New and updated in 6.0.0
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functionapply_filters()
Calls the callback functions that have been added to a filter hook.
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Saves current in-memory image to file.
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Filters attachment post data before it is updated in or added to the database.
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functionwp_get_attachment_metadata()
Retrieves attachment metadata for attachment ID.
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Filters slashed post data just before it is inserted into the database.
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functionwp_update_network_user_counts()
Updates the network-wide user count.
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functionget_user_count()
Returns the number of active users in your installation.