[英]NEW to PHP… Need Help… Regarding nested functions
我在玩耍,试图将嵌套函数合并到我的登录脚本中。 功能如下。 另外,在我的功能下面是尝试将其合并到登录脚本中的部分。但是,每次我尝试登录时,它都显示无效的用户名。 但是,如果我在登录脚本中使用功能a和b而不是功能d,则一切正常。 有人可以告诉我我错了吗? 谢谢。
//a -username
function username_check($username){
$usercheck = "SELECT user_id FROM users WHERE username ='$username'";
$userqry = mysql_query($usercheck) or die ("Could not match data because ".mysql_error());
$num_rows = mysql_num_rows($userqry);
return ($num_rows == 1) ? true : false;
}
//b - password
function password_check($password, $username){
$passwordcheck = "SELECT password FROM users WHERE username ='$username'";
$passwordqry = mysql_query($passwordcheck) or die ("Could not match data because ".mysql_error());
while($retrievepassword = mysql_fetch_array($passwordqry))
{
$password = md5($password);
return ($password != $retrievepassword['password']) ? true : false;
}
}
//c -email
function email_check($email){
$emailcheck = "SELECT user_id FROM users WHERE email = '$email'";
$emailqry = mysql_query($emailcheck) or die ("Could not match data because ".mysql_error());
$num_rows = mysql_num_rows($emailqry);
return ($num_rows == 1) ? true : false;
}
//d -username + password + email check? all in one? DOESNT WORK
function user_check($username = NULL, $password = NULL, $email = NULL) {
if(($email !=NULL)) {
email_check($email);
}
elseif(($username !=NULL) && ($password!=NULL)){
password_check($password,$username);
}
elseif(($username !=NULL) ) {
username_check($username);
}
}
//LOGIN SCRIPT
if (user_check($username1) ==false) {
$logerrors[] = 'Invalid username';
}
elseif (user_check($password1, $username1)) {
$logerrors[] = 'Incorrect password';`
很好,函数d不返回任何值。
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