PHP函数调试求助：按规则生成数值序列逻辑错误

Got it, let's get this function working as expected! The issue right now is that when $max > 100, your code skips the 20-to-100 step-by-5 sequence entirely and starts incrementing by 25 right from 20. That's why your output for $max=500 isn't including those smaller denominations.

Here's the corrected code that follows your requirements perfectly:

public function getDenominations($max) {
    $start = 20;
    $output = [];

    // First, handle the 20 to min(max, 100) range with step 5
    $upperStep5 = min($max, 100);
    for($i = $start; $i <= $upperStep5; $i += 5) {
        array_push($output, $i);
    }

    // If max is over 100, add denominations from 125 onward with step 25
    if($max > 100) {
        // Start at 125 since 100 is already included in the previous loop
        for($i = 125; $i <= $max; $i += 25) {
            array_push($output, $i);
        }
    }

    return $output;
}

How this works: #

• Unified step-5 logic: Instead of splitting the step-5 loop into two separate cases, we use min($max, 100) to cap the upper limit. This way, if $max <=100, we just go up to $max; if it's over 100, we go up to 100. No duplicate code needed!
• Step-25 extension: When $max >100, we start the step-25 loop at 125 (since 100 is already in the array from the step-5 loop) and keep going until we hit $max.

Testing this with $max=500 will give you the full sequence: 20,25,...,100,125,150,...,500 — exactly what you're expecting.

内容的提问来源于stack exchange，提问作者SBB