Write last 6 PHP Programs for File

<?php

    $email="example@gmail.com";
    echo "Domain: ". strstr($email,"@");
    echo "<br>Username :". strstr($email,"@",true);
?>
   
NEXT PROGRAM : 
<?php
    
    $mobile ="+91723456789";
    echo "<br>C Code :". substr($mobile,0,3);
    echo "<br>M No :". substr($mobile,3);
?>