email - fopen multiple files to send mail with mail() php -

i have problems send mail multiple files mail() php. until now, send first file, need please. give code:

html:

<form action="colabora.php" method="post" enctype="multipart/form-data"> 

[...]

<div id="adjuntos"> <input type="file" name="archivos[]" class="form-control"/> </div> 

[...]

php:

[...]

if (isset ($_files["archivos"])) {   $tot = count($_files["archivos"]["name"]);   ($i = 0; $i < $tot; $i++){     $_name=$_files["archivos"]["name"][$i];     $_type=$_files["archivos"]["type"][$i];     $_size=$_files["archivos"]["size"][$i];     $_temp=$_files["archivos"]["tmp_name"][$i];       //files exists     if(strcmp($_name, "")){       $fp = fopen($_temp, "rb");       $file = fread($fp, $_size);       $file = chunk_split(base64_encode($file));      }      // files headers      $headers .= "content-type:application/octet-stream ";     $headers .= "name=\"".$_name."\"r\n";     $headers .= "content-transfer-encoding: base64\r\n";     $headers .= "content-disposition: attachment; ";     $headers .= "filename=\"".$_name."\"\r\n\n";     $headers .= "".$file."\r\n";     $headers .= "--".$num."--";   } } 

[...]

mail($para, $asunto, $body, $headers)

i've noted have lost boundary before each attachment.

// files headers  $headers .= "--".$num."\r\n";  // boundary $headers .= "content-type:application/octet-stream "; $headers .= "name=\"".$_name."\"r\n"; $headers .= "content-transfer-encoding: base64\r\n"; $headers .= "content-disposition: attachment; "; $headers .= "filename=\"".$_name."\"\r\n\n"; $headers .= $file."\r\n"; 

the closing boundary (ended "--") should placed outside loop:

$headers .= "--".$num."--\r\n";