Progress on create a conversation way

functions/requests.php

@@ -0,0 +1,56 @@
+<?php
+/**
+ * Requests functions
+ *
+ * @author Pierre HUBERT
+ */
+
+/**
+ * Check $_POST parametres associated to a request
+ *
+ * @param Array $varList The list of variables to check
+ * @return Boolean True or false depending of the success of the operation
+ */
+function check_post_parametres(array $varList){
+
+	//Check each fields
+	foreach($varList as $process){
+
+		//Check variable existence
+		if(!isset($_POST[$process]))
+			return false; //The variable does not exists
+		
+		//Check variable content
+		if($_POST[$process] == "")
+			return false; //The variable is empty
+
+	}
+
+	//If we arrive there, it is a success
+	return true;
+}
+
+/**
+ * Convert a list of user comma-separated to an array
+ *
+ * @param String $list The input list
+ * @return Array The list of user / an empty list in case of errors
+ */
+function users_list_to_array($list) : array{
+	//Split the list into an array
+	$array = explode(",", $list);
+	$usersList = array();
+
+	foreach($array as $process){
+
+		//Check the entry is valid
+		if(floor($process*1) < 1)
+			return array();
+		
+		//Add the entry to the list
+		$usersList[] = floor($process*1);
+	}
+
+	//Return the result
+	return $usersList;
+}