PHP正则表达式输出转换

Question

我想将 12h 34m 45s 这样的输出转换为 12:34:45 ，

如果其中一个返回为空，则应该可以忽略它。 因此，34m 45s 应该是 00:34:45，当然，个位数应该是可能的，例如 1h 4m 1s，以及个位数和两位数的组合，例如 12h 4m 12s 等等。

有人可以帮忙吗？

这是实际的代码

$van = $_POST['gespreksduur_van']; $tot = $_POST['gespreksduur_tot']; $regex = '/(\d\d?h ?)?(\d\d?m ?)?(\d\d?s)?/';

        if(preg_match($regex, $van, $match) AND preg_match($regex, $tot, $matches))
        {
            for ($n = 1; $n <= 3; ++$n) { if (!array_key_exists($n, $match)) $match[$n] = 0; }
            for ($i = 1; $i <= 3; ++$i) { if (!array_key_exists($i, $matches)) $matches[$i] = 0; }

            $van = printf("%02d:%02d:%02d", $matches[1], $matches[2], $matches[3]);
            $tot = printf("%02d:%02d:%02d", $match[1], $match[2], $match[3]);

            print($van);
            print($tot);

            $data['gespreksduurvan'] = htmlspecialchars($van);
            $data['gespreksduurtot'] = htmlspecialchars($tot);

            $smarty->assign('gsv',$data['gespreksduurvan']);
            $smarty->assign('gst',$data['gespreksduurtot']);
        }

Answer 1

您可以使用正则表达式提取组件，然后使用 printf() 按照您喜欢的方式格式化组件：

$time = "1h 45m";
preg_match("/(\d\d?h ?)?(\d\d?m ?)?(\d\d?s)?/", $time, $matches);
for ($i = 1; $i <= 3; ++$i) { if (!array_key_exists($i, $matches)) $matches[$i] = 0; }
printf("%02d:%02d:%02d", $matches[1], $matches[2], $matches[3]);

正则表达式允许可选组件。 for 循环只是用默认值零填充任何丢失的键（以防止秒或分钟/秒都丢失时出现未定义的键错误）。 printf 总是打印所有带有两个零的组件。

Answer 2

如果你想使用正则表达式，你可以使用 preg_replace_callback

    <?php


function callback($matches)
{   
    var_dump($matches);
    if ($matches[2] == "") $matches[2] = "00";
    if ($matches[4] == "") $matches[4] = "00";
    if ($matches[6] == "") $matches[6] = "00";
    return $matches[2] . ":" . $matches[4] . ":" . $matches[6];
}   

$str = "12h 34m 45s";
$str = preg_replace_callback("`(([0-2]?[0-9])h )?(([0-5]?[0-9])m )?(([0-5]?[0-9])s)?`", "callback", $str, 1); 

echo $str;

Answer 3

这是无需正则表达式即可执行此操作的方法

// function for your purpose
function to_time($str){
    $time_arr = explode(' ', $str);
    $time_h = '00';
    $time_m = '00';
    $time_s = '00';
    foreach($time_arr as $v){
        switch(substr($v, -1)){
            case 'h': $time_h = intval($v); break;
            case 'm': $time_m = intval($v); break;
            case 's': $time_s = intval($v); break;
        }
    }
    return $time_h . ':' . $time_m . ':' . $time_s;
}

//test array
$time[] = '1h 45s';
$time[] = '12h 35m 45s';
$time[] = '1m 45s';

// output
foreach($time as $t)
    var_dump(to_time($t));

此输出

string '1:00:45' (length=7)
string '12:35:45' (length=8)
string '00:1:45' (length=7)

Answer 4

$string = "12h 34m 45s";
$string = str_replace(array("h","m","s"), array(":",":",""), str_replace(" ", "", $string));

echo $string;

像这样的东西吗？