PHP Error was encountered Codeigniter - php

Question

someone from freelancer created this web based software for us. By mistake i deleted all the medical examination (i'm a doctor assistant) from the control panel.
The software now gives me this error:
Message: Undefined variable: data
Filename: models/gestione_model.php
Line Number: 127
A PHP Error was encountered
Severity: Warning
Message: Invalid argument supplied for foreach()
Filename: models/gestione_model.php
Line Number: 127
A PHP Error was encountered
Severity: Notice
Message: Undefined variable: data
Filename: models/gestione_model.php
Line Number: 127
A PHP Error was encountered
Severity: Warning
Message: Invalid argument supplied for foreach()
Filename: models/gestione_model.php
Line Number: 127
I find the line 27 here:
public function conta_visite($s)
{
$query = $this->db->get('oggetti');
if ($query->num_rows() > 0) {
$data = $query->result_array();
}
$aperte = 0;
$chiuse = 0;
foreach ($data as $d) {
if (new DateTime() > new DateTime($d['DataVisita'])) $chiuse++;
else $aperte++;
}
if($s == 1) return $aperte;
else return $chiuse;
}
Can someone help me please? Thanks

Answer 1

you are closing IF before foreach!
public function conta_visite($s) {
$query = $this->db->get('oggetti');
if ($query->num_rows() > 0) {
$data = $query->result_array();
} // HERE if result is ==0 then $data does not exist
$aperte = 0; $chiuse = 0; foreach ($data as $d) {
if (new DateTime() > new DateTime($d['DataVisita'])) $chiuse++;
else $aperte++;
}
if($s == 1) return $aperte;
else return $chiuse;

Answer 2

You need to make sure that $data is set before using it. If no rows are returned then $data is not set and you get errors when trying to process it.
if ($query->num_rows() > 0) {
$data = $query->result_array();
} else {
//do what needs to be done if the database does not return any rows
$data = array(); //empty array maybe?
}