在PHP中有没有办法确定第一次在while循环中使用值？

I have a while loop where I am returning departments. I want to be able to determine if it is the first time a department is returned. The code is as follows:

$myArray = array('Finance', 'Marketing', 'Customer Service', 'Marketing', 'Marketing', 'IT', 'Finance', 'IT');
while(list ($key, $val) = each ($myArray))
{
    echo $val . "<br />";
}

The above code outputs the below:

Finance

Marketing

Customer Service

Marketing

Marketing

IT

Finance

IT

Is there a way where I can have it output the following?:

Finance(first)

Marketing(first)

Customer Service(first)

Marketing

Marketing

IT(first)

Finance

IT

I think you will have to keep track of used values manually:

<?php
$used = [];

foreach ($myArray as $department) {
    if (isset($used[$department])) {
        // The key exists, it means it's been used already
        echo $department . '<br />';
    } else {
        // The key doesn't exist; we're using it for the first time
        echo $department . ' (first)<br />';
        // Add the key with a true value
        $used[$department] = true;
    }
}

You could do something like this:

$varList[0]['value'] = 'Finance';
$varList[1]['value'] = 'Marketing';
$varList[2]['value'] = 'Customer Service';


for ($i=0;$i<count($varList);$i++) {
    if ($varList[$i]['lastUsed'] == '') {
        $varList[$i]['lastUsed'] = $now;

        echo "{$varList[$i]['value']} (first time being used)";
    } else {
        echo "{$varList[$i]['value']} was last used {$varList[$i]['lastUsed']}";
    }
}

Using a whileloop and check within the loop that will be made every_single_iteration using the following:-

$myArray = array('Finance', 'Marketing', 'Customer Service', 'Marketing', 'Marketing', 'IT', 'Finance', 'IT');
$numItems = count($myArray);
$i=0;
$firstitem=$myArray[0];
$i++;
while($i<$numItems-1){
    $some_item=$myArray[$i];
    $i++;
}
$last_item=$myArray[$i];
$i++;

or

$myArray = array('Finance', 'Marketing', 'Customer Service', 'Marketing', 'Marketing', 'IT', 'Finance', 'IT');
$keys = array_keys($myArray);
$numItems = count($keys);
$i=0;
$firstItem=$myArray[$keys[0]];
# Special handling of the first item goes here
$i++;
while($i<$numItems-1){
    $item=$myArray[$keys[$i]];
    # Handling of regular items
    $i++;
}
$lastItem=$myArray[$keys[$i]];
# Special handling of the last item goes here
$i++;

try this: (short and sweet)

<?php

    $myArray = array('Finance', 'Marketing', 'Customer Service', 'Marketing',
'Marketing', 'IT', 'Finance', 'IT');
    while(list ($key, $val) = each ($myArray))
    {
        echo $val .(isset($t[$val]) ? '' : $t[$val] = '(first)').'<br/>';
    }

So, all you need to do is to add .(isset($t[$val]) ? '' : $t[$val] = '(first)'). with your echo within your existing code.

I you want it to be with a while loop, I guess you could try something like this

$myArray = array('Finance', 'Marketing', 'Customer Service', 'Marketing', 'Marketing', 'IT', 'Finance', 'IT');
$used = [];
$numItems = count($myArray);
$i=0;
while($i<$numItems){
    if (isset($used[$department])) {
        echo $department;
    } else {
        echo $department . ' (first)';
        $used[$department] = true;
    }
    $i++;
}

Personally I would use a foreach like @Parziphal suggested