How do I add a key to each array in a multidimensional array if it meets certain criteria in php?

问题

Lets say I have an array like:

$thing = Array
(
    [test1] => something
    [test2] => something
    [info] => yes
    [array] => Array
        (
            [test1] => something else
            [test2] => something else
            [info] => maybe
            [array] => Array
                (
                    [test1] => something
                    [info] => yes
                )

        )
)

How can I write a function that goes through $thing and adds a key to each part called 'valid' with a value of TRUE if the value of 'info' is 'yes' and FALSE otherwise?

I basically want the final array to look like:

$final = Array
(
    [test1] => something
    [test2] => something
    [info] => yes
    [valid] => TRUE //add this
    [array] => Array
        (
            [test1] => something else
            [test2] => something else
            [info] => maybe
            [valid] => FALSE //add this
            [array] => Array
                (
                    [test1] => something
                    [info] => yes
                    [valid] => TRUE //add this
                )

        )

)

I'm writing a library for codeigniter that manages a site map and provides easy ways to get the breadcrumb and navigation tree for a page but am stuck at a part where I need to do something like this.

The main question that I can't figure out is: How do I go through the array and add a key to each part? Also there can be an infinite amount of arrays in arrays.

Thanks!

回答1:

You can use this

$thing = Array
(
        "test1" => "something",
        "test2" => "something",
        "info" => "yes",
        "array" => Array
        (
                "test1" => "something else",
    "test2" => "something else",
    "info" => "maybe",
                "array" => Array
                (
                        "test1" => "something",
                        "info" => "yes"
                )
        )
);



function validPush($array)
{
    foreach ($array as $key => $value)
    {
        if(is_array($value))
           $array[$key] = validPush($value);

        if($key == "info")
            $array['valid'] = ($value == "yes") ? true : false ;
    }
    return $array;
}

var_dump(validPush($thing));

Output

array
  'test1' => string 'something' (length=9)
  'test2' => string 'something' (length=9)
  'info' => string 'yes' (length=3)
  'array' => 
    array
      'test1' => string 'something else' (length=14)
      'test2' => string 'something else' (length=14)
      'info' => string 'maybe' (length=5)
      'array' => 
        array
          'test1' => string 'something' (length=9)
          'info' => string 'yes' (length=3)
          'valid' => boolean true
      'valid' => boolean false
  'valid' => boolean true

回答2:

This feels like you're adding redundant information. Why can't you just re-use the data in the array - i.e.

[info] => yes

回答3:

function setInfoTrueFalse($array){
    if(isset($array['info']) && $array['info']=='yes'){ 
        $array['valid']=TRUE;
    }else{
        $array['valid']=FALSE;
    }
    foreach($array as $key => $val){ # if we don't know the name of possible arrays, loop though
        if(is_array($val)){
            # loop one layer deeper if we have another array, could combine with the 'info' check if yes to that means this array exists and is an array
            $array[$key]=setInfoTrueFalse($array[$key]);
        }
    }
    return $array;
}

$final=setInfoTrueFalse($thing);

回答4:

why not jus add the value to the first array and consider it valid for the rest.

edit: do a recursive call, passing $array depending on how many dimensional array you got, here 3.

function add_array( $array) {  
    $array['info'] = 'yes';
 return $arr;
}

call:

 $final = add_array(add_array(add_array($final)));

来源：https://stackoverflow.com/questions/12516874/how-do-i-add-a-key-to-each-array-in-a-multidimensional-array-if-it-meets-certain

标签

php

arrays

multidimensional-array

foreach

nested-loops