Codeigniter: how to convert array value from pointer?
I have an array like this
array(2) {
[0]=> object(stdClass)#20
(4) {
["id"]=> string(1) "1"
["name"]=> string(6) "robert"
["height"]=> string(3) "165"
["weight"]=> string(2) "81" }
[1]=> object(stdClass)#21
(4) {
["id"]=> string(1) "2"
["name"]=> string(4) "mike"
["height"]=> string(3) "175"
["weight"]=> string(2) "69" } }
so I want to change the values of the array.
For example, I want to change all values from ["height"]
and ["weight"]
. I classify height and weight as numbers like this:
height
1
= 150
..........170
2
= 171
..........190
weight
1
= 50
...........70
2
= 71
...........80
array(2) {
[0]=> object(stdClass)#20
(4) {
["id"]=> string(1) "1"
["name"]=> string(6) "robert"
["height"]=> string(1) "1"
["weight"]=> string(1) "2" }
[1]=> object(stdClass)#21
(4) {
["id"]=> string(1) "2"
["name"]=> string(4) "mike"
["height"]=> string(1) "2"
["weight"]=> string(1) "1" } }
my array dynamic
, so the value can change at any time. of course ["name"]
won't change at all because I haven't given categorization. can you help me solve this problem?
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Given your example array:
//example people array
$people = [
//robert
(object)[
"id" =>"1",
"name"=> "robert",
"height" => "165",
"weight" => "79",
],
//mike
(object)[
"id" => "2",
"name"=> "mike",
"height"=> "175",
"weight" =>"69",
]
];
You can loop through the array and change each object after a little comparison. Note not to check all possible ranges to keep it concise (this should be just a few checks)
//walk the array
array_walk($people, function($person){
//test height and assign category
if($person->height <= 190 && $person->height > 170)
$person->height = "2";
else
$person->height = "1";
//test weight and assign category
if($person->weight <= 80 && $person->weight > 70)
$person->weight = "2";
else
$person->weight = "1";
});
Which gives the desired output, you can check out live here (CTRL + ENTER to run)
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You can use an array callback function like array_map
function changeMe($itemArr) {
foreach($itemArr as $key=>$value) {
if($key == "a") {
$itemArr[$key] = "newVal";
}
}
return $itemArr;
}
$myArray = array(
0=>array(
"a"=>"1",
"b"=>"2"
),
1=>array(
"a"=>"1",
"b"=>"44"
)
);
$myArray = array_map("changeMe", $myArray);
var_dump($myArray);
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Use array_walk()
if you want to change the current array else, use array_filter()
if you want to create a new array,
Please note that any of these will not change your value in the database unless you do some query.
Using array_walk()
,
$array = array(); // your input array here
array_walk( $array, function(&$v){
( $v->height > 149 && $v->height < 171 ) ? ( $v->height = 1 ) : ( $v->height = 2 );
( $v->weight > 49 && $v->weight < 71 ) ? ( $v->weight = 1 ) : ( $v->weight = 2 );
});
Using array_filter()
,
$array = array(); // your input array here
$your_new_array = array_filter( $array, function($v){
( $v->height > 149 && $v->height < 171 ) ? ( $v->height = 1 ) : ( $v->height = 2 );
( $v->weight > 49 && $v->weight < 71 ) ? ( $v->weight = 1 ) : ( $v->weight = 2 );
return true;
});
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