PHP POST via JSON is empty - php

Question

I have a basic form that post to PHP file.
<form action="index.php" method="POST">
<input name="operation" id="operation" placeholder="operation" />
<br>
<input id="name" name="name" placeholder="Name" />
<br>
<input id="email" name="email" placeholder="Email"/>
<br>
<input id="password" name="password" placeholder="Password"/>
<br>
<button type="submit" >POST</button>
</form>
problem is the operation is posting NULL or empty via the index file below.
I am using the basic php://input to get encoded via json.
if ($_SERVER['REQUEST_METHOD'] == 'POST')
{
$data = json_decode(file_get_contents('php://input'));
if(isset($data -> operation)){
$operation = $data -> operation;
echo $operation;
if(!empty($operation)){
}else{
//$operation is empty ...
}
}else{
//$operation is not set ...
}
}
However echoing the file_get_contents('php://input') displays the correct values from the posted form.
Any reason why the $operation return is always empty?

Answer 1

Your data should be prepared before convert to Json format Try this code :)
I test this Code, it work.
Good Luck
if ($_SERVER['REQUEST_METHOD'] == 'POST')
{
$data = file_get_contents('php://input');
$data = str_replace('=','":"',$data);
$data = str_replace('&','","',$data);
$data = '{"'.$data.'"}';
$data = json_decode($data);
if(isset($data->operation)){
$operation = $data -> operation;
echo $operation;
if(!empty($operation)){
echo "NOT EMPTY";
}else{
echo "IS EMPTY";
//$operation is empty ...
}
}else{
echo "NO OPERATION";
//$operation is not set ...
}
}