searching a key value in multidimensional array in php - php

Question

Am totally confused with the multidimensional arrays in php. I have a very big array in which am trying to do some search. That is if the colour is green, check for the age and resultant array should contain 4 highest value of age with colour green and all other subarrays should be unaffected. Please help
Array
(
[0] => Array
(
[name] => arr1
[data] => Array
(
[0] => Array
(
[name] => A
[age] => 5
[color] => green
)
[1] => Array
(
[name] => B
[age] => 4
[color] => green
)
[2] => Array
(
[name] => C
[age] => 10
[color] => Red
)
[3] => Array
(
[name] => F
[age] => 1
[color] => green
)
)
)
[1] => Array
(
[name] => arr2
[data] => Array
(
[0] => Array
(
[name] => cc
[age] => 8
[color] => yellow
)
[1] => Array
(
[name] => Y
[age] => 20
[color] => green
)
[2] => Array
(
[name] => Y
[age] => 9
[color] => green
)
)
)
)
Expected resultant array is
Array
(
[0] => Array
(
[name] => arr1
[data] => Array
(
[0] => Array
(
[name] => A
[age] => 5
[color] => green
)
[1] => Array
(
[name] => B
[age] => 4
[color] => green
)
[2] => Array
(
[name] => C
[age] => 10
[color] => Red
)
)
)
[1] => Array
(
[name] => arr2
[data] => Array
(
[0] => Array
(
[name] => cc
[age] => 8
[color] => yellow
)
[1] => Array
(
[name] => Y
[age] => 20
[color] => green
)
[2] => Array
(
[name] => Y
[age] => 9
[color] => green
)
)
)
)

Answer 1

<?php
// Your code here!
$ar[0] = array('name' => 'arr1',
'data' => array
(
'0' => array
(
'name' => 'A',
'age' => 5,
'color' => 'green'
),
'1' => array
(
'name' => 'B',
'age' => 4,
'color' => 'green'
),
'2' => array
(
'name' => 'C',
'age' => 10,
'color' => 'Red'
),
'3' => array
(
'name' => 'F',
'age' => 1,
'color' => 'green'
)
)
);
$ar[1] = array
(
'name' => 'arr2',
'data' => array
(
'0' => array
(
'name' => 'cc',
'age' => 8,
'color' => 'yellow'
),
'1' => array
(
'name' => 'Y',
'age' => 20,
'color' => 'green'
),
'2' => array
(
'name' => 'Y',
'age' => 9,
'color' => 'green'
)
)
);
$green = array();
foreach($ar as $k1=>$a1){
foreach($a1['data'] as $k2=>$a2){
if($a2['color']=='green') {
array_push($green,$a2['age']);
}
}
}
rsort($green);
$green = array_splice($green,0,4);
foreach($ar as $k1=>$a1){
foreach($a1['data'] as $k2=>$a2){
if($a2['color']=='green') {
if(!in_array($a2['age'], $green)){
unset($ar[$k1]['data'][$k2]);
}
}
}
}
print_r($ar);
?>