php发送邮件函数mail 教程

<?php 
	//定义边界线 
	$boundary = uniqid( "" );  
	//生成邮件头 
	$header = "From: $fromnContent-type: multipart/mixed; 
	boundary="$boundary"nX-Mailer:PHPnX-Priority:3"; 
	//获取附件文件的MIME类型  
	$mimetype = mime_content_type(&#39;test.zip&#39;) 
	//获取附件文件的名字  
	$attach = &#39;test.zip&#39; 
	//对附件文件进行编码和切分 
	$fp = fopen($attach, "r"); 
	$content = fread($fp, filesize($attach)); 
	$content = chunk_split( base64_encode($content) ); 
	//生成邮件主体  
	$body =" 
	--$boundary 
	Content-type: text/plain; charset=iso-8859-1 
	Content-transfer-encoding: 8bit 
	$message 
	--$boundary 
	Content-Type: $mimeType; name=$filename 
	Content-Disposition: attachment; filename=$filename 
	Content-Transfer-Encoding: base64 
	$content 
	--$boundary--"; 
	//发送邮件 
	mail( $to, $subject, $body, $header );