A strange problem in the phalcon framework.

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phalcon70$config:

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var_dump($config["mail_user"]);

but the error mail_user subscript does not exist, may I ask why? Php7.2 version

Phalcon php
Mar.22,2021

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this kind of error.

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MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b3c11d-4086f.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b3c11d-4086f.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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