PHP + MySQL获取数据并将其放入数据库

Question

How can I put and read data from PHP and MySQL? I tried the following:

$pwdcrypt = SHA1($pwd);
echo "Now we put some data to the database!";
$userregisterquery="INSERT INTO user (email, password) VALUES ('$email', '$pwdcrypt')";
echo $userregisterquery;
mysqli_query($link, $userregisterquery);

$usergetdataquery="SELECT email, password FROM user WHERE email='$email'";
echo $usergetdataquery.'</br>'; 
$result =  mysqli_query($link, $usergetdataquery);
$row = mysqli_fetch_row($result);
print_r($row);

// get the user_id
$useridquery="SELECT user.id FROM user WHERE email = '$email'";
echo $useridquery.'</br>'; 
$result = mysqli_query($link, $useridquery);
$row = mysqli_fetch_array($result);  
echo "the result is:".print_r($row);
mysqli_close($link);

It outputs, for example:

Now we put some data to the database!INSERT INTO user (email, password) VALUES ('fdjisadds@as.com', 'cf860129c95e6afcdb9f9a390354915cde81c40c')We put email: fdjisadds@as.com and password: cf860129c95e6afcdb9f9a390354915cde81c40c to the database.SELECT email, password FROM user WHERE email='fdjisadds@as.com'We get: 1

As I checked that id=1, I found that it is some other user I put there via SQL-terminal and no email fdjisadds@as.com.

Answer 1

Well, obviously $row = mysqli_fetch_array($link, $useridquery) fetches an array of results. print_r($row) is then printing that array to the output stream and returns true which is concatenated to the string as 1 .

From the PHP manual

If given a string, integer or float, the value itself will be printed. If given an array, values will be presented in a format that shows keys and elements. Similar notation is used for objects. When the return parameter is TRUE, this function will return a string. Otherwise, the return value is TRUE.

So try this instead:

// This would concatenate the print_r's result to the string
echo "the result is:".print_r($row, true);

// Or better yet, use the following
echo "the result is:".$row[0]

EDIT Regarding the questionaire's last comment:

ALTER TABLE `user`
CHANGE COLUMN `id` `id` INT(10) UNSIGNED NOT NULL AUTO_INCREMENT;

Be aware, though, that based on the limited insight you provided, this could break some other logic of yours.