PHP loop in for loop

Question

I want to make venue_ to running in loop together with the venueName. But seem it only display the last venue_ result. Any idea what wrong with my code?

$venueLength = 6;

for ($i = 0; $i < $venueLength; $i++) {
  $linkageArray = array();

  $mainArray = array ("venueName" => $venueArray[$i]['venueName']);

  for ($j = 0; $j < $venueLength; $j++) {
    $secondArray = array ( "venue_".$j => (in_array($venueArray[$j]['venueID'], $linkageArray) ? 'X' : ''));
  }

  $res[] = array_merge($mainArray, $secondArray); 
}   
header("Content-type: application/json");
$result = json_encode($res);
echo $result;

Outcome

[
  {
    venueName: "Data A",
    venue_5: ""
  },
  {
    venueName: "Data A3",
    venue_5: ""
  },
  {
  ........
]

Result I want

[
  {
    venueName: "Data A",
    venue_0: "",
    venue_1: "",
    venue_2: "",
    venue_3: "",
    venue_4: "",
    venue_5: ""
  },
  {
    venueName: "Data A3",
    venue_0: "",
    venue_1: "",
    venue_2: "",
    venue_3: "",
    venue_4: "",
    venue_5: ""
  },
  ........
]

$secondArray = array... overwriting $secondArray with every loop iteration. Last one wins. — user8034901
– user8034901, Commented Mar 19, 2020 at 7:41

Nigel Ren · Accepted Answer · 2020-03-19 07:42:36Z

2

You just keep on resetting the $secondArray value in

$secondArray = array ( "venue_".$j => (in_array($venueArray[$j]['venueID'], $linkageArray) ? 'X' : ''));

instead reset the array outside the loop and add a new value for each loop...

  $secondArray = [];
  for ($j = 0; $j < $venueLength; $j++) {
      $secondArray[ "venue_".$j ] = (in_array($venueArray[$j]['venueID'], $linkageArray) ? 'X' : ''));
  }

or just add it directly into $mainArray

  for ($j = 0; $j < $venueLength; $j++) {
      $mainArray[ "venue_".$j ] = (in_array($venueArray[$j]['venueID'], $linkageArray) ? 'X' : ''));
  }

and you don't need the array_merge().

answered Mar 19, 2020 at 7:42

Nigel Ren

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2 Comments

dontbannedmeagain Over a year ago

I try to add directly into $mainArray like you said but still not working? it get last venueName instead entire venueName's Example

Nigel Ren Over a year ago

Do you add the data using $res[] = $mainArray; ?

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