PHP Notice: Undefined offset error when importing

问题:

This question already has an answer here:

• “Notice: Undefined variable”, “Notice: Undefined index”, and “Notice: Undefined offset” using PHP 28 answers

I'm continually getting the above error when importing data from csv using the following code:

$csv_data=file_get_contents("data3_received.csv");
foreach(preg_split("/((\r?\n)|(\r\n?))/", $csv_data) as $line){
list($service_id, $ki3) = explode(',', $line,2);

The data imports as expected but the error log is filling up as we utilise the same code in multiple php scripts. The error is on the following line:

list($service_id, $ki3) = explode(',', $line,2);

Tried using the suggestion here: Undefined offset error on php when importing a CSV to no avail, and other on the site.

Any help with this would be most welcome.

回答1:

Since list() is attempting to assign two variables it is attempting to access two array elements [0] and [1]. Because there is no comma on the line, [1] does not exist.

Try some different functions:

$csv_data = file("data3_received.csv", FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);

foreach($csv_data as $line) {
    $data[] = str_getcsv($line);
}

To get individual variables you need to check if you have more than one column, or something similar:

if(count($data = str_getcsv($line)) > 1) {
    list($service_id, $ki3) = $data;
} else {
    $service_id = $data[0];
}