Don't use a variable variable in `wp_widget_rss_form()`. Sidenote: the logic to show hidden fields is bizarre - would result in duplicate fields.
See #27881. Built from https://develop.svn.wordpress.org/trunk@28734 git-svn-id: http://core.svn.wordpress.org/trunk@28548 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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@ -1153,7 +1153,7 @@ function wp_widget_rss_form( $args, $inputs = null ) {
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if ( 'hidden' === $inputs[$input] ) :
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$id = str_replace( '_', '-', $input );
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?>
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<input type="hidden" id="rss-<?php echo $id; ?>-<?php echo $number; ?>" name="widget-rss[<?php echo $number; ?>][<?php echo $input; ?>]" value="<?php echo $$input; ?>" />
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<input type="hidden" id="rss-<?php echo $id; ?>-<?php echo $number; ?>" name="widget-rss[<?php echo $number; ?>][<?php echo $input; ?>]" value="<?php echo $inputs[ $input ]; ?>" />
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<?php
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endif;
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endforeach;
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