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Thread: parsing selected non sequential columns from csv

  1. #1
    Join Date
    Oct 2015
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    3

    parsing selected non sequential columns from csv

    I am very newbie to php.I am upto parse the csv file and want to copy selected columns to other csv file, which are not sequential. I have read data from csv file in multidimentional array. so I have all key value pairs, where keys are name of columns and values are the data from csv file. I am using

    foreach($contents as $line) {
    $line = preg_replace( "/\r|\n/", "", $line );
    $line_array = explode(",",$line);
    if($i==0)
    {
    foreach($line_array as $key=>$val)
    {
    $csv_heading[$key] = trim($val);
    }
    }
    else
    {
    foreach($line_array as $key=>$val)
    {
    $csv_array[$i][$csv_heading[$key]] = $val;
    }
    }
    $i++;
    }
    $len = count($csv_array);
    $row = array();
    for($col = 0 ; $col < $len ; $col++)
    {
    if(array_intersect_key($col , $picked))
    $row[] = $csv_array[$col];
    $final = $row;
    print_r($row);
    }

    and my csv file contains records like

    name,city,state,country
    Dave,mumbai,maharashtra,India

    and so on. from the csv file I want to copy the columns name and city to other csv. can anyone help me? Thanks in advance.

  2. #2
    Join Date
    Oct 2015
    Posts
    3
    No help??

  3. #3
    Join Date
    Jul 2013
    Location
    Voorheesville NY USA
    Posts
    1,501
    Not a very clear explanation of your dilemma. Have to wonder why one would want to move data from one csv file to another one instead of making a more-usable database table out of it.

    Am I understanding you in that your csv is a set of column names and their values? That is what it appears to be, which is an unusual csv format.

    Perhaps you could post a sample of ONE row of your csv and ONE row of your desired csv files, IF that is really your best alternative.
    JG
    PS - If you're posting here you should be using:

    error_reporting(E_ALL);
    ini_set('display_errors', '1');


    at the top of ALL php code while you develop it!

  4. #4
    Join Date
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    Ankh-Morpork
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    It would be simpler and more memory efficient (PHP arrays are memory hogs) to just read from one file and write to the other, line by line:
    PHP Code:
    $fhIn fopen('path/to/source_file.csv''r');
    $fhOut fopen('path/to/output.csv''w'); // should do some error-checking for both of these!

    while(($row fgetcsv($fhIn)) != false) {
        
    fputcsv($fhOutarray_slice($row(02));
    }

    fclose($fhIn);
    fclose($fhOut); 
    "Please give us a simple answer, so that we don't have to think, because if we think, we might find answers that don't fit the way we want the world to be."
    ~ Terry Pratchett in Nation

    How to Ask Questions the Smart Way (not affiliated with this site, but well worth reading)

  5. #5
    Join Date
    Oct 2015
    Posts
    3
    thanx for ur reply @ginerjm.
    I have requirment dat is only why i want to copy in diff csv.


    thanx for ur reply @NogDog.
    but array_slice works horizontly.not vertically.I want columns to be copied.

  6. #6
    Join Date
    Jul 2013
    Location
    Voorheesville NY USA
    Posts
    1,501
    Good luck with this cause you're not making much sense.
    JG
    PS - If you're posting here you should be using:

    error_reporting(E_ALL);
    ini_set('display_errors', '1');


    at the top of ALL php code while you develop it!

  7. #7
    Join Date
    Aug 2004
    Location
    Ankh-Morpork
    Posts
    21,162
    Quote Originally Posted by newbiePHP View Post
    thanx for ur reply @ginerjm.
    I have requirment dat is only why i want to copy in diff csv.


    thanx for ur reply @NogDog.
    but array_slice works horizontly.not vertically.I want columns to be copied.
    Afraid I don't understand what you're trying to do, then (or I do, but you don't understand my code ). What I suggested would read this:
    Code:
    11,12,13,14
    21,22,23,24
    31,32,33,34
    ...and output this:
    Code:
    11,12
    21,22
    31,32
    If it should do something else, then it might help to provide a similarly brief example of input and expected output.
    "Please give us a simple answer, so that we don't have to think, because if we think, we might find answers that don't fit the way we want the world to be."
    ~ Terry Pratchett in Nation

    How to Ask Questions the Smart Way (not affiliated with this site, but well worth reading)

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