使用RegEx交换两个变量

Question

So here is my code, and then I will explain what I am having trouble with:

foreach($people as $person){
    // counter for each person
    $counter = 0;
    // get variables for each item
    list($fullName,$phoneNumber,$address,$birthday,$salary) = explode(':', $person);
    // get variables for first and last name
    list($firstName, $lastName) = explode(" ", $fullName);
    // get variables for phone numbers
    list($areaCode, $middleDigits, $lastDigits) = explode('-',$phoneNumber);
    //get variables for address
    list($street,$city,$statezip) = explode(", ", $address);
    // get variables for state and zip separately
    list($state,$zipCode) = explode(" ", $statezip);


    // print file with the first and last names reversed
    $tempFName = $firstName;
    $tempLName = $lastName;
    echo $newPerson = (preg_replace("/($tempLName)($tempFName)/", $firstName, $lastName, $person))."<br/>";

    $counter++;
}

What I want to do, is print the original $person, but with the $firstName and $lastName 's reversed. I'm able to replace the values and then print out each variable, but then it wouldn't have the same format as $person originally did unless I formatted each line. I was wondering if there was a way to do it without formatting each output to look identical to the original $person variable.

Thanks!

Answer 1

It looks as if Firstname and Lastname are always separated by whitespace and preceed the first colon character... if this is correct the above may be overkill. Try this:

echo $newPerson = (preg_replace("/(.*?)\s+(.*?)\:/", '$2,$1:', $person))."<br/>";