Validate Email in PHP

public function validar_email($email) { $mail_correcto = 0; if ((strlen($email) >= 6) && (substr_count($email, "@") == 1) && (substr($email, 0, 1) != "@") && (substr($email, strlen($email) - 1, 1) != "@")) { if ((!strstr($email, "'")) && (!strstr($email, "\"")) && (!strstr($email, "\\")) && (!strstr($email, "\$")) && (!strstr($email, " "))) {//miro si tiene caracter . if (substr_count($email, ".") >= 1) {//obtengo la terminacion del dominio $term_dom = substr(strrchr($email, '.'), 1); //compruebo que la terminaci?n del dominio sea correcta if (strlen($term_dom) > 1 && strlen($term_dom) < 5 && (!strstr($term_dom, "@"))) {//compruebo que lo de antes del dominio sea correcto $antes_dom = substr($email, 0, strlen($email) - strlen($term_dom) - 1); $caracter_ult = substr($antes_dom, strlen($antes_dom) - 1, 1); if ($caracter_ult != "@" && $caracter_ult != ".") { $mail_correcto = 1; } } } } } if ($mail_correcto) return 1; else return 0; }