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<?php // Test for array_column // available since PHP >= 5.5.0 !! // php.net/manual/function.array-column.php $foo = ARRAY(); $foo[0] = ARRAY('key'=>'key0', 'value'=>'value0', 'text'=>'text0', 'int'=>1000); $foo[1] = ARRAY('key'=>'key1', 'value'=>'value1', 'text'=>'text1', 'int'=>1001); $foo[2] = ARRAY('key'=>'key2', 'value'=>'value2', 'text'=>'text2', 'int'=>1002); $foo[3] = ARRAY('key'=>'key3', 'value'=>'value3', 'text'=>'text3', 'int'=>1003); $foo[5] = ARRAY('key'=>'key5', 'value'=>'value5', 'text'=>'text5', 'int'=>1005); $foo[7] = ARRAY('key'=>'key7', 'value'=>'value7', 'text'=>'text7', 'int'=>1007); // reset indexes, set column 'value' as values $result1 = array_column($foo, 'value'); var_export($result1); print "\n\n"; // re-index with column 'key', use column 'value' as values $result2 = array_column($foo, 'value', 'key'); var_export($result2); print "\n\n"; // re-index with column 'int', use column 'value' as values $result3 = array_column($foo, 'value', 'int'); var_export($result3); print "\n\n"; // re-index with column 'int', use COMPLETE ARRAY as values $result4 = array_column($foo, NULL, 'int'); var_export($result4); print "\n\n"; // => Warning: array_column() expects at least 2 parameters, 1 given ... $result101 = array_column(NULL); var_export($result101); print "\n\n"; // => Warning: array_column() expects at least 2 parameters, 1 given ... $result102 = array_column(FALSE); var_export($result102); print "\n\n"; // => Warning: array_column() expects at least 2 parameters, 1 given ... $result103 = array_column('bla'); var_export($result103); print "\n\n"; <?php /** * This file is part of the array_column library * * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. * * @copyright Copyright (c) 2013 Ben Ramsey <http://benramsey.com> * @license http://opensource.org/licenses/MIT MIT */ if (!function_exists('array_column')) { /** * Returns the values from a single column of the input array, identified by * the $columnKey. * * Optionally, you may provide an $indexKey to index the values in the returned * array by the values from the $indexKey column in the input array. * * @param array $input A multi-dimensional array (record set) from which to pull * a column of values. * @param mixed $columnKey The column of values to return. This value may be the * integer key of the column you wish to retrieve, or it * may be the string key name for an associative array. * @param mixed $indexKey (Optional.) The column to use as the index/keys for * the returned array. This value may be the integer key * of the column, or it may be the string key name. * @return array */ function array_column($input = null, $columnKey = null, $indexKey = null) { // Using func_get_args() in order to check for proper number of // parameters and trigger errors exactly as the built-in array_column() // does in PHP 5.5. $argc = func_num_args(); $params = func_get_args(); if ($argc < 2) { trigger_error("array_column() expects at least 2 parameters, {$argc} given", E_USER_WARNING); return null; } if (!is_array($params[0])) { trigger_error('array_column() expects parameter 1 to be array, ' . gettype($params[0]) . ' given', E_USER_WARNING); return null; } if (!is_int($params[1]) && !is_float($params[1]) && !is_string($params[1]) && $params[1] !== null && !(is_object($params[1]) && method_exists($params[1], '__toString')) ) { trigger_error('array_column(): The column key should be either a string or an integer', E_USER_WARNING); return false; } if (isset($params[2]) && !is_int($params[2]) && !is_float($params[2]) && !is_string($params[2]) && !(is_object($params[2]) && method_exists($params[2], '__toString')) ) { trigger_error('array_column(): The index key should be either a string or an integer', E_USER_WARNING); return false; } $paramsInput = $params[0]; $paramsColumnKey = ($params[1] !== null) ? (string) $params[1] : null; $paramsIndexKey = null; if (isset($params[2])) { if (is_float($params[2]) || is_int($params[2])) { $paramsIndexKey = (int) $params[2]; } else { $paramsIndexKey = (string) $params[2]; } } $resultArray = array(); foreach ($paramsInput as $row) { $key = $value = null; $keySet = $valueSet = false; if ($paramsIndexKey !== null && array_key_exists($paramsIndexKey, $row)) { $keySet = true; $key = (string) $row[$paramsIndexKey]; } if ($paramsColumnKey === null) { $valueSet = true; $value = $row; } elseif (is_array($row) && array_key_exists($paramsColumnKey, $row)) { $valueSet = true; $value = $row[$paramsColumnKey]; } if ($valueSet) { if ($keySet) { $resultArray[$key] = $value; } else { $resultArray[] = $value; } } } return $resultArray; } } ?>