File: wp-includes/class-wp-customize-setting.php
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Checks user capabilities and theme supports, and then saves the value of the setting.
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Fires when the WP_Customize_Setting::save() method is called.
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Fetch and sanitize the $_POST value for the setting.
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Sanitize an input.
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Filters a Customize setting value in un-slashed form.
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Save the value of the setting, using the related API.