Question

I need to get a count of the first column’s values. These ID’s might or might not exist in any given .csv file I receive. So I need to loop through the .csv file looking at the first column and either adding it to a holding array ($PWSs) if it doesn’t exist or incrementing the count in this holding array if I’ve already added it.

I have the first loop using fgetcsv()..this works for cracking into the file:

$PWSs = array();

$handle2 = fopen ($uploadfileandpath,"r");
while ($field2array = fgetcsv ($handle2, 130000, ",")) 
{
    // Here is where I would add value or increment $PWSs array
    while (?)
    {
        if ($field2array[0] != ?)
        {
            // Add or increment
        }
    }
}

Here is actual data. The first column has IDs for Public Water Systems. I need to count them.

"00513","08/13/2009","090834311A","R","4","OR1000x6","N","N","E",,1,".73","COLILERT"
"00513","08/13/2009","090834312A","R","39","OR1000x6","N","N","E",,1,".35","COLILERT"
"00154","08/13/2009","090835401A","R","300 Falls Road","OR100016","N","N","E",,1,".10","COLILERT"
"95343","08/13/2009","090835601A","R","Room 1 Sink","OR1000x6","N","N","E",,1,,"COLILERT"
"94585","08/14/2009","090837701A","R","Kitchen","OR1000x6","N","N","E",,1,,"COLILERT"
"94704","08/14/2009","090837801A","R","Outside Tap","OR1000x6","N","N","E",,1,,"COLILERT"
"01430","08/14/2009","090838201A","R","100 Deer Park Ln OT","OR1000x6","N","N","E",,1,,"COLILERT"
"00625","08/14/2009","090839001A","R","Dano and N Rose","OR100016","N","N","E",,1,".35","COLILERT"
"00405","08/17/2009","090840301A","R","Westmont Drive","OR100016","N","N","E",,1,".28","COLILERT"
"01031","08/17/2009","090840401A","R","Unit 2 Faucet","OR100016","N","N","E",,1,,"COLILERT"
"00625","08/17/2009","090840601A","R","Luman Road","OR1000x6","N","N","E",,1,".35","COLILERT"
"00513","08/17/2009","090841001A","R","40","OR1000x6","N","N","E",,1,".18","COLILERT"
"00513","08/17/2009","090841002A","R","10","OR1000x6","N","N","E",,1,".16","COLILERT"

Answer 1

$fh = fopen('file.csv', 'rb');

$PWS = array();
while($row = fgetcsv($fh)) {
    $PWS[$row[0]]++;
}

Basically it’ll populate the PWS using the first column values as keys, and increment them as they come along. Afterwards, given your sample csv above, you’d end up with

$PWS = array(
    '00513' => 4
    '00154' => 1
    '95343' => 1
    '94585' => 1
etc...
);