PHP - 数组中的数组中的数组，等等

Question

I'm working with a complicated Array and ultimately my goal is to get it into one simple array so I can insert each [record] into my database.

Given the complexity of the array, I can't wrap my head around how to flatten it out. I want to omit the [links] array and flatten out insert each [record] into the databse.

    Array
(
    [records] => Array
        (
            [0] => Array
                (
                    [links] => Array
                        (
                            [0] => Array
                                (
                                    [href] => linkgoeshere
                                    [rel] => self
                                )

                        )

                    [record] => Array
                        (
                            [id] => 8ca9df0a2dfc72f3983ffc55c1dd1b9f459ae2fa
                            [timestamp] => 2020-09-28T10:30:59.98Z
                            [size] => 825
                            [fields] => Array
                                (
                                    [projectdescription] => Description Goes Here
                                    [projectvalue] => 650000
                                    [applicant] => Applicant name
                                    [specificusecategory] => Category
                                    [issuedate] => 2020-09-01
                                    [propertyuse] => Array
                                        (etail Uses
                                            [0] => R
                                            [1] => Transportation and Storage Uses
                                        )

                                    [buildingcontractoraddress] => Address Here
                                    [buildingcontractor] => ABC Co
                                    [typeofwork] => ASDF
                                    [year] => 2020
                                    [permitnumber] => 123456
                                    [bi_id] => 123456
                                    [applicantaddress] => address 
                                    [address] => address
                                )

                        )

                )

        )

)

Answer 1

I currently cannot test, but I hope that there are no syntax errors here:

function flatten($source, &$target){ // could also use call by reference for source for better memory management, but not needed
  foreach(array_keys($source) as $key){ // inspect all keys on current array
    if(is_array($source[$key])){ // recursively call for sub-array
      flatten($source[$key], $target);
    }else{ // copy value to new array, maybe add more logic for duplicates here as this code just overrides them
      $target[$key] = $source[$key];
    }
  }
}

Call this code with $source being the input and $target being the output. As the output is used as call by reference all function calls access the same output array.

You may add further logic to eg exclude the link array as you wanted.

Full demo code showing how to flatten an array:

<?php 
// Include this go get more warnings etc.
ini_set('display_errors', '1');
ini_set('display_startup_errors', '1');
error_reporting(E_ALL);

function flatten($source, &$target){ // could also use call by reference for source for better memory management, but not needed
  foreach(array_keys($source) as $key){ // inspect all keys on current array
    if(is_array($source[$key])){ // recursively call for sub-array
      flatten($source[$key], $target);
    }else{ // copy value to new array, maybe add more logic for duplicates here as this code just overrides them
      $target[$key] = $source[$key];
    }
  }
}

$input =   Array( 0 => Array ("a" => 1, "b" => 2, "c" => 3), "hello" => "world", 2 => Array());

print_r($input);

$output = Array();

flatten($input, $output);

echo "<br />";

print_r($output);

This gives me the output:

Array ( [0] => Array ( [a] => 1 [b] => 2 [c] => 3 ) [hello] => world [2] => Array ( ) )
Array ( [a] => 1 [b] => 2 [c] => 3 [hello] => world )