PHP can anyone explain this var dump - php

Question

This var dump is returned when results are found, why would it be throwing an error if it is finding results.
object(DB)#3 (5) { ["_pdo":"DB":private]=> object(PDO)#4 (0) { } ["_query":"DB":private]=> object(PDOStatement)#6 (1) { ["queryString"]=> string(80) "SELECT * FROM `activity` WHERE `name` = ? AND `act_date` = ? AND `time_from` = ?" } ["_error":"DB":private]=> bool(false) ["_results":"DB":private]=> array(3) { [0]=> object(stdClass)#7 (7) { ["activity_id"]=> string(1) "6" ["name"]=> string(7) "Archery" ["act_date"]=> string(10) "12/01/2015" ["time_from"]=> string(5) "10.00" ["time_to"]=> string(5) "11.00" ["num_people"]=> string(2) "12" ["booking_id"]=> string(1) "1" } [1]=> object(stdClass)#8 (7) { ["activity_id"]=> string(2) "13" ["name"]=> string(7) "Archery" ["act_date"]=> string(10) "12/01/2015" ["time_from"]=> string(5) "10.00" ["time_to"]=> string(5) "11.00" ["num_people"]=> string(2) "10" ["booking_id"]=> string(1) "1" } [2]=> object(stdClass)#9 (7) { ["activity_id"]=> string(2) "56" ["name"]=> string(7) "Archery" ["act_date"]=> string(10) "12/01/2015" ["time_from"]=> string(5) "10.00" ["time_to"]=> string(5) "11.00" ["num_people"]=> string(2) "10" ["booking_id"]=> string(1) "2" } } ["_count":"DB":private]=> int(3) }
This var dump is returned when the query cannot find any results:
object(DB)#3 (5) { ["_pdo":"DB":private]=> object(PDO)#4 (0) { } ["_query":"DB":private]=> object(PDOStatement)#6 (1) { ["queryString"]=> string(80) "SELECT * FROM `activity` WHERE `name` = ? AND `act_date` = ? AND `time_from` = ?" } ["_error":"DB":private]=> bool(false) ["_results":"DB":private]=> array(0) { } ["_count":"DB":private]=> int(0) }
The query is called:
!$activity->checkDateTimeAvailability($act_name, $act_date, $time_from)
// Method to check if the activity is available at the requested date and time.
public function checkDateTimeAvailability($act_name, $act_date, $time_from) {
$fields = array($act_name, $act_date, $time_from);
$result = $this->_db->query("SELECT * FROM `activity` WHERE `name` = ? AND `act_date` = ?
AND `time_from` = ?", $fields);
var_dump($result);
if(!empty($result)){
echo "query successful";
return true;
} else {
return false;
}
}
The DB Query Method:
// Generic query method.
public function query($sql, $params = array()) {
// reset to ensure an error from a previous query is not returned.
$this->_error = false;
if($this->_query = $this->_pdo->prepare($sql)) {
$x = 1;
if(count($params)) {
foreach($params as $param) {
$this->_query->bindValue($x, $param);
$x++;
}
}
if($this->_query->execute()) {
$this->_results = $this->_query->fetchAll(PDO::FETCH_OBJ);
$this->_count = $this->_query->rowCount();
} else {
$this->_error = true;
echo 'Error: ', $this->_error;
}
}
return $this;
}

Answer 1

Looks like this code works pretty fine.
First you save link to the DB object to $result variable, then you use var_dump and there should be a message "query successful" and checkDateTimeAvailability function will always return true to the calling side.
Probably, you should get query result from DB object or selected rows count. !empty($result) will always be true, because $result - is object, not array of data, fetched from query.
EDITED
You have serveral opportunities:
First
Look up DB class, where query method described and look for methods like Count() or GetResult(). If such methods exists - use them.
if ($result->count() > 0){
echo "query successful";
return true;
} else {
return false;
}
Second
If there is no such methods in DB class, and this is not some library class you can add your own realisation of Count method
public function count() {
return $this->_count;
}
It would be much easier, if i could see all DB class.