在数组中查找匹配变量 - Finding Matching Variable In Array

Finding Matching Variable In Array

本文关键字：变量查找数组 | 更新日期: 2023-09-27

我想通过比较两个数组来确定$today是否是已知的非工作日或假期并报告结果。我不知道if和elseif结构中有什么可以比较数组中的变量是否与$today匹配：

<?php
// Date & Time
$timeadjust = '-5 hours';
$today_long = date('l, d F Y', strtotime($timeadjust));
$today = date('m-d', strtotime($timeadjust));
$today_day_name = date('l', strtotime($timeadjust));
// Normal Non-Working Days
$saturday = 'Saturday';
$sunday = 'Sunday';
// 2015 Holidays
$new_years_day = '01-01';
$fourth_of_july = '07-04';
$thanksgiving = '11-26';
$thanksgiving_friday = '11-27';
$christmas_eve = '12-24';
$christmas = '12-25';
$new_years_eve = '12-31';
// Normal Non-Working Day Array
$no_work = array($saturday,$sunday);
// Holiday Array
$holiday = array($new_years_day,$fourth_of_july,$thanksgiving,$thanksgiving_friday,$christmas_eve,$christmas,$new_years_eve);
// Compare Today To Normal Non-Working Day & Holiday Arrays To Determine If Today Is Normal Non-Working Day Or Holiday
if ($today_day_name = $no_work) {$operating = 'CLOSED';}
elseif ($today = $holiday) {$operating = 'CLOSED';}
else {$operating = 'OPEN';}
// Display Result Of Comparison & Report Operating Status
echo '<h3>Today is&nbsp;'.$today_long.'.&nbsp;We are&nbsp;'.$operating.'&nbsp;today!</h3>';
?>

对于您正在执行的操作，您可以使用in_array()来测试该值是否在选定的数组中 -

// Compare Today To Normal Non-Working Day & Holiday Arrays To Determine If Today Is Normal Non-Working Day Or Holiday
if (in_array($today_day_name, $no_work)) {
    $operating = 'CLOSED';
} elseif (in_array($today, $holiday)) {
    $operating = 'CLOSED';
} else {
    $operating = 'OPEN';
}

例

在你的原始代码中，你也在分配而不是测试——

if($foo = $bar) // one equals sign assigns
if($foo == $bar) // two equals signs compares
if($foo === $bar) // three equals signs tests for equivalency, does it match value and type?

因为您正在分配 if 语句将始终计算为 true。