PHP - Update specific row in CSV file

Question

Is there an effective way to update/delete specific row in CSV file? Every other method included reading contents of entire file, creating temporary file and then replacing

Answer 1

Consider reading the csv line by line into a multi-dimensional array, and at a certain row make your changes. Then, export array data out to csv. Below example modifies the 100th row assuming a 6-column comma delimited csv file (0-5).

Now, if you want to delete the row, then exclude it from $newdata array by conditionally skipping to next loop iteration with continue. Alternatively, if you want to update, simple set current inner array $newdata[$i] to new values:

$i = 0;
$newdata = [];
$handle = fopen("OldFile.csv", "r");

// READ CSV
while (($data = fgetcsv($handle, 1000, ",")) !== FALSE) {      

    // UPDATE 100TH ROW DATA (TO EXCLUDE, KEEP ONLY $i++ AND continue)
    if ($i == 99) {
        $newdata[$i][] = somenewvalue;          
        $newdata[$i][] = somenewvalue;   
        $newdata[$i][] = somenewvalue;  
        $newdata[$i][] = somenewvalue;
        $newdata[$i][] = somenewvalue;
        $newdata[$i][] = somenewvalue;
        $i++;
        continue;
    }  
    $newdata[$i][] = $data[0];          
    $newdata[$i][] = $data[1];    
    $newdata[$i][] = $data[2];      
    $newdata[$i][] = $data[3];    
    $newdata[$i][] = $data[4];    
    $newdata[$i][] = $data[5];
    $i++;    
}

// EXPORT CSV
$fp = fopen('NewFile.csv', 'w');    
foreach ($newdata as $rows) {
    fputcsv($fp, $rows);
}    
fclose($fp);