[英]PHP page shows up blank
我是PHP的新手,我正在按照本教程創建登錄頁面。 當我完成輔導課程后,頁面完全是白色的,視圖資源也顯示了空白頁面。 這是我得到的錯誤“發生解析錯誤消息:語法錯誤,文件意外結束”,這是代碼:
<?php
include_once 'psl-config.php';
function sec_session_start() {
$session_name = 'sec_session_id'; // Set a custom session name
$secure = SECURE;
// This stops JavaScript being able to access the session id.
$httponly = true;
// Forces sessions to only use cookies.
if (ini_set('session.use_only_cookies', 1) === FALSE) {
header("Location: ../error.php?err=Could not initiate a safe session (ini_set)");
exit();
}
// Gets current cookies params.
$cookieParams = session_get_cookie_params();
session_set_cookie_params($cookieParams["lifetime"],
$cookieParams["path"],
$cookieParams["domain"],
$secure,
$httponly);
// Sets the session name to the one set above.
session_name($session_name);
session_start(); // Start the PHP session
session_regenerate_id(); // regenerated the session, delete the old one.
function login($email, $password, $mysqli) {
// Using prepared statements means that SQL injection is not possible.
if ($stmt = $mysqli->prepare("SELECT id, username, password, salt
FROM members
WHERE email = ?
LIMIT 1")) {
$stmt->bind_param('s', $email); // Bind "$email" to parameter.
$stmt->execute(); // Execute the prepared query.
$stmt->store_result();
// get variables from result.
$stmt->bind_result($user_id, $username, $db_password, $salt);
$stmt->fetch();
// hash the password with the unique salt.
$password = hash('sha512', $password . $salt);
if ($stmt->num_rows == 1) {
// If the user exists we check if the account is locked
// from too many login attempts
if (checkbrute($user_id, $mysqli) == true) {
// Account is locked
// Send an email to user saying their account is locked
return false;
} else {
// Check if the password in the database matches
// the password the user submitted.
if ($db_password == $password) {
// Password is correct!
// Get the user-agent string of the user.
$user_browser = $_SERVER['HTTP_USER_AGENT'];
// XSS protection as we might print this value
$user_id = preg_replace("/[^0-9]+/", "", $user_id);
$_SESSION['user_id'] = $user_id;
// XSS protection as we might print this value
$username = preg_replace("/[^a-zA-Z0-9_\-]+/",
"",
$username);
$_SESSION['username'] = $username;
$_SESSION['login_string'] = hash('sha512',
$password . $user_browser);
// Login successful.
return true;
} else {
// Password is not correct
// We record this attempt in the database
$now = time();
$mysqli->query("INSERT INTO login_attempts(user_id, time)
VALUES ('$user_id', '$now')");
return false;
}
}
} else {
// No user exists.
return false;
}
}
}
function checkbrute($user_id, $mysqli) {
// Get timestamp of current time
$now = time();
// All login attempts are counted from the past 2 hours.
$valid_attempts = $now - (2 * 60 * 60);
if ($stmt = $mysqli->prepare("SELECT time
FROM login_attempts
WHERE user_id = ?
AND time > '$valid_attempts'")) {
$stmt->bind_param('i', $user_id);
// Execute the prepared query.
$stmt->execute();
$stmt->store_result();
// If there have been more than 5 failed logins
if ($stmt->num_rows > 5) {
return true;
} else {
return false;
}
}
}
function esc_url($url) {
if ('' == $url) {
return $url;
}
$url = preg_replace('|[^a-z0-9-~+_.?#=!&;,/:%@$\|*\'()\\x80-\\xff]|i', '', $url);
$strip = array('%0d', '%0a', '%0D', '%0A');
$url = (string) $url;
$count = 1;
while ($count) {
$url = str_replace($strip, '', $url, $count);
}
$url = str_replace(';//', '://', $url);
$url = htmlentities($url);
$url = str_replace('&', '&', $url);
$url = str_replace("'", ''', $url);
if ($url[0] !== '/') {
// We're only interested in relative links from $_SERVER['PHP_SELF']
return '';
} else {
return $url;
}
}
?>
我猜您的問題出在這些腳本中...
include_once 'includes/db_connect.php';
include_once 'includes/functions.php';
正如其他人提到的那樣,您可以在php.ini中啟用錯誤報告功能,但是我相信默認情況下它是啟用的。 您需要做的是確保對這些腳本中的所有命令進行了錯誤檢查。
編輯:刪除自sec_session_start();
以來的最后建議sec_session_start();
是您教程中的功能。 它必須在那里。
(1)將以下各行放在腳本的正下方<?php
ini_set('display_errors', 1);
error_reporting(E_ALL);
(2)替換sec_session_start();
到session_start();
它應該可以解決問題!
這是我查看您的代碼時看到的:
<?php
include_once 'psl-config.php';
function sec_session_start() {
// lot of code here
// but closing tag of the function is missing
// therefore following functions are actually define inside sec_session_start()
// this should produce a parser error.
function login($email, $password, $mysqli) {
// lot of code here
}
function esc_url($url) {
// code
}
?>
因此,首先,您應該獲得解析器顯示的錯誤:
ini_set('display_errors', 1);
error_reporting(E_ALL);
另外,我看不到您實際上在任何地方調用了這些函數。 定義函數不會在輸出中添加任何內容(即使函數本身具有echo
/ print
語句)。
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