NEW Add function isValidMXRecord

htdocs/core/lib/functions.lib.php

@@ -2782,6 +2782,35 @@ function isValidEmail($address, $acceptsupervisorkey=0)
 	return false;
 }
 
+/**
+ *	Return if the domain name has a valid MX record.
+ *  WARNING: This need function idn_to_ascii, checkdnsrr and getmxrr
+ *
+ *	@param	    string		$domain	    			Domain name (Ex: "yahoo.com", "yhaoo.com", "dolibarr.fr")
+ *	@return     int     							-1 if error (function not available), 0=Not valid, 1=Valid
+ */
+function isValidMXRecord($domain)
+{
+	if (function_exists('idn_to_ascii') && function_exists('checkdnsrr'))
+	{
+		if (! checkdnsrr(idn_to_ascii($domain), 'MX'))
+		{
+			return 0;
+		}
+		if (function_exists('getmxrr'))
+		{
+			$mxhosts=array();
+			$weight=array();
+			getmxrr(idn_to_ascii($domain), $mxhosts, $weight);
+			if (count($mxhosts) > 1) return 1;
+			if (count($mxhosts) == 1 && ! empty($mxhosts[0])) return 1;
+
+			return 0;
+		}
+	}
+	return -1;
+}
+
 /**
  *  Return true if phone number syntax is ok
  *  TODO Decide what to do with this

test/phpunit/FunctionsLibTest.php

@@ -122,6 +122,31 @@ class FunctionsLibTest extends PHPUnit_Framework_TestCase
 
 
 
+    /**
+     * testIsValidMXRecord
+     *
+     * @return void
+     */
+    public function testIsValidMXRecord()
+    {
+    	// Nb of line is same than entry text
+
+    	$input="yahoo.com";
+    	$result=isValidMXRecord($input);
+    	print __METHOD__." result=".$result."\n";
+    	$this->assertEquals(1, $result);
+
+    	$input="yhaoo.com";
+    	$result=isValidMXRecord($input);
+    	print __METHOD__." result=".$result."\n";
+    	$this->assertEquals(0, $result);
+
+    	$input="dolibarr.fr";
+    	$result=isValidMXRecord($input);
+    	print __METHOD__." result=".$result."\n";
+    	$this->assertEquals(0, $result);
+    }
+
     /**
      * testDolGetFirstLineOfText
      *