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Is there a function that can check if an enqueued script has a call to wp_localize_script attached to it?

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Try this:

function is_localized($tag) {

    global $wp_scripts;

    $data = $wp_scripts->get_data( $tag, 'data' );

    return ! empty( $data );
}
  • As I'm facing a related question right now: There's no l10n part inside extra (anymore?). It's array( 'data', 'group' );. – kaiser Aug 2 '12 at 2:11
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    @kaiser this stuff keeps changing, updated code – Rarst Aug 2 '12 at 19:07

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