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<?php
function add_post_meta($post_id, $meta_key, $meta_value, $unique = false) {
    // make sure meta is added to the post, not a revision
    if ( $the_post = wp_is_post_revision($post_id) )
        $post_id = $the_post;

    return add_metadata('post', $post_id, $meta_key, $meta_value, $unique);
}
?>

• Function Reference/add post meta « WordPress Codex
  add_post_meta adds a custom (meta) field to the specified post, page or any other post type. If the $unique parameter is set to true and the specified meta key ...
  codex.wordpress.org
• WordPress › Support » add_post_meta One Key with Multiple Values
  What I'm trying to accomplish: I'm trying to use one custom field to add multiple values to the same Meta Key. However, for each time that I submit a value, I get a ...
  wordpress.org
• Using add_post_meta with repeater field - Plugin Support
  P.S. For those who don't know, add_post_meta works great for submitting fields from the front end. All it needs is a field meta_key and your new value, where the ...
  www.advancedcustomfields.com
• Why is add_post_meta creating duplicate entries - Stack Overflow
  Try with this: if ($post->post_type=="post") { if($linkLabel != "" AND $linkText != ""): $newLink = ($linkUrl != "") ? "$linkLabel: <a href='$linkUrl' ...
  stackoverflow.com

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