PHP: how to get array based on nested value - php

Given this array and a name (e.g. 'def'), how do I get the containing array, or key?
$all = array(
'0' => array(
'name' => 'abc'
'option' => 1,
),
'1' => array(
'name' => 'def'
'option' => 1,
),
'2' => array(
'name' => 'ghi'
'option' => 0,
),
);
What's the best way to return this array given 'def'?
$single = array(
'name' => 'def'
'option' => 1,
);
I could do something like this:
$single = array();
foreach ($all as $key => $value) {
if ($value['name'] == 'def') {
$single = $all[$key];
}
}
Or prerender the keys in the array so that it looks like this:
$all = array(
'abc' => array(
'name' => 'abc'
'option' => 1,
),
'def' => array(
'name' => 'def'
'option' => 1,
),
'ghi' => array(
'name' => 'ghi'
'option' => 0,
),
);
$single = $all['def'];
But I'm wondering if there's a shorter php function for that.


You could use array_filter:
array_filter($array, function($var){
return $var["name"] == "def";
});

Related

How to set value in nested array PHP

I would like to set level to each array that has children key in nested array. More deep that array then more big the level value.
Here's what I'm expected:
<?php
$array = array(
array(
'id' => 1,
'children' => array(
array(
'id' => 6,
'children' => array(
array(
'id' => 7,
),
array(
'id' => 8,
)
),
// Expected
'level' => '2',
),
array(
'id' => 9,
)
),
// Expected
'level' => '1'
),
array(
'id' => 2,
'children' => array(
array(
'id' => 10,
),
array(
'id' => 13,
'children' => array(
array(
'id' => 14,
),
array(
'id' => 19,
'children' => array(
array(
'id' => 20,
),
array(
'id' => 21,
),
array(
'id' => 22,
),
array(
'id' => 23,
),
)
// Expected
'level' => '3'
)
),
// Expected
'level' => '2'
),
),
// Expected
'level' => '1'
)
);
So far I make a function to set the level that has children key in nested array. But, the result is not what I'm expected.
<?php
$array = array(
array(
'id' => 1,
'children' => array(
array(
'id' => 6,
'children' => array(
array(
'id' => 7,
),
array(
'id' => 8,
)
),
// Expected
// 'level' => '2',
),
array(
'id' => 9,
)
),
// Expected
// 'level' => '1'
),
array(
'id' => 2,
'children' => array(
array(
'id' => 10,
),
array(
'id' => 13,
'children' => array(
array(
'id' => 14,
),
array(
'id' => 19,
'children' => array(
array(
'id' => 20,
),
array(
'id' => 21,
),
array(
'id' => 22,
),
array(
'id' => 23,
),
)
// Reality result
// 'level' => '4'
)
),
// Reality result
// 'level' => '3'
),
),
// Reality result
// 'level' => '2'
)
);
As you can see in Reality result comment is level 2, level 3, and level 4. What I'm expected the result is level 1, level 2, level 3, level (n+1). When there's not any children in the deeper array then the level value must be reset to level 1.
Here's my code that get the reality result:
<?php
function updateTreeArray(&$array, $level = 1) {
foreach ($array as $key => &$value) {
if (isset($value['children'])) {
$value['level'] = $level;
$level = setLevel($value['children'], $level);
}
if (is_array($value)) {
updateTreeArray($value, $level);
}
}
return $array;
}
function setLevel($array, $level) {
foreach ($array as $key => &$value) {
if (isset($value['children'])) {
$level += 1;
setLevel($value['children'], $level);
}
}
return $level;
}
print_r(updateTreeArray($array));
Could you please help me what should I do to achieve the expected result? Thanks.

