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@ 2014-01-13T16:55:05Z

<?php

class A1 {
    public function rows() {
        $a = array();
        $a[] = array('parent_id' => 0, 'category_id' => 7);
        $a[] = array('parent_id' => 0, 'category_id' => 8);
        $a[] = array('parent_id' => 0, 'category_id' => 9);
        $a[] = array('parent_id' => 7, 'category_id' => 10);
        $a[] = array('parent_id' => 7, 'category_id' => 11);
        $a[] = array('parent_id' => 8, 'category_id' => 12);
        $a[] = array('parent_id' => 10, 'category_id' => 13);

        return $a;
    }
}

$query = new A1;
$categoryArray = array();

foreach($query->rows() as $row) {
    if(isset($categoryArray[$row['category_id']])) {
        $categoryArray[$row['parent_id']] = $row['category_id'];
    } else {
        $categoryArray[$row['parent_id']][$row['category_id']] = $row['name'];
    }
}

print_r($categoryArray);

Output for git.master, git.master_jit, rfc.property-hooks: Warning: Undefined array key "name" in /in/9hhFO on line 25 Warning: Undefined array key "name" in /in/9hhFO on line 25 Warning: Undefined array key "name" in /in/9hhFO on line 25 Warning: Undefined array key "name" in /in/9hhFO on line 25 Warning: Undefined array key "name" in /in/9hhFO on line 25 Warning: Undefined array key "name" in /in/9hhFO on line 25 Warning: Undefined array key "name" in /in/9hhFO on line 25 Array ( [0] => Array ( [7] => [8] => [9] => ) [7] => Array ( [10] => [11] => ) [8] => Array ( [12] => ) [10] => Array ( [13] => ) )

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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