功能未按预期工作(function isn't working as expected)

 我正在开发一个接受2个参数的函数， $base和$top 
 
 我希望返回$base的功率，该功率将小于$top和exponent。 
 
 我期待的输出是$power=125和$exp=3 。 
 
 我已经设法让$exp正确，但是我的6 $power正在上升，我无法弄清楚为什么它会超过$top 。 
 
 这是我的代码： 
 
<?php
$base = 5;
$top  = 130;

function topPower($base, $top) {

    $exp = 0;
    while($power<$top) {
        $exp++;
        $power = pow($base, $exp);  
    } 

    return array($power, $exp-1);
}

$results = topPower($base, $top);
print_r ($results);
?>

I am working on a function that accepts 2 parameters, $base and $top
 
I am looking to return the power of the $base which would be less than $top and the exponent.
 
The outputs that i am expecting is $power=125 and $exp=3.
 
I've managed to get $exp correct, but my $power is coming up as 625 and I cannot figure out why it is going over $top.
 
Here is my code:
 
<?php
$base = 5;
$top  = 130;

function topPower($base, $top) {

    $exp = 0;
    while($power<$top) {
        $exp++;
        $power = pow($base, $exp);  
    } 

    return array($power, $exp-1);
}

$results = topPower($base, $top);
print_r ($results);
?>

原文：https://stackoverflow.com/questions/20476306