我想用PHP实现一个简单的登录。但是，我还想自定义登录不正确时的错误消息，例如以红色显示错误消息。
登录.php
<form id="frmlogin" name="frmlogin" method="POST" action="validarUsuario.php">
<p><input type="text" name="usuario" id="usuario" class="required" maxlength="50" placeholder="Nombre Usuario"></p>
<p><input type="password" name="password" id="password" class="required" maxlength="50" placeholder="Password"></p>
<p id=error> </p>
<p class="submit"><input type="submit" name="commit" value="Login"></p>
</form>
validarUsuario.php
<?php
include("connection.php");
conectar_bd();
$usr = $_POST['usuario'];
$pw = md5($_POST['password']);
$sql = "SELECT usr FROM Client WHERE usr = '$usr'AND password ='$pw'";
$result = mysql_query($sql, $con);
if ($fila = mysql_fetch_array($result)) {
header('Location: menuclient.php');
} else {
/* How customize my message error */
}
?>
在Login.php文件中，当用户名或密码不正确时，我想显示，例如，在id=error中："登录不正确"为红色。我不知道我是否可以用 php 做到这一点。感谢您的帮助。
您可以使用session .尝试遵循方式。
登录.php
<?php
session_start();
if($_SESSON['error']): ?>
<span>Error : <?php echo $_SESSION['errorMsg']; ?></span>
<?php endif; ?>
<form id="frmlogin" name="frmlogin" method="POST" action="validarUsuario.php">
<p><input type="text" name="usuario" id="usuario" class="required" maxlength="50" placeholder="Nombre Usuario"></p>
<p><input type="password" name="password" id="password" class="required" maxlength="50" placeholder="Password"></p>
<p id=error> </p>
<p class="submit"><input type="submit" name="commit" value="Login"></p>
</form>
validarUsuario.php
<?php
session_start();
include("connection.php");
conectar_bd();
$usr = $_POST['usuario'];
$pw = md5($_POST['password']);
$sql = "SELECT usr FROM Client WHERE usr = '$usr'AND password ='$pw'";
$result=mysql_query($sql,$con);
if( $fila=mysql_fetch_array($result) )
{
header('Location: menuclient.php');
}
else {
$_SESSION['errorMsg'] = "Wrong username or Password";
$_SESSION['error'] = true;
header('Location: Login.php');
}
?>