Using array param in array_walk callback

Question

I have a CSV file. The first line contains header information.

Below is an excerpt of the file (comments added).

Name, City, State, Country // header line Tom, Jackson, Mississippi, United States // line 1 Simon, Temple, Pennsylvania, United States // line 2... etc...

I'm parsing this CSV into an array using array_map:

// parse CSV file into an array $fileArray = array_map('str_getcsv', file($file["tmp_name"]));

Which gives me the following:

array(3) { [0] => array(4) { [0] => string(4) "Name" [1]=> string(4) "City" [2]=> string(5) "State" [3]=> string(6) "Country" } [1] => array(4) { [0] => string(4) "Tom" [1]=> string(7) "Jackson" [2]=> string(11) "Mississippi" [3]=> string(13) "United States" } [2] => array(4) { [0] => string(5) "Simon" [1]=> string(6) "Temple" [2]=> string(12) "Pennsylvania" [3]=> string(13) "United States" }

I'm trying to remap the array to key/value pairs, so that the key will reference the appropriate header field. So for example:

array(3) { [0] => array(4) { ['Name'] => string(4) "Name" ['City']=> string(4) "City" ['State']=> string(5) "State" ['Country']=> string(6) "Country" } [1] => array(4) { ['Name'] => string(4) "Tom" ['City']=> string(7) "Jackson" ['State']=> string(11) "Mississippi" ['Country']=> string(13) "United States" } [2] => array(4) { ['Name'] => string(5) "Simon" ['City']=> string(6) "Temple" ['State']=> string(12) "Pennsylvania" ['Country']=> string(13) "United States" }

I'm using array_walk to alter the array with a callback function, but it appears that array_walk is having problems processing an array as the 3rd argument.

// parse CSV file into an array $fileArray = array_map('str_getcsv', file($file["tmp_name"])); // header line $header = $fileArray[0]; // header[0] = "[0]=>Name, [1]=>City... etc" /* alterArray * Update the array to key/value */ function alterArray(&$item, $key, $prefix) { $item = "${prefix}[${key}]}: ${item}"; } // use array_walks to array_walk($fileArray, 'alterArray', $header); // print result print_r($fileArray);

I'm getting this error:

Notice: Array to string conversion

Matthew · Accepted Answer · 2016-08-07 07:37:39Z

Each item in alterArray is an array, and you obviously try to cast it to string, which throws the error (just var_dump $item in alterArray to see it for yourself). What you want:

function alterArray(&$item, $key, $header) { $item = array_combine($header, $item); } array_walk($fileArray, 'alterArray', $header);

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