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@ 2018-07-17T00:16:17Z

<?php
$csv = [
    ['s1','n1','description 1', 'Helmets'],
    ['s1','n1','description 1a', 'Helmets'],
    
    ['s2','n1','description 2', 'Gloves'],
    ['s2','n1','description 2a', 'Gloves'],
];

$catMap = [
    'Helmets' => 30,
    'Gloves' => 20,
    ];
    
$result = [];
foreach($csv as $row){
    //#1 trimming:
    $row = array_map('trim', $row);        
    
    $row = [
        'SKU' => $row[0],
        'Product_Name' => $row[1],
        'Description' => $row[2],
        'Category_ID' => $row[3],
        ];    

    $sku = $row['SKU'];
    
    //#2 cat remapping
    assert(isset($catMap[$row['Category_ID']]));
    $row['Category_ID'] = $catMap[$row['Category_ID']];
    
    //#3 combining
    if(isset($result[$sku])){
        $result[$sku]['Description'] .= ' ' . $row['Description'];
    }else{
        $result[$sku] = $row;
    }
};

var_dump($result);

Output for git.master_jit, git.master, rfc.property-hooks: array(2) { ["s1"]=> array(4) { ["SKU"]=> string(2) "s1" ["Product_Name"]=> string(2) "n1" ["Description"]=> string(28) "description 1 description 1a" ["Category_ID"]=> int(30) } ["s2"]=> array(4) { ["SKU"]=> string(2) "s2" ["Product_Name"]=> string(2) "n1" ["Description"]=> string(28) "description 2 description 2a" ["Category_ID"]=> int(20) } }

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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