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<?php
function get_post_custom_keys( $post_id = 0 ) {
    $custom = get_post_custom( $post_id );

    if ( !is_array($custom) )
        return;

    if ( $keys = array_keys($custom) )
        return $keys;
}
?>

• Function Reference/get post custom keys « WordPress Codex
  Description. Returns an array containing the keys of all custom fields of a particular post or page. See also get_post_custom() and get_post_custom_values() ...
  codex.wordpress.org
• get_post_custom_keys($post->ID); - WordPress
  [resolved] get_post_custom_keys($post->ID); (5 posts) ... to proof if there's a custom-field-key is set. get_post_custom_keys($post->ID) returns an array, so far.
  wordpress.org
• WordPress › Support » Tags — get_post_custom_keys()
  (forgot?) Register · WordPress › Support » get_post_custom_keys() ... [resolved] get_post_custom_keys($post->ID);, 5, Maiskolben, 2 years. [resolved] WP adds ...
  wordpress.org
• 関数リファレンス/get post custom keys - WordPress Codex 日本語版
  2010年4月20日 ... <?php get_post_custom_keys($post_id); ?> ... <?php $custom_field_keys = get_post_custom_keys(); foreach ( $custom_field_keys as $key ...
  wpdocs.sourceforge.jp

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• Maiskolben on "get_post_custom_keys($post->ID);"
• esmi on "get_post_custom_keys($post->ID);"
• Maiskolben on "get_post_custom_keys($post->ID);"
• esmi on "get_post_custom_keys($post->ID);"
• Maiskolben on "get_post_custom_keys($post->ID);"
• carolineh on "WP adds empty <ul></ul> even when there is no custom field data"
• SueBlack on "WP adds empty <ul></ul> even when there is no custom field data"
• SueBlack on "WP adds empty <ul></ul> even when there is no custom field data"

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