PHP Check Email function

Source: Internet
Author: User

Check the work of e-mail for some registered classes of the site is very necessary, the following has a good function, you can refer to the next

The code is as follows: function is_valid_email_address ($email) {$qtext = ' [^//x0d//x22//x5c//x80-//xff] ';  $dtext = ' [^//x0d//x5b-//x5d//x80-//xff] ';  $atom = ' [^//x00-//x20//x22//x28//x29//x2c//x2e//x3a-//x3c '].  '//x3e//x40//x5b-//x5d//x7f-//xff]+ ';  $quoted _pair = '//x5c[//x00-//x7f] ';  $domain _literal = "//x5b ($dtext | $quoted _pair) *//x5d";  $quoted _string = "//x22 ($qtext | $quoted _pair) *//x22";  $domain _ref = $atom;  $sub _domain = "($domain _ref| $domain _literal)";  $word = "($atom | $quoted _string)";  $domain = "$sub _domain (//x2e$sub_domain) *";  $local _part = "$word (//x2e$word) *";  $addr _spec = "$local _part//x40$domain"; Return Preg_match ("!^ $addr _spec$!", $email)?  1:0; }
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