Using the PHP substr () function will remove the first letter from the string. See the example below to remove the first letter from the string.

<?php
    $str = "Rathorji Tutorial";
    $str = substr($str, 1);
    echo $str;
 ?>

output: 

 athorji Tutorial



Method 2: here is another approach to remove the first letter from the string use preg_replace() PHP function.

 <?php
        $str = "Rathorji Tutorial";
        $str = preg_replace('/^./', '', $str);;
        echo $str;
    ?>