Var_dump changes "something" in my variable? - php

Question

So I am currently coding a user registration in PHP 5.6.10 and just discovered something weird: The function Token::check(Input::get('token')) returns a boolean. If it returns true, the if-statement is getting executed. Works fine so far, however when I var_dump it previous to the if-statement, the if-statement is not being executed.
Is there any explanation for this behaviour?
var_dump(Token::check(Input::get('token')));
if(Input::exists()) {
if(Token::check(Input::get('token'))) {
echo "Loop.";
$validate = new Validate();
$validation = $validate->check($_POST, array(
'first_name' => array(
'required' => true,
'min' => 1,
'max' => 50
)
));
if($validation->passed()) {
echo "Die Eingaben waren korrekt.";
} else {
foreach ($validation->errors() as $error) {
echo $error,"<br>";
}
echo "<br>";
}
}
}
(I hope I didn't make a typo when shortening the code)
Here is the check()-function as requested:
public static function check($token) {
$tokenName = Config::get('session/token_name');
if(Session::exists($tokenName) && $token === Session::get($tokenName)) {
Session::delete($tokenName);
return true;
}
return false;
}

Answer 1

Based on the code from the check method:
public static function check($token) {
$tokenName = Config::get('session/token_name');
if(Session::exists($tokenName) && $token === Session::get($tokenName)){
Session::delete($tokenName);
return true;
}
return false;
}
In the first time that you call:
var_dump(Token::check(Input::get('token')));
it deletes the token from the session, preventing the condition:
if(Token::check(Input::get('token'))) to be met.
Maybe you can put an extra param in the check function just to help you debug and not delete the token:
public static function check($token, $test = false) {
$tokenName = Config::get('session/token_name');
if(Session::exists($tokenName) && $token === Session::get($tokenName)){
if (!$test) {
Session::delete($tokenName);
}
return true;
}
return false;
}