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# pow

(PHP 3 <= 3.0.18, PHP 4 >= 4.0.0)

pow -- Exponential expression

## Description

``number pow` (number base, number exp)`

Returns `base` raised to the power of `exp`. If possible, this function will return an integer.

If the power cannot be computed, a warning will be issued, and pow() will return `FALSE`.

Example 1. Some examples of pow()
    <?php

    var_dump( pow(2,8) ); // int(256)
    echo pow(-1,20); // 1
    echo pow(0, 0); // 1

    echo pow(-1, 5.5); // error

    ?>

Warning
In PHP 4.0.6 and earlier pow() always returned a float, and did not issue warnings.

See also exp().

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