如果唯一，如何在数组中存储值

Question

I'm writing a PHP report which is designed to be exported purely as a CSV file, using commma delimiters.

There are three columns relating to product_id, these three columns are as follows:

SKU                Parent / Child      Parent SKU
12345                  parent             12345
12345_1                child              12345
12345_2                child              12345
12345_3                child              12345
12345_4                child              12345
18099                  parent             18099
18099_1                child              18099

At the moment the code looks like this:

<?php

    $con_size = array (35,355,36,37,375,38,385,39,395,40,405,41,415,42,425,43,435,44,445,45,455,46,465,47,475,48,485);
    $arrlength=count($con_size);

    for($x=0;$x<$arrlength;$x++) {

    // check if size is available
    if($line['quantity_c_size_'.$con_size[$x].'_chain'] > 0 ) {

      ?>

        <? echo 'Shoes'; ?>,
        <?=$line['product_id']?>,
        ,
        ,

So at the moment this is simply echoing out the product_ID into the SKU column. How would I create an array which tests whether the 'product_id' is unique and if not suffixes the ID with _1, _2, etc.

Thanks,

Answer 1

Test whether it's in the array, and add it if it's not.

if (!in_array($line['product_id'], $SKU)) {
    $SKU[] = $line['product_id'];
    echo $line['product_id'];
} else {
    echo $line['product_id'] . "_1";
}

If you need the suffixes to increment each time, you can do:

$SKU_counters = array();
if (isset($SKU_counters[$line['product_id']])) {
    echo $line['product_id'] . "_" . $SKU_counters[$line['product_id']]++;
} else {
    echo $line['product_id'];
    $SKU_counters[$line['product_id']] = 1;
}

At the end of the loop you do:

$SKU = array_keys($SKU_counters);