Accessing object's properties via array index

Question

I have a situation where i have to programmatically do database inserts. I have multiple tables but the order of information of those tables are similar , i.e, in each table, the first coulmn in id, and second is a foregin key, and third is a name, and fourth is a blob and fifth is a text.

I searched php doc and found that I can use $objectName[index] to access the database property. I am getting error

Cannot use object of type stdClass as array in C:\....php on line .. .

The erroneous line is indicated on the code

private function uploadTemp($databaseObject, $table_name){
    $this->load->database();
    //get file_contents too;
    $file_id = $databaseObject[3]; // < Here's where the error appeared
    $this->db->from('tbl_file')->where('file_id',$file_id); 
    $q = $this->db->get();
    $data = $q->row();
    $query = "INSERT INTO $table_name VALUES(NULL, '".$databaseObject[2]."','".$data->filecontent."');";
    $this->db->query($query);
}

I am using CodeIgniter as a framework.

Isn't it the line before the marked one, i.e. $file_id = $databaseObject[3]; that triggers the error? — VolkerK
– VolkerK, Commented Jun 26, 2013 at 7:32
@VolkerK The second line trigged that! That made be surprised! — cipher
– cipher, Commented Jun 26, 2013 at 7:33

sybear · Accepted Answer · 2013-06-26 07:49:37Z

5

Try casting to array:

$file_id = (array) $databaseObject[3];

As STDClass is just a dummy container with public dynamic variables and no methods, there should be no problems in casting it to array and backwards as well.

However in some situations numbers are used to represent a variable name.

Example:

$array ; //Is some array created by engines / database handlers.

$obj = (object) $array ;

echo $obj->0 ; //Hell it will not work.
echo $obj[0] ; //The same problem.

echo $obj->{'0'} ; //PERFECT

edited Jun 26, 2013 at 7:49

answered Jun 26, 2013 at 7:33

sybear

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3 Comments

sybear Over a year ago

What if you try: $file_id = $databaseObject->{'3'}; ?

cipher Over a year ago

Actually my database object had different identifiers depending upon cases, but had the same kind of data in the third position! And I was trying to get the third data. I guess the method is same!

sybear Over a year ago

IMO it is a really wrong stuff that CodeIgniter encases data into objects. Objects must contain properties with real names. Arrays must contain sets of data and be number-indexed usually.

Rajeev Ranjan · Accepted Answer · 2013-06-26 07:41:02Z

1

try this function get_object_vars()

or create function to convert to array

function array_to_object($array)//from CodeIgniter forum
 {
  return (is_array($array)) ? (object) array_map(__FUNCTION__, $array) : $array;
 }

answered Jun 26, 2013 at 7:41

Rajeev Ranjan

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