PHP PDO - Update with bindValue (set and where parametes are same) - php

Question

This is a bit confusing for me, so I will try to explain it the best I can.
I am running update but nothing is happens.
This is the query which I get:
"UPDATE users SET name = :name, surname = :surname WHERE name = :name AND surname = :surname"
I start the query like this:
$data = ['name' => 'Sasha', 'surname' => 'M'];
$user = $users->where(['name' => 'TestName', 'surname' => 'TestSurname'])->update($data);
This is the update function:
public function update($data)
{
$fields = explode(',', $this->prepareFields($data));
$values = explode(',', $this->prepareValues($data));
$i = 0;
$count = count($fields);
$query = "UPDATE {$this->_tablename} SET ";
for($i; $i < $count; $i++):
$query .= $fields[$i] . " = " . $values[$i] . ',';
endfor;
$query = rtrim($query, ',');
$query .= " WHERE " . rtrim($this->_dbWhere, ' AND ');
$this->query($query);
$this->bindData($data);
$this->_dbBind = call_user_func_array('array_merge', $this->_dbBind);
$this->bindData($this->_dbBind);
$this->execute();
return $this->lastInsertId();
}
Where function:
public function where($field, $value = null)
{
if(!is_array($field)):
$this->_dbWhere .= $field . ' = :' . $field . ' AND ';
$this->_dbBind[] = [$field => $value];
else:
foreach($field as $key => $value):
$this->_dbWhere .= $key . ' = :' . $key . ' AND ';
$this->_dbBind[] = [$key => $value];
endforeach;
endif;
return $this;
}
Bind data function:
public function bindData($data)
{
foreach ($data as $key => $value) :
$this->bind(':' . $key, $value);
endforeach;
}
public function bind($param, $value, $type = null){
if (is_null($type)) {
switch (true) {
case is_int($value):
$type = \PDO::PARAM_INT;
break;
case is_bool($value):
$type = \PDO::PARAM_BOOL;
break;
case is_null($value):
$type = \PDO::PARAM_NULL;
break;
default:
$type = \PDO::PARAM_STR;
}
}
$this->stmt->bindValue($param, $value, $type);
}
Prepare fields and prepare values:
public function prepareFields($data)
{
return $fields = implode(', ', array_keys($data));
}
public function prepareValues($data)
{
$values = implode(', :', array_keys($data));
return ':' . $values;
}
Query function:
public function query($query){
$this->stmt = $this->handler->prepare($query);
}

Answer 1

The crux of this is that you use the same placeholder :fieldname in the WHERE clause and in the SET portion of the statement. You do need to correct other small issues raised here, but a simple solution is to make this change in the where() function:
if(!is_array($field)):
// make up a placeholder name distinct from the one used in SET clause
$field_placeholder = ":where_".$field
$this->_dbWhere .= $field . ' = ' . $field_placeholder . ' AND ';
$this->_dbBind[] = [$field_placeholder => $value];
else: