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@ 2015-03-19T10:08:43Z

<?php
    function transfer( $arr, $prefix=array(), $glue="_" ) {
        $res = array();
        foreach( $arr as $key => $val ) {
            $key = array_merge( $prefix, array($key) );
            if( is_array($val) ) $res = array_merge( $res, transfer( $val, $key, $glue ) );
            else $res[ implode($glue, $key) ] = $val;
        }
        return $res;
    }
    
    
    $attributes = array(
        'Users' => array(
            'Name' => 'Name',
        ),
        'Address' => 'Address',
        'Tags' => array(
            0 => array(
                'Key' => 'Key',
                'Value' => 'Value',
            ),
            1 => array(
                'Key' => 'Key',
            ),
            2 => array(
            )
        ),
    );
    var_dump( transfer( $attributes ) );

Output for git.master, git.master_jit, rfc.property-hooks: array(5) { ["Users_Name"]=> string(4) "Name" ["Address"]=> string(7) "Address" ["Tags_0_Key"]=> string(3) "Key" ["Tags_0_Value"]=> string(5) "Value" ["Tags_1_Key"]=> string(3) "Key" }

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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