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wp-admin/includes/class-theme-upgrader.php | Developer.WordPress.org
File: wp-admin/includes/class-theme-upgrader.php
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Turns on maintenance mode before attempting to upgrade the active theme.
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Turns off maintenance mode after upgrading the active theme.
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Deletes the old theme during an upgrade.
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Gets the WP_Theme object for a theme.
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Checks if a child theme is being installed and its parent also needs to be installed.
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Don’t display the activate and preview actions to the user.
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Install a theme package.
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Upgrades a theme.
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Upgrades several themes at once.
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Checks that the package source contains a valid theme.
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classTheme_Upgrader
Core class used for upgrading/installing themes.
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Initializes the upgrade strings.
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Initializes the installation strings.