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  1. <?php
  2.  
  3. /**
  4.  * Ideone usa uma versão antiga do php, mas basta usar a função abaixo
  5.  * que funciona exatamente igual a implementação do php 5.5
  6.  * 
  7.  * Basta dar um include da função abaixo no seu projeto
  8.  * https://g...content-available-to-author-only...b.com/ramsey/array_column 
  9.  * 
  10.  */
  11. if (!function_exists('array_column')) {
  12.     /**
  13.      * Returns the values from a single column of the input array, identified by
  14.      * the $columnKey.
  15.      *
  16.      * Optionally, you may provide an $indexKey to index the values in the returned
  17.      * array by the values from the $indexKey column in the input array.
  18.      *
  19.      * @param array $input A multi-dimensional array (record set) from which to pull
  20.      *                     a column of values.
  21.      * @param mixed $columnKey The column of values to return. This value may be the
  22.      *                         integer key of the column you wish to retrieve, or it
  23.      *                         may be the string key name for an associative array.
  24.      * @param mixed $indexKey (Optional.) The column to use as the index/keys for
  25.      *                        the returned array. This value may be the integer key
  26.      *                        of the column, or it may be the string key name.
  27.      * @return array
  28.      */
  29.     function array_column($input = null, $columnKey = null, $indexKey = null)
  30.     {
  31.         // Using func_get_args() in order to check for proper number of
  32.         // parameters and trigger errors exactly as the built-in array_column()
  33.         // does in PHP 5.5.
  34.         $argc = func_num_args();
  35.         $params = func_get_args();
  36.         if ($argc < 2) {
  37.             trigger_error("array_column() expects at least 2 parameters, {$argc} given", E_USER_WARNING);
  38.             return null;
  39.         }
  40.         if (!is_array($params[0])) {
  41.             trigger_error('array_column() expects parameter 1 to be array, ' . gettype($params[0]) . ' given', E_USER_WARNING);
  42.             return null;
  43.         }
  44.         if (!is_int($params[1])
  45.             && !is_float($params[1])
  46.             && !is_string($params[1])
  47.             && $params[1] !== null
  48.             && !(is_object($params[1]) && method_exists($params[1], '__toString'))
  49.         ) {
  50.             trigger_error('array_column(): The column key should be either a string or an integer', E_USER_WARNING);
  51.             return false;
  52.         }
  53.         if (isset($params[2])
  54.             && !is_int($params[2])
  55.             && !is_float($params[2])
  56.             && !is_string($params[2])
  57.             && !(is_object($params[2]) && method_exists($params[2], '__toString'))
  58.         ) {
  59.             trigger_error('array_column(): The index key should be either a string or an integer', E_USER_WARNING);
  60.             return false;
  61.         }
  62.         $paramsInput = $params[0];
  63.         $paramsColumnKey = ($params[1] !== null) ? (string) $params[1] : null;
  64.         $paramsIndexKey = null;
  65.         if (isset($params[2])) {
  66.             if (is_float($params[2]) || is_int($params[2])) {
  67.                 $paramsIndexKey = (int) $params[2];
  68.             } else {
  69.                 $paramsIndexKey = (string) $params[2];
  70.             }
  71.         }
  72.         $resultArray = array();
  73.         foreach ($paramsInput as $row) {
  74.             $key = $value = null;
  75.             $keySet = $valueSet = false;
  76.             if ($paramsIndexKey !== null && array_key_exists($paramsIndexKey, $row)) {
  77.                 $keySet = true;
  78.                 $key = (string) $row[$paramsIndexKey];
  79.             }
  80.             if ($paramsColumnKey === null) {
  81.                 $valueSet = true;
  82.                 $value = $row;
  83.             } elseif (is_array($row) && array_key_exists($paramsColumnKey, $row)) {
  84.                 $valueSet = true;
  85.                 $value = $row[$paramsColumnKey];
  86.             }
  87.             if ($valueSet) {
  88.                 if ($keySet) {
  89.                     $resultArray[$key] = $value;
  90.                 } else {
  91.                     $resultArray[] = $value;
  92.                 }
  93.             }
  94.         }
  95.         return $resultArray;
  96.     }
  97. }
  98.  
  99.     $array = [
  100.     	['nome' => 'Luis', 'id' => 31], 
  101.     	['nome' => 'Rui', 'id' => 42],
  102.     	['nome' => 'Joao', 'id' => 113],
  103.     	['nome' => 'Joaquim', 'id' => 434],
  104.     	['nome' => 'Jorge', 'id' => 503],
  105.     ];
  106.  
  107.     var_dump(array_column($array, 'nome'));
  108.  
  109.     // Se quiser, pode aproveitar uma segunda coluna para usar como key do novo array
  110.     var_dump(array_column($array, 'nome', 'id'));
Success #stdin #stdout 0.01s 20520KB
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array(5) {
  [0]=>
  string(4) "Luis"
  [1]=>
  string(3) "Rui"
  [2]=>
  string(4) "Joao"
  [3]=>
  string(7) "Joaquim"
  [4]=>
  string(5) "Jorge"
}
array(5) {
  [31]=>
  string(4) "Luis"
  [42]=>
  string(3) "Rui"
  [113]=>
  string(4) "Joao"
  [434]=>
  string(7) "Joaquim"
  [503]=>
  string(5) "Jorge"
}
https://ideone.com/On1KXq
language:
PHP (php 7.3.5)
created:
10 years ago
visibility:
public

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