PHP在连接键时将嵌套数组转换为单个数组? [英] PHP convert nested array to single array while concatenating keys?

问题描述

这是一个示例数组:

 $foo = array(
           'employer' => array(
                    'name' => 'Foobar Inc',
                    'phone' => '555-555-5555'
                     ),
           'employee' => array(
                    'name' => 'John Doe',
                    'phone' => '555-555-5556',
                    'address' => array(
                           'state' => 'California',
                           'zip' => '90210'
                        )
                    ),
           'modified' => '2009-12-01',
         );

我想得到这样的结果:

$fooCompressed = array(
             'employer_name' => 'Foobar Inc',
             'employer_phone' => '555-555-5555',
             'employee_name' => 'John Doe',
             'employee_phone' => '555-555-5556'
             'employee_address_state' => 'California',
             'employee_address_zip' => '90210',
             'modified' => '2009-12-01'
             )

我将如何编写递归函数来处理这个问题?

How would I go about writing a recursive function to handle this?

推荐答案

是这样的:

function makeNonNestedRecursive(array &$out, $key, array $in){
    foreach($in as $k=>$v){
        if(is_array($v)){
            makeNonNestedRecursive($out, $key . $k . '_', $v);
        }else{
            $out[$key . $k] = $v;
        }
    }
}

function makeNonNested(array $in){
    $out = array();
    makeNonNestedRecursive($out, '', $in);
    return $out;
}

// Example
$fooCompressed = makeNonNested($foo);

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