# pow

(PHP 4, PHP 5, PHP 7, PHP 8)

powExponential expression

### Açıklama

pow(mixed `\$num`, mixed `\$exponent`):

Returns `num` raised to the power of `exponent`.

Bilginize:

It is possible to use the ** operator instead.

### Bağımsız Değişkenler

`num`

The base to use

`exponent`

The exponent

### Dönen Değerler

`num` raised to the power of `exponent`. If both arguments are non-negative integers and the result can be represented as an integer, the result will be returned with int type, otherwise it will be returned as a float.

PHP-Extensions may override the behaviour of this operation and make it return an object.

### Örnekler

Örnek 1 Some examples of pow()

`<?phpvar_dump(pow(2, 8)); // int(256)echo pow(-1, 20), PHP_EOL; // 1echo pow(0, 0), PHP_EOL; // 1echo pow(10, -1), PHP_EOL; // 0.1var_dump(pow(new GMP("3"), new GMP("2"))); // object(GMP)echo pow(-1, 5.5); // NAN?>`

### Notlar

Bilginize:

This function will convert all input to a number, even non-scalar values, which could lead to weird results.

### Ayrıca Bakınız

• exp() - Calculates the exponent of e
• sqrt() - Square root
• bcpow() - Keyfi duyarlıklı sayılar için üs alma işlemi yapar
• gmp_pow() - Raise number into power

### User Contributed Notes 6 notes

56
chris at ocportal dot com
12 years ago
`Many notations use "^" as a power operator, but in PHP (and other C-based languages) that is actually the XOR operator. You need to use this 'pow' function, there is no power operator.i.e. 3^2 means "3 XOR 2" not "3 squared".It is particular confusing as when doing Pythagoras theorem in a 'closet points' algorithm using "^" you get results that look vaguely correct but with an error.`
16
raiika
5 years ago
`It is official now that you could use <?php2 ** 3; // 8// instead ofpow(2, 3); // 8?>`
17
gilthansREMOVEME at gmail dot com
17 years ago
`Note that pow(0, 0) equals to 1 although mathematically this is undefined.`
Roman
3 years ago
`If you use negative numbers, you need to use brackets for using with **<?php-1 ** 2; // -1(-1) ** 2; // 1?>`
scott at arciszewski dot me
10 years ago
`As of PHP 5.6.0alpha2, there is now an exponentiation operator. If this is kept in the final release, it may be worth noting here.<?php// These two will be equivalent as of PHP 5.6.0\$x = \$y ** 2;\$x = pow(\$y, 2);?>`
-7
jaxx1rr at gmail dot com
4 years ago
`funny thingnumber_format(pow(2, 1023));gives a long numberbut number_format(pow(2, 1024));gives inf`