Converting JSON to CSV format using PHP

问题:

I am trying to convert a json file into csv format using a php script. The code is as follows:

if (empty($argv[1])) die("The json file name or URL is missed\n"); $jsonFilename = $argv[1];  $json = file_get_contents($jsonFilename); $array = json_decode($json, true); $f = fopen('output.csv', 'w');  $firstLineKeys = false; foreach ($array as $line) {     if (empty($firstLineKeys))     {             $firstLineKeys = array_keys($line);             fputcsv($f, $firstLineKeys);             $firstLineKeys = array_flip($firstLineKeys);     }  fputcsv($f, array_merge($firstLineKeys, $line)); 

}

This kind of works, but is only returning the outer variables of the JSON file, and am getting a "Array to string conversion" warning

The JSON data looks like this:

{"type":"NON_ATTRIBUTED","conversion":{,"value_1":"000000100355321","value_3":"XXXX","value_4":"12667","value_5":"6"},"stream_type":"COOKIE"} {"type":"ATTRIBUTED","conversion":{,"value_1":"000000167865321","value_3":"YYYY","value_4":"12668","value_5":"0"},"stream_type":"COOKIE"} {"type":"NON_ATTRIBUTED","conversion":{,"value_1":"000000134535321","value_3":"AAAA","value_4":"12669","value_5":"9"},"stream_type":"COOKIE"} {"type":"NON_ATTRIBUTED","conversion":{,"value_1":"000000100357651","value_3":"WWWW","value_4":"12670","value_5":"2"},"stream_type":"COOKIE"} 

The output I am getting is : type,conversion,stream_type NON_ATTRIBUTED,Array,COOKIE NON_ATTRIBUTED,Array,COOKIE

The output I am expecting is: type,conversion,value_1,value_3,value_4, value_5 ,stream_type NON_ATTRIBUTED,000000100355321, XXXX, 1267, 6, COOKIE ..

ANy help appreciated as this is very new to me

回答1:

json_decode($json, true); converts JSON objects to associative arrays. So this

{     "type":"NON_ATTRIBUTED",     "conversion":{,         "value_1":"000000100355321",         "value_3":"XXXX",         "value_4":"12667",         "value_5":"6"     },     "stream_type":"COOKIE" } 

Become this:

array(3) {      ["type"]=> string(14) "NON_ATTRIBUTED"      ["conversion"]=> array(4) {          ["value_1"]=> string(15) "000000100355321"          ["value_3"]=> string(4) "XXXX"          ["value_4"]=> string(5) "12667"          ["value_5"]=> string(1) "6"      }      ["stream_type"]=> string(6) "COOKIE"  } 

As you see there is nested arrays. And you trying to insert all elements of array to your text file (csv is just a simple text file) with this line:

fputcsv($f, array_merge($firstLineKeys, $line)); 

It works nice when element of array is string. But when the element is array we got the Array to string conversion. So you must to use loop or array_merge on a nested array to prevent this.

I can't clearly understand how your csv must look like, but I hope this fix of your code will help you. If not, write a comment below.

if (empty($argv[1])) die("The json file name or URL is missed\n"); $jsonFilename = $argv[1];  $json = file_get_contents($jsonFilename); $array = json_decode($json, true); $f = fopen('output.csv', 'w');  $firstLineKeys = false; foreach ($array as $line) {     if (empty($firstLineKeys))     {         $firstLineKeys = array_keys($line);         fputcsv($f, $firstLineKeys);         $firstLineKeys = array_flip($firstLineKeys);     }     $line_array = array($line['type']);     foreach ($line['conversion'] as $value)     {         array_push($line_array,$value);     }     array_push($line_array,$line['stream_type']);     fputcsv($f, $line_array);  } 

There is also a mistake in your json - unneeded comma: "conversion":{,

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