基于 if 的过滤器数组包含 php

Question

My aim here is to remove the whole object from the array if "record_type" is null. I should then only be left with data that has a record_type set in the array.

I've looked into the array filter not sure how I target the data within the array "record_type". My only other thought is to import to a database and then SQL query what I want then delete data I've had which is much more overkill.

<pre>


array:36 [▼
  0 => array:3 [▼
    "type" => "comment"
    "line_index" => 0
    "text_b64" => "OyBjUGFuZWwgZmlyc3Q6ODguMC4xMiAodXBkYXRlX3RpbWUpOjE2MTg1NDYxNDIgQ3BhbmVsOjpab25lRmlsZTo6VkVSU0lPTjoxLjMgaG9zdG5hbWU6cjExOC5sb24yLm15c2VjdXJlY2xvdWRob3N0LmNvbSBs ▶"
  ]
  1 => array:3 [▼
    "line_index" => 1
    "text_b64" => "OyBab25lIGZpbGUgZm9yIG9ha3RyZWVkZW50YWxtb3J0aW1lci5jby51aw=="
    "type" => "comment"
  ]
  2 => array:3 [▼
    "text_b64" => "JFRUTCAxNDQwMA=="
    "line_index" => 2
    "type" => "control"
  ]
  3 => array:6 [▼
    "line_index" => 3
    "dname_b64" => "b2FrdHJlZWRlbnRhbG1vcnRpbWVyLmNvLnVrLg=="
    "record_type" => "SOA"
    "ttl" => 30
    "type" => "record"
    "data_b64" => array:7 [▶]
  ]
  4 => array:6 [▼
    "dname_b64" => "b2FrdHJlZWRlbnRhbG1vcnRpbWVyLmNvLnVrLg=="
    "line_index" => 10
    "record_type" => "NS"
    "ttl" => 30
    "type" => "record"
    "data_b64" => array:1 [▶]
  ]
  5 => array:6 [▼
    "ttl" => 30
    "dname_b64" => "b2FrdHJlZWRlbnRhbG1vcnRpbWVyLmNvLnVrLg=="
    "line_index" => 11
    "record_type" => "NS"
    "data_b64" => array:1 [▶]
    "type" => "record"
  ]
</pre>

Answer 1

Goal: only be left with data that has a 'record_type' set (not null ) in the array

Solution: use array_filter() on your source array ( $arr ) and filter for records with 'record_type' != "NS" (assuming "NS" is what you refer to as null , or not set).

<?php
$result = array_filter(
    $arr,
    function (array $record) {
        if (isset($record['record_type'])) {
            return $record['record_type'] != "NS";
        } return null;
    }
);

working demo

EDIT

If you want to filter for only those records that are of a certain type, eg type 'record', following should help:

<?php
$result = array_filter(
    $arr,
    function (array $record) {
        if ($record['type'] == 'record') {
            return true;
        } return false;
    }
);

working demo

Answer 2

If your Goal is to filter array to remove any inner-array that hasn't a record_type , So use array_filter with a callback function fn to check that record_type exist with isset function.

array_filter($arr, fn($el)=>isset($el["record_type"]));