CodeIgniter: Error on retrieving a single result row - php

Question

Good day!
I have this code in getting an employee's information. (single result)
controller:
public function get_employee_info()
{
$id = $this->input->post("id");
$data["emp_default_info"] = $this->My_model->get_single_result("SELECT * FROM employees WHERE id = '$id' ");
$this->load->view("employee_info_view", $data);
}
model:
public function get_single_result($query_statement)
{
$query = $this->ECS_DB->query($query_statement);
return $query->row_array();
}
view:
foreach ($emp_default_info as $row)
{
echo $id = $row->id;
echo "<br/>".$lname = $row->lname;
echo "<br/>".$fname = $row->fname;
echo "<br/>".$mname = $row->mname;
}
ERROR:
A PHP Error was encountered
Severity: Warning
Message: Invalid argument supplied for foreach()
All I want to do is to return the specific employee's info. I don't know why I got this error.
Any help please?
Thank you!

Answer 1

Try This
Controller :
public function get_employee_info() {
$id = $this->input->post("id");
$data["emp_default_info"] = $this->My_model->get_single_result($id);
$this->load->view("employee_info_view", $data);
}
Model :
public function get_single_result($id)
{
$this->db->where("id",$id);
$query = $this->db->get("employees");
return $query->result();
}
View :
foreach ($emp_default_info as $row)
{
echo $id = $row->id;
echo "<br/>".$lname = $row->lname;
echo "<br/>".$fname = $row->fname;
echo "<br/>".$mname = $row->mname;
}

Answer 2

A PHP Error was encountered
Severity: Warning
Message: Invalid argument supplied for foreach()
Its because $emp_default_info is either null or false or argument is not array
So what you can do is as follows:
Either correct your model code :
public function get_single_result($query_statement)
{
$query = $this->ECS_DB->query($query_statement);
$row = $query->row_array();
if (isset($row)){
return $row;
}
return array();
}
OR
validate in view whether its array
Also $emp_default_info is array because you called row_array();, you can't access like $row->id
if(is_array($emp_default_info) && !empty($emp_default_info))
{
foreach ($emp_default_info as $row)
{
echo $id = $row['id'];
echo "<br/>".$lname = $row['lname'];
echo "<br/>".$fname = $row['fname'];
echo "<br/>".$mname = $row['mname'];
}
}else{
echo "Employee Information not found";
}
We can regenerate this error like this for example
$ php -r 'foreach(null as $e){}'
PHP Warning: Invalid argument supplied for foreach() in Command line code on line 1
/*false OR FALSE*/
$ php -r 'foreach(false as $e){}'
PHP Warning: Invalid argument supplied for foreach() in Command line code on line 1
/* Not array */
$ php -r 'foreach("somestring" as $e){}'
PHP Warning: Invalid argument supplied for foreach() in Command line code on line 1

Answer 3

You do not have use foreach as row_array returns array of specific row only. check documentation for further information
echo $id = $row['id'];
echo "<br/>".$lname = $row['lname'];
echo "<br/>".$fname = $row['fname'];
echo "<br/>".$mname = $row['mname'];

Answer 4

row_array() returns array of results.
View:
echo $id = $row['id'];
echo "<br/>".$lname = $row['lname'];
echo "<br/>".$fname = $row['fname'];
echo "<br/>".$mname = $row['mname'];

Answer 5

You can try with minimum no. of lines.
public function get_employee_info()
{
$id = $this->input->post("id");
$this->db->where('id', $id);
$q = $this->db->get('employees');
$row = array_shift($q->result_array());
echo $row['fname']; //and so on
}
So no need to add code for fetching one record in Model as you did. Its already there in parent model.

Answer 6

Function row_array returns The requested row or NULL if it doesn’t exist.
So if your query fails NULL will be stored in $data["emp_default_info"].
And you need to pass variable of type array/object to foreach, in your case it is might be NULL.Try your output query at database site(workbench or phpmyadmin) first.
If query success it will return a row(single row).So you can loop like
foreach($emp_default_info as $val)
{
echo $val;
}
because it returns only one row you dont need to use a loop.you can access
it by array index directly as $emp_default_info['id'] etc.