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wp-admin/includes/class-plugin-upgrader.php | Developer.WordPress.org
File: wp-admin/includes/class-plugin-upgrader.php
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Fires when the upgrader has successfully overwritten a currently installed plugin or theme with an uploaded zip package.
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Turns off maintenance mode after upgrading an active plugin.
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Turns on maintenance mode before attempting to background update an active plugin.
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Upgrades several plugins at once.
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Checks that the source package contains a valid plugin.
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Retrieves the path to the file that contains the plugin info.
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Deactivates a plugin before it is upgraded.
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Deletes the old plugin during an upgrade.
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classPlugin_Upgrader
Core class used for upgrading/installing plugins.
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Initializes the upgrade strings.
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Initializes the installation strings.
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Install a plugin package.
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Upgrades a plugin.