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POP3::is_ok( $cmd = "" )

Source

File: wp-includes/class-pop3.php

function is_ok ($cmd = "") {
        //  Return true or false on +OK or -ERR

        if( empty($cmd) )
            return false;
        else
            return( stripos($cmd, '+OK') !== false );
    }

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Licensed under the GNU GPLv2+ License.
https://developer.wordpress.org/reference/classes/pop3/is_ok