The mailbox for receiving letters has exploded, and I don’t want all the letters. Use PHP to clear the inbox.
The following is the sample program I copied, with minor adjustments.

<?php
$imap_server="{www.hibox.hinet.net:993/imap/ssl}INBOX";

$mbox = imap_open($imap_server, "mailbox account", "password")
    or die("Can't connect: " .imap_last_error());

$check = imap_mailboxmsginfo($mbox);
echo "Messages before delete: " . $check->Nmsgs . "<br />\n";

//mark delete
imap_delete($mbox, "1:$check->Nmsgs");

$check = imap_mailboxmsginfo($mbox);
echo "Messages after delete: " . $check->Nmsgs . "<br />\n";

imap_expunge($mbox);

$check = imap_mailboxmsginfo($mbox);
echo "Messages after expunge: " . $check->Nmsgs . "<br />\n";

imap_close($mbox);

After execution, it will be cleaned up completely: p

But PHP, PHP does not have imap expansion, I use docker to easily expand php with imap.
I use D-Laravel's Dockerfile, make up the relevant packages, and rebuild the dockerfile.
1. Join the kit:

libc-client-dev libkrb5-dev \

2. Add config 

RUN docker-php-ext-configure imap --with-kerberos --with-imap-ssl

3. Add imap.

RUN docker-php-ext-install -j$(nproc) pdo_mysql mysqli ldap pgsql pdo_pgsql gettext sockets imap ctype xml zip pcntl bcmath intl gd \

The differences displayed by git version control are attached below.