created plugin custer, and removed shortcodes change_id and user_infos from cipf plugin

plugins/custer/format_user_infos.php

@@ -0,0 +1,87 @@
+<?php
+namespace CUSTER;
+
+/*
+* it means someone outside wp is accessing the file, in this case kill it.
+*/
+if (!defined('ABSPATH')) {
+	die('You can not access this file!');
+}
+
+
+
+
+function format_user_info($query, &$current_user, $user_id) {
+	$output_date_format = Custer::USER_INFO_DATE_FORMAT;
+
+	$is_acf = false;
+
+
+	/*
+	* check if it's an acf field, and a date
+	* second method : check what get_field_object() returns
+	*
+	*/
+	$acf_id = 'user_'.$user_id;
+	$acf_object = get_field_object($query, $acf_id);
+	if ($acf_object !== false)
+		$is_acf = true;
+
+
+	/*
+	* if is acf, use the acf return format
+	* otherwise, use the default wordpress value
+	*
+	*/
+	if ($is_acf)
+		$output = get_field($query, $acf_id);
+	else
+		$output = $current_user->$query;
+
+
+
+	/*
+	* try to extract a string
+	*
+	*/
+	while (is_array($output) && count($output) === 1)
+		$output = reset($output);
+
+
+
+	/*
+	* if is not acf
+	* check if is a date
+	* and format it
+	* to create a DateTime from a time stamp : https://stackoverflow.com/a/12039058/9497573
+	*
+	*/
+	if (!$is_acf) {
+		$timestamp = false;
+		if (is_string($output)) {
+			$timestamp = strtotime($output);
+		}
+		if ($timestamp !== false) {
+			$date = new DateTime('@' . $timestamp);
+			$output = $date->format($output_date_format);
+		}
+	}
+
+
+
+	/*
+	* return the result
+	*
+	*/
+	if (is_array($output) && count($output) === 0)
+		$output = '';
+	if (!is_string($output))
+		$output = json_encode($output, JSON_UNESCAPED_SLASHES);
+	return esc_html($output);
+}
+
+
+
+
+
+?>