var) = int
duration: 0.0000500679
typeof_gettype($var) = integer
duration: 0.0000309944
typeof_trinary($var) = int
duration: 0.0000240803

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