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@ 2024-03-31T21:07:10Z

<?php

$recipients = [
    "kumar",
    "ram@test.com",
    "ravi",
    "rob@example.com"
];

echo implode(
         ', ',
         preg_replace(
             '/^[^@]+$/',
             '$0@test.com',
             $recipients
         )
     );

Output
Performance
VLD
References
Branches

implode: documentation ( source)
preg_replace: documentation ( source)

preferences:dark modelive previewkey bindings

23.59 ms | 405 KiB | 5 Q