One recursive function is enough.
function updateTreeArray(&$array, $level = 1)
{
foreach($array as &$item) {
if (array_key_exists('children', $item) && is_array($item['children'])) {
$item['level'] = $level;
updateTreeArray($item['children'], $level + 1);
}
}
}
updateTreeArray($array);
print_r($array);
fiddle

Replace key in array, with keeping order intact

I would like to replace keys in arrays, because I will move them on two indexes up.
Problem that I am facing is that those are containing same names which will not be ok, if i want to move them up.
This is how array looks like.
$list = array(
'ind' => array(
'messagetype' => 'Alert',
'visibility' => 'Public',
'info' => array(
0 => array(
'urgency' => 'Urgent',
'params' => array(
0 => array(
'Name' => 'display',
'value' => '3; top',
),
1 => array(
'Name' => 'level',
'value' => '1; blue',
),
),
'area' => array(
'ard' => 'Bob',
'code' => array(
0 => array(
'Name' => 'Badge',
'value' => 'GSSD154',
),
),
),
),
1 => array(
'messagetype' => 'Information',
'visibility' => 'Private',
'info' => array(
0 => array(
'urgency' => 'Minor',
'params' => array(
0 => array(
'Name' => 'display',
'value' => '1; left',
),
1 => array(
'Name' => 'level',
'value' => '1; red',
),
),
'area' => array(
'ard' => 'Bob',
'code' => array(
0 => array(
'Name' => 'Badge',
'value' => 'GBECS23',
),
),
),
),
),
),
),
),
);
and this is how I would like the output to be with changing keys in Name0, Name1, which are inside params.
$list = array(
'ind' => array(
'messagetype' => 'Alert',
'visibility' => 'Public',
'info' => array(
0 => array(
'urgency' => 'Urgent',
'params' => array(
0 => array(
'Name0' => 'display',
'value0' => '3; top',
),
1 => array(
'Name1' => 'level',
'value1' => '1; blue',
),
),
'area' => array(
'ard' => 'Bob',
'code' => array(
0 => array(
'Name' => 'Badge',
'value' => 'GSSD154',
),
),
),
),
1 => array(
'messagetype' => 'Information',
'visibility' => 'Private',
'info' => array(
0 => array(
'urgency' => 'Minor',
'params' => array(
0 => array(
'Name0' => 'display',
'value0' => '1; left',
),
1 => array(
'Name1' => 'level',
'value1' => '1; red',
),
),
'area' => array(
'ard' => 'Bob',
'code' => array(
0 => array(
'Name' => 'Badge',
'value' => 'GBECS23',
),
),
),
),
),
),
),
),
);
I have tried with a lots of examples over this website, but could not find one to achieve this.
Code that I used from
How to replace key in multidimensional array and maintain order
function replaceKey($subject, $newKey, $oldKey) {
// if the value is not an array, then you have reached the deepest
// point of the branch, so return the value
if (!is_array($subject)) {
return $subject;
}
$newArray = array(); // empty array to hold copy of subject
foreach ($subject as $key => $value) {
// replace the key with the new key only if it is the old key
$key = ($key === $oldKey) ? $newKey : $key;
// add the value with the recursive call
$newArray[$key] = replaceKey($value, $newKey, $oldKey);
}
return $newArray;
}
$s = replaceKey($list, 'Name0', 'Name');
print "<PRE>";
print_r($s);
at the moment I get this output:
[0] => Array
(
[Name0] => display
[value] => 1; left
)
[1] => Array
(
[Name0] => level
[value] => 1; red
)
any help would be appreciated. regards

A very strange question, but why not?
The following function returns nothing (a procedure) and changes the array in-place using references but feel free to rewrite it as a "real" function (without references and with a return statement somewhere).
The idea consists to search for arrays, with numeric keys and at least 2 items, in which each item has the Name and value keys. In other words, this approach doesn't care about paths where the targets are supposed to be:
function replaceKeys(&$arr) {
foreach ($arr as &$v) {
if ( !is_array($v) )
continue;
$keys = array_keys($v);
if ( count($keys) < 2 ||
$keys !== array_flip($keys) ||
array_keys(array_merge(...$v)) !== ['Name', 'value'] ) {
replaceKeys($v);
continue;
}
foreach ($v as $k => &$item) {
$item = array_combine(["Name$k", "value$k"], $item);
}
}
}
replaceKeys($list);
print_r($list);
demo

