<?php

​

    //Create example

    $fromName = "John Doe";

    $toName = "Jane Doe";

    $fromEmail = "john@doe.com";

    $toEmail = "jane@doe.com";

    $body = "Hello,

Message here

On some date John Doe...

Blah

_________________________________________________________________

End

    ";

​

​

​

    //preg_replace

    $patterns = array(

        "/^_{30,}$(?s:.*)/m",

        "/^.*Original Message(?s:.*)/im",

        "/^(?:---.*)?On .* wrote:(?s:.*)/im",

        "/^On .* $fromName(?s:.*)/im",

        "/^On .* $toName(?s:.*)/im",

        "/^.*$toEmail(.*)wrote:(?s:.*)/im",

        "/^.*$fromEmail.* wrote:(?s:.*)/im",

        "/^>.*/ims",

    );

    $message = preg_replace($patterns, '', $body);

​

​

​

    //compare before and after

    echo "===BEFORE:===\n$body\n\n\n===AFTER:===\n$message";

?>