Simple form validation with PHP - Login Screen : <p>I know there is many ways to do a login form validation with mysql, but i'm trying to make a simple form validation with php. I'm getting this error: </p>

<blockquote>
  <p>Parse error: syntax error, unexpected 'echo' (T_ECHO) in
  C:\xampp2\htdocs\one\homedir\public_html\calendario\valida.php on line
  11</p>
</blockquote>

<p>Here is my form:</p>

<p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
<div class="snippet-code">
<pre class="snippet-code-css lang-css prettyprint-override"><code>body {
  font-family: "Open Sans", sans-serif;
  height: 100vh;
  background: url("https://i.imgur.com/HgflTDf.jpg") 50% fixed;
  background-size: cover;
}

@keyframes spinner {
  0% {
    transform: rotateZ(0deg);
  }
  100% {
    transform: rotateZ(359deg);
  }
}
* {
  box-sizing: border-box;
}

.wrapper {
  display: flex;
  align-items: center;
  flex-direction: column;
  justify-content: center;
  width: 100%;
  min-height: 100%;
  padding: 20px;
  background: rgba(4, 40, 68, 0.85);
}

.login {
  border-radius: 2px 2px 5px 5px;
  padding: 10px 20px 20px 20px;
  width: 90%;
  max-width: 320px;
  background: #ffffff;
  position: relative;
  padding-bottom: 80px;
  box-shadow: 0px 1px 5px rgba(0, 0, 0, 0.3);
}
.login.loading button {
  max-height: 100%;
  padding-top: 50px;
}
.login.loading button .spinner {
  opacity: 1;
  top: 40%;
}
.login.ok button {
  background-color: #8bc34a;
}
.login.ok button .spinner {
  border-radius: 0;
  border-top-color: transparent;
  border-right-color: transparent;
  height: 20px;
  animation: none;
  transform: rotateZ(-45deg);
}
.login input {
  display: block;
  padding: 15px 10px;
  margin-bottom: 10px;
  width: 100%;
  border: 1px solid #ddd;
  transition: border-width 0.2s ease;
  border-radius: 2px;
  color: #ccc;
}
.login input + i.fa {
  color: #fff;
  font-size: 1em;
  position: absolute;
  margin-top: -47px;
  opacity: 0;
  left: 0;
  transition: all 0.1s ease-in;
}
.login input:focus {
  outline: none;
  color: #444;
  border-color: #2196F3;
  border-left-width: 35px;
}
.login input:focus + i.fa {
  opacity: 1;
  left: 30px;
  transition: all 0.25s ease-out;
}
.login a {
  font-size: 0.8em;
  color: #2196F3;
  text-decoration: none;
}
.login .title {
  color: #444;
  font-size: 1.2em;
  font-weight: bold;
  margin: 10px 0 30px 0;
  border-bottom: 1px solid #eee;
  padding-bottom: 20px;
}
.login button {
  width: 100%;
  height: 100%;
  padding: 10px 10px;
  background: #2196F3;
  color: #fff;
  display: block;
  border: none;
  margin-top: 20px;
  position: absolute;
  left: 0;
  bottom: 0;
  max-height: 60px;
  border: 0px solid rgba(0, 0, 0, 0.1);
  border-radius: 0 0 2px 2px;
  transform: rotateZ(0deg);
  transition: all 0.1s ease-out;
  border-bottom-width: 7px;
}
.login button .spinner {
  display: block;
  width: 40px;
  height: 40px;
  position: absolute;
  border: 4px solid #ffffff;
  border-top-color: rgba(255, 255, 255, 0.3);
  border-radius: 100%;
  left: 50%;
  top: 0;
  opacity: 0;
  margin-left: -20px;
  margin-top: -20px;
  animation: spinner 0.6s infinite linear;
  transition: top 0.3s 0.3s ease, opacity 0.3s 0.3s ease, border-radius 0.3s ease;
  box-shadow: 0px 1px 0px rgba(0, 0, 0, 0.2);
}
.login:not(.loading) button:hover {
  box-shadow: 0px 1px 3px #2196F3;
}
.login:not(.loading) button:focus {
  border-bottom-width: 4px;
}

footer {
  display: block;
  padding-top: 50px;
  text-align: center;
  color: #ddd;
  font-weight: normal;
  text-shadow: 0px -1px 0px rgba(0, 0, 0, 0.2);
  font-size: 0.8em;
}
footer a, footer a:link {
  color: #fff;
  text-decoration: none;
}</code></pre>
<pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;!DOCTYPE html&gt;
&lt;html lang="en" &gt;
&lt;head&gt;
  &lt;meta charset="UTF-8"&gt;
  &lt;title&gt;Calendário de E-mail marketing&lt;/title&gt;
  &lt;link href='https://fonts.googleapis.com/css?family=Open+Sans:400,700' rel='stylesheet' type='text/css'&gt;
&lt;link rel="stylesheet" href="//maxcdn.bootstrapcdn.com/font-awesome/4.3.0/css/font-awesome.min.css"&gt;
  &lt;link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/normalize/5.0.0/normalize.min.css"&gt;

  
   

  &lt;script src="https://cdnjs.cloudflare.com/ajax/libs/prefixfree/1.0.7/prefixfree.min.js"&gt;&lt;/script&gt;

&lt;/head&gt;

&lt;body&gt;
  &lt;div class="wrapper"&gt;
  &lt;form class="login" action="valida.php" method="post"&gt;
    &lt;p class="title"&gt;Log in&lt;/p&gt;
    &lt;input id="usuario" class="usuario" type="text" placeholder="Usuário" autofocus/&gt;
    &lt;i class="fa fa-user"&gt;&lt;/i&gt;
    &lt;input id="senha" clas="senha" type="password" placeholder="Senha" /&gt;
    &lt;i class="fa fa-key"&gt;&lt;/i&gt;

    &lt;button&gt;
      &lt;i class="spinner"&gt;&lt;/i&gt;
      &lt;span class="state"&gt;Log in&lt;/span&gt;
    &lt;/button&gt;
  &lt;/form&gt;
  &lt;footer&gt;2017 One Imóveis de Luxo&lt;/footer&gt;
  &lt;/p&gt;
&lt;/div&gt;
  &lt;script src='http://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js'&gt;&lt;/script&gt;

    

&lt;/body&gt;
&lt;/html&gt;</code></pre>
</div>
</div>
</p>

<p>And, most important, here is my php file:</p>

<p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
<div class="snippet-code">
<pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;?php



$usuario = $_POST['usuario'];
$senha = $_POST['senha'];



if( ($usuario=='marketing') &amp;&amp; ($senha=='onecia40012121') {
    echo header('Location: http://www.onecia.com.br/ato/?lead=ok');   THIS LINE HAVE A PROBLEM
} else {
    echo  "&lt;script&gt;alert('Login ou senha incorretos!');&lt;/script&gt;";
}



?&gt;</code></pre>
</div>
</div>
</p>

<p>Wait for your help, thanks!</p>
