get key of multi dimension array (PHP Language) - php

Question

Hi I have a problem regarding multi-dimension array. I have a set of array looking like this
array:3 [▼
0 => array:1 [▼
"tree" => "0"
]
1 => array:1 [▼
"tree" => "2"
]
2 => array:1 [▼
"tree" => "0"
]
]
the array is from
dd($this->treeArray);
how do I want to get the array which the value is 0. Expected result/filter
For example:
array:2 [▼
0 => array:1 [▼
"tree" => "0"
]
1 => array:1 [▼
"tree" => "0"
]
]
or
array:1 [▼
0 => array:1 [▼
"tree" => "2"
]
]
if changing the index is impossible, its ok..
Thank you

Answer 1

As you are using Laravel, you could use array helper such as this
You can use like this:
use Illuminate\Support\Arr;
$newTreeArray = Arr::where($this->treeArray, function ($tree) => $tree['tree'] === "0");

Answer 2

do you want in_array()?
$arraysContainingZero=[];
foreach($this->treeArray as $wutkey => $wut){
if(in_array("0", $wut, true)){
$arraysContainingZero[$wutkey] = $wut;
}
}
var_dump($arraysContainingZero);

Answer 3

There are a lots of build in function in PHP that is useful for operating on an array. You can see the full list here: https://www.php.net/manual/en/ref.array.php
One of the function is called array_filter (https://www.php.net/manual/en/function.array-filter.php). The function iterates over each value in the array passing them to the callback function. If the callback function returns true, the current value from array is returned into the result array.
So in your case, you want to call the array_filter with a callback that return true if the value is 0. Example:
$input = [
[ 'tree' => 1 ],
[ 'tree' => 0 ],
[ 'tree' => 0 ],
];
$output = array_filter($input, function($arr) {
return $arr['tree'] === 0;
});
var_dump($output);
// result
array(2) {
[1]=>
array(1) {
["tree"]=>
int(0)
}
[2]=>
array(1) {
["tree"]=>
int(0)
}
}