Wrong parameter count for bind_param in custom mysqli class - php

Question

Trying to generate a custom mysqli class / wrapper with $this->_mysqli as a mysqli instance:
// Query string generator
private function gen_query($type, $data, $table){
switch ($type) {
case 'ins':
$query = "INSERT INTO " .$table .' ';
$query .= implode_key($opr= ', ', $data);
$query .= " VALUES " . value($data);
break;
case 'select':
// yet to generate
default:
$query ='';
break;
}
return $query;
}
// Generates bind parameters
private function gen_param($data){
$_param = "'";
foreach ($data as $v) {
$_param .= $this->detect_type($v);
}
$_param .= "', ";
foreach ($data as $k=>$v) {
if($v == end($data)) {
$_param .="$$k";
continue;
}
$_param .= "$$k, ";
}
return $_param;
}
public function insert( $table, $data ){
$table = $this->_prefix . $table;
$table = $this->escape($table);
$query = $this->gen_query('ins', $data, $table);
$stmt = $this->_mysqli->prepare($query);
foreach ($data as $key => $value) {
$$key = $value;
}
$test = $this->gen_param($data);
if(!$stmt->bind_param($test)) {
echo $this->_mysqli->error;
}
if($stmt->execute()){
print 'Success!'.'<br />';
} else {
die('Error : ('. $this->_mysqli->errno .') '. $this->_mysqli->error);
}
}
So when user inputs
$data = [ 'first_name' => 'foo', 'last_name' => 'bar', 'another_field' => 'blah'];
$db->insert('t1', $data);
I get this error:
Warning: Wrong parameter count for mysqli_stmt::bind_param() in path\to\class-db.php on line 138
This is line 138: if(!$stmt->bind_param($test))

Answer 1

Not sure why the question was downvoted. Anyways, I got this fixed by referring: this repo.
We'll need to get rid of gen_param, use an array instead and call using a callback function to get the parameter values right and refer the values.
The code is now:
public function insert( $table, $data ){
$table = $this->_prefix . $table;
$table = $this->escape($table);
$this->esc_sql_arr($data);
$query = $this->gen_query('ins', $data, $table);
$stmt = $this->_mysqli->prepare($query);
$this->_bind_param($data);
call_user_func_array(array($stmt, 'bind_param'),$this->return_ref($this->bind_arr));
if($stmt->execute()){
echo "Success!";
}else{
die('Error : ('. $this->_mysqli->errno .') '. $this->_mysqli->error);
}
$this->reset();
}
private function _bind_param($data){
foreach($data as $key=>$value) {
$this->_bind_values($value);
}
}
private function _bind_values($value) {
$this->bind_arr[0] .= $this->detect_type($value);
array_push($this->bind_arr, $value);
}
protected function return_ref(array &$arr)
{
//Reference in the function arguments are required for HHVM to work
//https://github.com/facebook/hhvm/issues/5155
//Referenced data array is required by mysqli since PHP 5.3+
if (strnatcmp(phpversion(), '5.3') >= 0) {
$refs = array();
foreach ($arr as $key => $value) {
$refs[$key] = & $arr[$key];
}
return $refs;
}
return $arr;
}
The code is nowhere near complete, but this got me started.