Undefined Offset: 0 in Codeigniter - php

Question

When I sen a request this page , I got an error like this
A PHP Error was encountered
Severity: Notice
Message: Undefined offset: 0
Filename: models/mproduk.php
Line Number: 116
This is my controller
public function update($id=''){
$data = array();
$data['size'] = $this->msize->tampil();
$data['eta']=$this->mproduk->berapakah_stoknya($id);
$data['cats'] = $this->mkategori->tampil();
$data['prd'] = $this->mproduk->get_produk_detail($id);
$data['human'] = $this->mhuman->tampil();
$html = array();
$html['header'] = $this->load->view('secuser/header',null,true);
$html['kiri'] = $this->load->view('secuser/kiri',null,true);
$html['content'] = $this->load->view('secuser/product/update',$data,true);
$this->load->view('secuser/template',$html);
}
This is my model
public function berapakah_stoknya($kodepro){
$this->load->model('msize');
$hahaha=$this->msize->tampil();
foreach($hahaha as $wkwkwkw){
$apa= $wkwkwkw['id'];
$sql= "select ukr_$apa from produk where kodeproduk = '".$kodepro. "'";
$ggg= $this->db->query($sql)->result_array();
$return[]=array('stok'=>$ggg[0]["ukr_$apa"],'ukuran'=>$wkwkwkw['ukuran_produk'],'id_'=>$apa);
}
return $return;
}
If I use error_reporting(0) the page will be looping and show to be some page
How can i fix this error?

Answer 1

Your DB query retrieves no results and therefore $ggg is empty and has no 0 index.
Change your model to check if any results were found. If found, add to $return array.
public function berapakah_stoknya($kodepro){
$this->load->model('msize');
$hahaha = $this->msize->tampil();
$return = array();
foreach($hahaha as $wkwkwkw){
$apa= $wkwkwkw['id'];
$sql= "select ukr_$apa from produk where kodeproduk = '".$kodepro. "'";
$ggg= $this->db->query($sql)->result_array();
if(count($ggg)>0){
$return[]=array('stok'=>$ggg[0]["ukr_$apa"],'ukuran'=>$wkwkwkw['ukuran_produk'],'id_'=>$apa);
}
}
return $return;
}
It seems your are expectin to retrieve only one row. So you could use row_array.
public function berapakah_stoknya($kodepro){
$this->load->model('msize');
$hahaha = $this->msize->tampil();
$return = array();
foreach($hahaha as $wkwkwkw){
$apa= $wkwkwkw['id'];
$sql= "select ukr_$apa from produk where kodeproduk = '".$kodepro. "'";
$query = $this->db->query($sql);
if($query->num_rows() > 0){
$ggg = $query->row_array();
$return[]=array('stok'=>$ggg["ukr_$apa"],'ukuran'=>$wkwkwkw['ukuran_produk'],'id_'=>$apa);
}
}
return $return;
}