fix each to foreach on php7.2

Author: hetao

plugins/mail/class.phpmailer.php

@@ -1390,7 +1390,7 @@ public function EncodeQP( $input = '', $line_max = 76, $space_conv = false ) {
     $eol = "\r\n";
     $escape = '=';
     $output = '';
-    while( list(, $line) = each($lines) ) {
+	foreach($lines as $line){
       $linlen = strlen($line);
       $newline = '';
       for($i = 0; $i < $linlen; $i++) {

plugins/mail/class.smtp.php

@@ -388,7 +388,7 @@ public function Data($msg_data) {
 
     $max_line_length = 998; // used below; set here for ease in change
 
-    while(list(,$line) = @each($lines)) {
+	foreach($lines as $line){
       $lines_out = null;
       if($line == "" && $in_headers) {
         $in_headers = false;
@@ -418,7 +418,7 @@ public function Data($msg_data) {
       $lines_out[] = $line;
 
       // now send the lines to the server
-      while(list(,$line_out) = @each($lines_out)) {
+	  foreach($lines_out as $line_out){
         if(strlen($line_out) > 0)
         {
           if(substr($line_out, 0, 1) == ".") {
@@ -502,7 +502,7 @@ public function Expand($name) {
 
     // parse the reply and place in our array to return to user
     $entries = explode($this->CRLF,$rply);
-    while(list(,$l) = @each($entries)) {
+	foreach($entries as $l){
       $list[] = substr($l,4);
     }