Error Undefined Class Constant

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Magento: Fatal error: Undefined class constant 'CACHE_TAG'
PHP : Undefined class constant 'MYSQL_ATTR_INIT_COMMAND' with pdo
@tipstech84 Undefined constant
Linux Drush install error: Undefined class constant 'MYSQL_ATTR_SSL_CA' in...
Magento: Fatal error: Undefined class constant 'CHECK_USE_CHECKOUT' in
Fatal error: Undefined class constant 'DEFAULT_SCONFIG_FILENAME' public_html/Maged/Connect.php...
Fixed Undefined class constant 'HEADER_CLIENT_IP' Issue | Laravel Updating | #HEADER_CLIENT_IP
Magento: Fatal error: Undefined class constant 'ENTITY'
Magento: Fatal error: Undefined class constant 'TYPE_TEXT' error after upgrading - magento

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Last Updated: June 10, 2026

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