How to get human friendly format time zone offset (PHP)

Help me to decide this task, please. (PHP, Symfony)

What I have: List of time zone like

"Europe/Riga"
"Europe/Rome"
"Europe/Samara"
"Europe/San_Marino"
"Europe/Sarajevo"

In result I want to see:

 (+00:00) Riga
 (+01:30) Rome
 (+03:00) Samara
 (-01:00) San_Marino
 (+05:00) Sarajevo

What I did:

$timeZoneIdentifierList = DateTimeZone::listIdentifiers();

        $timeZoneUtc = new DateTimeZone('UTC');
        $nowByUtc = new DateTime('now', $timeZoneUtc);

        foreach ($timeZoneIdentifierList as $timeZoneIdentifier) {
            $dateTimezoneItem = new DateTimeZone($timeZoneIdentifier);

            $timeZone = $dateTimezoneItem->getOffset($nowByUtc);
            
            $humanFriendlyOffset = $timeZone / 3600;
        }

And if I dump $humanFriendlyOffset I get only digital value like this: 0, 1, -7, 2, 1.5

Question: Is something prepared method in PHP/Symfony to convert

• 1 -> +01:00,
• -7 -> -07:00,
• 2 -> +02:00,
• 1.5 -> +01:30

May be exist more easy way?

Answer

This solution creates a new DateTime object for each time zone.

$tzArr = ["Europe/Riga",
"Europe/Rome",
"Europe/Samara",
"Europe/San_Marino",
"Europe/Sarajevo",
"UTC"];

foreach($tzArr as $tz){
  $dt = date_create('Now',new DateTimeZone($tz));
  
  $formatTz = $dt->format('(P) e');
  echo $formatTz."<br>n"; 
}

Output:

(+02:00) Europe/Riga
(+01:00) Europe/Rome
(+04:00) Europe/Samara
(+01:00) Europe/San_Marino
(+01:00) Europe/Sarajevo
(+00:00) UTC

With a preg_replace the continent can be hidden and an output can be achieved exactly as desired.

foreach($tzArr as $tz){
  $dt = date_create('Now',new DateTimeZone($tz));

  $loc = preg_replace('~^[a-z]+/~i','', $dt->format('e'));
  $formatTz = $dt->format('(P) ').$loc;
  echo $formatTz."<br>n"; 
}

Output:

(+02:00) Riga
(+01:00) Rome
(+04:00) Samara
(+01:00) San_Marino
(+01:00) Sarajevo
(+00:00) UTC