PHP if statement inside an array

I'm trying to write the below array if a value is set. How can I do this inside of an array? I know I could use a ternary operator but i'm not sure how.
array(
'name' => 'extraFields',
'attributes' => array(
'name' => 'portal',
),
if($Value === 1){
//Need to write the below when value is true
array(
'name' => 'portal',
'value'=> '',
'attributes' => array(
'id' => '1',
'value'=> 'testportal',
),
),
}
),

You cannot intersect a definition of an array with a conditional statement. What you need to do instead is to define your array first and then do an if statement which will add to the array. It's not entirely clear at what level of your array you want to add the conditional content, so I'll show it on a simplified example:
$value = 1;
$myArray = array(
'name' => 'Joe',
'kids' => array(
'name' => 'Mary',
),
);
if ($value === 1) {
$myArray['kids']['hobbies'] = 'kite flying';
}
After this, the variable $myArray will have the following content:
array(
'name' => 'Joe',
'kids' => array(
'name' => 'Mary',
'hobbies' => 'kite flying',
),
)
Where exactly you need to put your conditional data depends on the full structure of your array, but the idea is you access the parts you want through indices.
Edit: in case you can just add the needed subarray at the end of your array, you can utilize array_push.

There is 3 variants to do this:
// Variant 1
// Anonymous function, variables from the parent scope
$Value = 1;
$arr = array(
'name' => 'extraFields',
'attributes' => array(
'name' => 'portal',
),
'ifArray' => function() use ($Value) {
if ($Value == 1)
return array(
'name' => 'portal',
'value'=> '',
'attributes' => array(
'id' => '1',
'value'=> 'testportal',
),
);
}
);
print_r($arr['ifArray']());
// Variant 2
// Anonymous function, variable assignment
$arr = array(
'name' => 'extraFields',
'attributes' => array(
'name' => 'portal',
),
'ifArray' => function($Value) {
if ($Value == 1)
return array(
'name' => 'portal',
'value'=> '',
'attributes' => array(
'id' => '1',
'value'=> 'testportal',
),
);
}
);
$Value = 1;
print_r($arr['ifArray']($Value));
// Variant 3
// Ternar operator
$Value = 1;
$arr = array(
'name' => 'extraFields',
'attributes' => array(
'name' => 'portal',
),
'ifArray' => $Value != 1 ? null : array(
'name' => 'portal',
'value'=> '',
'attributes' => array(
'id' => '1',
'value'=> 'testportal',
)
)
);
print_r($arr['ifArray']);
However, the variant that El_Vanja suggested, might be more clear than those three.

How to copy this portion of the array to a new array in php?

I have this php array X.
X= array(
'Parent' => array(
'title' => '123',
)
)
I have this php array Y.
Y = array(
'Parent' => array(
'id' => '16',
'title' => 'T1',
),
'Children' => array(
(int) 0 => array(
'id' => '8',
'serial_no' => '1',
),
(int) 1 => array(
'id' => '9',
'serial_no' => '2',
),
(int) 2 => array(
'id' => '14',
'serial_no' => '6',
)
)
)
I want to copy the Children of array Y to the parent of array X to form array Z such that it looks like this;
Z= array(
'Parent' => array(
'title' => '123',
)
'Children' => array(
(int) 0 => array(
'serial_no' => '1'
),
(int) 1 => array(
'serial_no' => '2'
),
(int) 2 => array(
'serial_no' => '6'
)
)
)
Please note that the id key-value pair was removed from the Children of array Y.
I wrote some code of my own.
$Z = array();
$i=0;
foreach($Y as $temp)
{
$Z['Children'][$i] = $temp['Children'][$i];
unset($Z['Children'][$i]['id'];
$i++;
}
$Z['Parent']=$temp['Parent'];
Unfortunately, there is an undefined index error. How can this be done in php? Forget about my code if there are better approaches.

