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Custom Upload Quotas for Individual Sites

Gives chosen sites a bigger (or smaller) upload quota than the network default, without editing each site in Network Admin.

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Code

if ( ! is_multisite() ) {
    return;
}

$wpide_quotas = array( // Blog ID => quota in MB, e.g. 2 => 1000.
);

add_filter( 'get_space_allowed', function ( $space ) use ( $wpide_quotas ) {
    $id = get_current_blog_id();

    return isset( $wpide_quotas[ $id ] ) ? (int) $wpide_quotas[ $id ] : $space;
} );

Notes

Values are in megabytes. Sites not listed keep the network's "Site upload space" setting.

How to add this snippet

  1. Install WPIDE on your WordPress site (it is free) and open Code Snippets.
  2. Use snippet above adds it from the library in one click. Or copy the code into a new snippet with the same code type.
  3. It is added inactive: review the code and settings, then switch it on.

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