PHP: Undefined index even if it exists

Question

It drives me crazy ... I try to parse a csv file and there is a very strange behavior.

Here is the csv

action;id;nom;sites;heures;jours
i;;\"un nom a         


        

Answer 1

Probably there is some special character at the beginning of the first line and trim isn't removing it.

Try to remove every non-word character this way:

// Identify headers
if(!isset($headers))
{
    for($i=0;$i<$cols;$i++)
    {
        $headers[preg_replace("/[^\w\d]/","",strtolower($row[$i]))] = $i;
....