PHP Array Filtering issues

Hypothetical array
Array (0 + = array (' catid ' = ' = ' Parent ' = ' 1 '), 1 = = Array (' catid ' + = = ' Parent ' = 1), Array (' C Atid ' = +, ' parent ' = 2);

I want to keep only the value of parent 2 What do I do?
New brother hope the hero help thank you!

Reply to discussion (solution)

$a = array (' catid ' = ' = ', ' parent ' = ' 1 '), 1 = = Array (' catid ' + = = ' Parent ' = 1), arr Ay (' catid ', ' parent ' = 2)); $t = Array_map (function ($v) {return Array (' parent ' = = $v [' parent ']);}, $a); /*php 5.2.x Writing $t = Array_map (create_function (' $v ', ' Return array ' ("parent" = + $v ["parent"]); '), $a); */print_r ($t);

Array
(
[0] = = Array
(
[Parent] = 1
)

[1] = = Array
(
[Parent] = 1
)

[2] = = Array
(
[Parent] = 2
)

)

function intersect2nd ($arr 1, $arr 2, $key)
{
foreach ($arr 2 as $v) $TMPARR [] = $v [$key];
foreach ($arr 1 as $k + $v) if (In_array ($v [$key], $TMPARR)) $arr [$k] = $v;
return $arr;
}
$a =array (0 = = Array (' catid ' = ' = ', ' parent ' = ' 1 '), 1 = = Array (' catid ' = = '), ' parent ' = 1), array (' catid ', ' parent ' = 2));
$b =array (Array (' parent ' = 2)); This is a similar array, containing the required key and value.
$c = intersect2nd ($a, $b, ' parent ');
Var_export ($c);

Memory of this is the moderator nagging code, dare not to usurp

PHP code?1234567$a = Array (0 = = Array (' catid ' = ' = ', ' parent ' = ' 1 '), 1 = = Array (' catid ' + = ' Parent ' = = 1 ', array (' catid ' = +, ' parent ' = 2)); $t = Array_map (function ($v) {R ...
First Thank you Moderator

But that's not true, I might not be able to express it very clearly, I was hoping to keep the parent's value of 2 in the array, that is, to keep the array (' catid ' = +, ' parent ' = 2).

function intersect2nd ($arr 1, $arr 2, $key)
{
foreach ($arr 2 as $v) $TMPARR [] = $v [$key];
foreach ($arr 1 as $k + $v) if (In_array ($v [$key], $TMPARR)) $arr [$k] = $v;
return $arr;
}
$a =arra ...
Thank you for having solved it.

Obviously it's not my code, because it doesn't fit my writing style.

function intersect2nd ($arr 1, $arr 2, $key)
{
foreach ($arr 2 as $v) $TMPARR [] = $v [$key];
foreach ($arr 1 as $k + $v) if (In_array ($v [$key], $TMPARR)) $arr [$k] = $v;
return $arr;
}
$a =arra ...

If you don't like the callback function, you can write this.

$a = array (' catid ' = ' = ', ' parent ' = ' 1 '), 1 = = Array (' catid ' + = = ' Parent ' = 1), arr Ay (' catid ' = ' parent ' = 2)), foreach ($a as $r) {  $t [] = Array_intersect_key ($r, Array (' parent ' = ') ') ;}

Obviously it's not my code, because it doesn't fit my writing style.

Reference 2 Floor snmr_com's reply: function intersect2nd ($arr 1, $arr 2, $key)
{
foreach ($arr 2 as $v) $TMPARR [] = $v [$key];
foreach ($arr 1 as $k + $v) if (In_array ($v [$key], $tmpA ...

Hey, I said is the idea, I changed to own class inside a method used, now copy changed version came out

But that's not true, I might not be able to express it very clearly, I was hoping to keep the parent's value of 2 in the array, that is, to keep the array (' catid ' = +, ' parent ' = 2). Oh, write it like this.

$a = array (' catid ' = ' = ', ' parent ' = ' 1 '), 1 = = Array (' catid ' + = = ' Parent ' = 1), arr Ay (' catid ' = ' parent ' = 2)); $t = Array_filter ($a, function ($v) {return $v [' parent '] = = 2;}); Print_r ($t);

Array
(
[2] = = Array
(
[CATID] = 21
[Parent] = 2
)

)

