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PHP切换条件语句更好的方法

conditional-operator switch-statement optimization php

Bryce · 技术社区 · 7 年前

优化此代码的最佳方法是什么?我知道if和else语句会更快,但我想要简洁明了的语句。有什么想法吗?

switch ($data['months']) {
case ($data['months'] >= 400):
    $data['months'] = 400;
    break;
case ($data['months'] >= 360):
    $data['months'] = 360;
    break;
case ($data['months'] >= 60):
    $data['months'] = 60;
    break;
case ($data['months'] >= 48):
    $data['months'] = 48;
    break;
case ($data['months'] >= 36):
    $data['months'] = 36;
    break;
case ($data['months'] >= 24):
    $data['months'] = 24;
    break;
case ($data['months'] >= 12):
    $data['months'] = 12;
    break;
case ($data['months'] >= 9):
    $data['months'] = 9;
    break;
case ($data['months'] >= 6):
    $data['months'] = 6;
    break;
case ($data['months'] >= 3):
    $data['months'] = 3;
    break;
case ($data['months'] >= 1):
    $data['months'] = 1;
    break;
default:
    $data['months'] = 12;
}

3 回复 | 直到 7 年前

Chin Leung 7 年前

我想你可以用 foreach 具有一系列断点。

$breakpoints = array(400, 360, 60, 48, 36, 24, 12, 9, 6, 3, 1);

// Loop through each breakpoints
foreach($breakpoints as $breakpoint){

    // Proceed to next breakpoint
    if($data['months'] < $breakpoint)
        continue;

    // No need to loop through the rest of the array
    $data['months'] = $breakpoint;
    break;

}

// Handle the cases where $data['month'] is less than 1
if($data['months'] < 1)
    $data['months'] = 12;

使现代化

$data['months'] 在循环之前小于1:

if($data['months'] < 1)
    $data['months'] = 12;
else{

    $breakpoints = array(400, 360, 60, 48, 36, 24, 12, 9, 6, 3, 1);

    // Loop through each breakpoints
    foreach($breakpoints as $breakpoint){

        // Proceed to next breakpoint
        if($data['months'] < $breakpoint)
            continue;

        // No need to loop through the rest of the array
        $data['months'] = $breakpoint;
        break;

    }

}

ceejayoz 7 年前

$breakpoints = [1, 3, 6, 9, 12, 24, 36, 48, 60, 360, 400];

foreach($breakpoints as $breakpoint) {
    if($data['months'] >= $breakpoint) {
        $value = $breakpoint;
    }
}

if(!isset($value)) { $value = 12; }

Bryce 7 年前

以下是我最后得到的结果。

$breakpoints = [400, 360, 240, 120, 60, 48, 36, 24, 12, 9, 6, 3, 1, null];
foreach($breakpoints as $breakpoint){
    if($data['months'] >= $breakpoint) {
        $data['months'] = $breakpoint ? $breakpoint : 12;
        break;
    }
}

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