如何使用PHP从数组值中减去时间？

Question

我有这个数组。

$val = array(12:10, 4:16, 2:05);

我想从$ val数组中减去14:00 hrs，从每个元素都不会像这样的元素变为负面的方式：

$val = array(0, 2:26, 2:05)

Answer 1

<?php
$input = "14:00";
$val = array("12:10", "4:16", "2:05");

function timeSubtractionFirstTime($actual_time ,$time_to_reduce){
   $actual_time_array = explode(":",$actual_time);
   $time_to_reduce = explode(":",$time_to_reduce);
   $final_result = [];
   if($actual_time_array[1] < $time_to_reduce[1]){
     $actual_time_array[0] = $actual_time_array[0]-1;
     $final_result[] = $actual_time_array[1]+60-$time_to_reduce[1];
   }else{
     $final_result[] = $actual_time_array[1]-$time_to_reduce[1];
   }
    $final_result[] = $actual_time_array[0]-$time_to_reduce[0];

    return implode(":", array_reverse($final_result));
}

$timeToReduceLeft = $input;
foreach ($val as &$value) {
    $diff = timeSubtractionFirstTime($value, $timeToReduceLeft);
    if (strpos($diff, chr(45)) !== false){ //if $value < $timeToReduceLeft
        $timeToReduceLeft = timeSubtractionFirstTime($timeToReduceLeft, $value);
        $value = "00:00";
    }
    else { //if $value >= $timeToReduceLeft
        $value = timeSubtractionFirstTime($value, $timeToReduceLeft);
        $timeToReduceLeft = "00:00";
    }
    
    
    if ($timeToReduceLeft == "00:00"){
        break;
    }

}

echo implode(",", $val);

我获得了从此 post 的功能您的问题的逻辑如下：

我们从输入值提取时间，直到输入值变为零或整个数组元素变为零（通过forloop）。

该解决方案还可以使用大于“ 24:00”的输入或数组元素值。