eu gostaria de saber como posso "desativar" ou "ativar" uma class a partir do php, clicando o botão.
<!DOCTYPE html>
<html lang="pt-br">
<head>
<meta charset="utf-8">
<meta name="vieport" content="width=device-widht, initial-scale=1.0">
<meta http-equiv="X-UA-Comapatible" content="ie=edge">
<title>Barra de Progesso Oficial</title>
<style type="text/css">
.container{
width: 100%;
}
.step-pog-bar{
margin-top: 20%;
counter-reset: step;
}
.step-pog-bar li{
list-style: none;
float: left;
width: 20%;
position: relative;
text-align: center;
}
.step-pog-bar li::before{
content: counter(step);
counter-increment: step;
width: 30px;
height: 30px;
line-height: 30px;
border: 2px solid #ddd;
display: block;
text-align: center;
margin: 0 auto 10px auto;
border-radius: 50%;
background-color: #fff;
}
.step-pog-bar li::after{
content: '';
position: absolute;
top: 15px;
left: -50%;
border: 2px solid #ddd;
width: 100%;
z-index: -1;
}
.step-pog-bar li:first-child::after{
content: none;
}
.step-pog-bar li.active{
color: chartreuse;
}
.step-pog-bar li.active::before{
border-color: chartreuse;
}
.step-pog-bar li.active + li::after{
border-color: chartreuse;
}
.btn{
margin-top: 100px;
position: absolute;
margin-left: 20%;
}
.btn_D{
margin-top: 100px;
position: absolute;
margin-left: 10%;
}
</style>
</head>
<body>
<div class="btn">
<input type="submit" value="ativar">
</div>
<div class="btn_D">
<input type="submit" value="Desativar">
</div>
<div class="container">
<ul class="step-pog-bar">
<li class="active">Canal Dentario</li>
<li class="active">Limpeza</li>
<li class="active">Clareamento</li>
<li class="active">Escovação</li>
<li>Conclusão</li>
</ul>
</div>
</body>
</html>