Created
April 17, 2012 06:43
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检验是否为有效的电子邮件地址的 PHP 函数
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<?php | |
/** | |
* 检验是否为有效的电子邮件地址 | |
* | |
* 根据 http://www.linuxjournal.com/article/9585 编写 | |
* | |
* @param string $email | |
* @return bool | |
*/ | |
function is_valid_email($email) { | |
// 是否存在@ | |
$at_index = strrpos($email, '@'); | |
if ($at_index === false) | |
return false; | |
// 分离信息 | |
$local = substr($email, 0, $at_index); | |
$domain = substr($email, $at_index + 1); | |
$local_len = strlen($local); | |
$domain_len = strlen($domain); | |
// 检查有效性 | |
if ($local_len < 1 || $local_len > 64) | |
return false; | |
if ($domain_len < 1 || $domain_len > 255) | |
return false; | |
if ($local[0] == '.' || $local[$local_len - 1] == '.') | |
return false; | |
if (strpos($local, '..') !== false) | |
return false; | |
if (strpos($domain, '..') !== false) | |
return false; | |
if (! preg_match('/^[A-Za-z0-9.-]+[A-Za-z0-9]$/', $domain)) | |
return false; | |
if (! preg_match('/^"[^"]+"$/', $local)) { | |
if (! preg_match('/^[A-Za-z0-9!#$%&\'*+\\/=?^_`{|}~.-]+$/', substr($local, 1, -1))) | |
return false; | |
} | |
if (! (checkdnsrr($domain, 'MX') || checkdnsrr($domain, 'A'))) | |
return false; | |
return true; | |
} | |
?> |
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