Actually your approach works too, but you need to iterate over sub-array:
$Z = array();
$i=0;
foreach($Y['Children'] as $temp)
{
$Z['Children'][$i] = $temp;
unset($Z['Children'][$i]['id'];
$i++;
}
or what I may do:
$Z = $X;
$Z['Children'] = array();
foreach ( $Y['Children'] as $child ) {
$Z['Children'][] = array(
'serial_no' => $child['serial_no'],
);
}

You can do like.
$Z = array();
foreach($Y['Children'] as $temp)
{
$Z['Children'][] = array('serial_no' => $temp['serial_no']);
}
$Z['Parent']=$X['Parent'];

PHP: Help with Sorting Array

How can I sort an associative array by a weight AND type?
Input
array(
'a' => array( 'type' => 't1', 'weight' => 1, 'text' => 'text1' ),
'b' => array( 'type' => 't1', 'weight' => 3, 'text' => 'text2' ),
'c' => array( 'type' => 't2', 'weight' => 5, 'text' => 'text3' ),
'd' => array( 'type' => 't1', 'weight' => 2, 'text' => 'text4' ),
'e' => array( 'type' => 't2', 'weight' => 4, 'text' => 'text5' ),
'f' => array( 'type' => 't2', 'weight' => 4, 'text' => 'text6' )
);
Desired Output
array(
'a' => array( 'type' => 't1', 'weight' => 1, 'text' => 'text1' ),
'd' => array( 'type' => 't1', 'weight' => 2, 'text' => 'text4' ),
'b' => array( 'type' => 't1', 'weight' => 3, 'text' => 'text2' ),
'e' => array( 'type' => 't2', 'weight' => 1, 'text' => 'text5' ),
'f' => array( 'type' => 't2', 'weight' => 1, 'text' => 'text6' ),
'c' => array( 'type' => 't2', 'weight' => 5, 'text' => 'text3' )
);
Type "t2" must appear at end of array, all other types at start.
Weight must be sorted after type.
I am using uasort with a custom compare function, but am struggling. Here is what I have, but it doesn't work:
function my_comparer($a, $b) {
return ( $a['type'] !== 't2' && $b['type'] === 't2' )
? -1
: $a['weight'] - $b['weight'];
}

Your function doesn't take account of ($a['type']=='t2')
function my_comparer($a, $b) {
if ( ($a['type']==='t2') && ($b['type']!=='t2')) return -1;
if ( ($b['type']==='t2') && ($a['type']!=='t2')) return 1;
return ($a['weight'] - $b['weight']);
}

Try this:
function my_comparer($a, $b) {
if( $a['type'] == $b['type'] ){
return $a['weight'] - $b['weight'];
}else{
if( $a['type'] > $b['type'] ) return 1;
else return -1;
}
}
(warning, this is untested)

Simpler way would be array_multisort
$data = array(
'a' => array( 'type' => 't1', 'weight' => 1, 'text' => 'text1' ),
'b' => array( 'type' => 't1', 'weight' => 3, 'text' => 'text2' ),
'c' => array( 'type' => 't2', 'weight' => 5, 'text' => 'text3' ),
'd' => array( 'type' => 't1', 'weight' => 2, 'text' => 'text4' ),
'e' => array( 'type' => 't2', 'weight' => 4, 'text' => 'text5' ),
'f' => array( 'type' => 't2', 'weight' => 4, 'text' => 'text6' )
);
// Obtain a list of columns
foreach ($data as $key => $row) {
$type[$key] = $row['type'];
$weight[$key] = $row['weight'];
}
array_multisort($type, SORT_ASC, $weight, SORT_ASC, $data);
Plus this works if you add any number of types you want sorted in the same way.

Helper function:
function arrayColumnSort(&$array, $directions) {
// collect columns
$columnNames = array_keys($directions);
$columns = array();
foreach ($array as $row) {
foreach ($columnNames as $columnName) {
if (!isset($columns[$columnName])) {
$columns[$columnName] = array();
}
$columns[$columnName][] = isset($row[$columnName]) ? $row[$columnName] : null;
}
}
// build array_multisort params
$params = array();
foreach ($directions as $columnName => $direction) {
$params = array_merge(
$params,
array($columns[$columnName]),
is_array($direction) ? $direction : array($direction)
);
}
$params[] =& $array;
// sort
call_user_func_array('array_multisort', $params);
}
Call:
arrayColumnSort($data, array(
'type' => SORT_ASC,
'weight' => SORT_ASC,
));

Categories