<?php
$x = array(
"C_Card_ID" => array(
"dbName"=>"CardID",
"type"=>"disabled",
"key"=>"primary"
),
"C_Payroll_ID" => array(
"dbName"=> "PayrollID",
"key"=>"unique"
),
"C_First_Name" => array("dbName"=>"FirstName")
?>
I want keys of $x which has "key" index in its second array. In simple words, i need C_Card_ID and C_Payroll_ID as an output in array, so later i will implode them.
Required output Sample : Array("C_Card_ID","C_Payroll_ID")
Please don't use Loop algo. I need to use some build-in function.
You can use array_filter:
syntax is:
$filtered_array = array_keys(array_filter($x, function($a){ return isset($a['key']); }));
This should do:
$result = array_keys(array_filter($x, function($arr){
return array_key_exists('key', $arr);
}));
Try to use array_slice() like,
<?php
$x = array(
"C_Card_ID" => array(
"dbName"=>"CardID",
"type"=>"disabled","key"=>"primary"
),
"C_Payroll_ID" => array(
"dbName"=> "PayrollID",
"key"=>"unique"
),
"C_First_Name" => array("dbName"=>"FirstName"));
print_r(array_slice(array_keys($x),0,2));
//Outputs
//Array ( [0] => C_Card_ID [1] => C_Payroll_ID )
?>
Tested on http://writecodeonline.com/php/
Related
This question already has answers here:
How add a link on comma separated multidimensional array
(2 answers)
Closed 7 months ago.
I am trying to generate a string from an array. Need to concatenate the array values with a small string AFTER the value. It doesn't work for the last value.
$data = array (
1 => array (
'symbol' => 'salad'
),
2 => array (
'symbol' => 'wine'
),
3 => array (
'symbol' => 'beer'
)
);
$symbols = array_column($data, 'symbol');
$string_from_array = join($symbols, 'bar');
echo($string_from_array);
// expected output: saladbar, winebar, beerbar
// output: saladbar, winebar, beer
You can achieve it a few different ways. One is actually by using implode(). If there is at least one element, we can just implode by the delimiter "bar, " and append a bar after. We do the check for count() to prevent printing bar if there are no results in the $symbols array.
$symbols = array_column($data, "symbol");
if (count($symbols)) {
echo implode("bar, ", $symbols)."bar";
}
Live demo at https://3v4l.org/ms5Ot
You can also achieve the desired result using array_map(), as follows:
<?php
$data = [
1 => ['symbol' => 'salad'],
2 => ['symbol' => 'wine'],
3 => ['symbol' => 'beer']
];
echo join(", ", array_map(
fn($v) => "{$v}bar",
array_column($data, 'symbol')
)
);
See live code
Array_map() takes every element of the array resulting from array_column() pulling out the values from $data and with an arrow function, appends the string "bar". Then the new array yielded by array_map has the values of its elements joined with ", " to form the expected output which is then displayed.
As a recent comment indicated you could eliminate array_column() and instead write code as follows:
<?php
$data = [
1 => ['symbol' => 'salad'],
2 => ['symbol' => 'wine'],
3 => ['symbol' => 'beer']
];
echo join(", ", array_map(
fn($row) => "{$row['symbol']}bar",
$data
)
);
See live code
Note while this 2nd way, may appear more direct, is it? The fact is that as array_map iterates over $data, the arrow function contains code that requires dereferencing behind the scenes, namely "$row['symbol']".
The join() function is an alias of implode() which
Returns a string containing a string representation of all the array
elements in the same order, with the glue string between each element.
So you need to add the last one by yourself
$data = array (
1 => array (
'symbol' => 'salad'
),
2 => array (
'symbol' => 'wine'
),
3 => array (
'symbol' => 'beer'
)
);
$symbols = array_column($data, 'symbol');
$string_from_array = join($symbols, 'bar');
if(strlen($string_from_array)>0)
$string_from_array .= "bar";
echo($string_from_array);
You can use array_column and implode
$data = array (
1 => array (
'symbol' => 'salad'
),
2 => array (
'symbol' => 'wine'
),
3 => array (
'symbol' => 'beer'
)
);
$res = implode("bar,", array_column($data, 'symbol'))."bar";
Live Demo
Try this:
$symbols = array_column($data, 'symbol');
foreach ($symbols as $symbol) {
$symbol = $symbol."bar";
echo $symbol;
}
btw, you can't expect implode to do what you expect, because it places "bar" between the strings, and there is no between after the last string you get from your array. ;)
Another way could be using a for loop:
$res = "";
$count = count($data);
for($i = 1; $i <= $count; $i++) {
$res .= $data[$i]["symbol"] . "bar" . ($i !== $count ? ", " : "");
}
echo $res; //saladbar, winebar, beerbar
Php demo
I have a key value array in php like this
[1]=>"something"
[2]=>"somethingelse"
[4]=>"this"
Now i would like to export this as json, reverse the array, but keep the indexes. So the json format would look something like
{
"4":"this",
"2":"somethingelse"
"1":"something"
}
Is there an easy way to accomplish this (without parsing the json manually)?
$reverse = array_reverse($array, true);
$json = json_encode ($reverse);
You need to preserve the keys in the array_reverse to get this working.
<?php
$arr=array(1=>"something",2=>"somethingelse",4=>"this");
echo json_encode(array_reverse($arr,true),true);
OUTPUT :
{"4":"this","2":"somethingelse","1":"something"}
You can use array_flip() for this.
$array = array(1 => 'one', 2 => 'two');
$arrayFlipped = array_flip($array);
/*
$arrayFlipped:
Array
(
[one] => 1
[two] => 2
)
*/
$arr = array(
1 => "something",
2 => "somethingelse",
4 => "this"
);
$arr = array_reverse($arr,true); // true!
echo json_encode($arr);
If you wish to reverse the order of the array, it's best to do so before conversing it to JSON. You can do this using the array_reverse() function, you will need to set the second parameter to TRUE to preserve the indexes.
<?php
$myArray = Array(
1 => "something",
2 => "somethingelse",
4 => "this"
);
$myJSON = json_encode( array_reverse( $myArray, true ) );
print_r( $myJSON );
?>
array_reverse
Example:
$arr = array("apple","banana","orange");
$reversed = array_reverse($arr,true);
echo json_encode($reversed);
OK, I already got this question in stackoverflow but sadly it's in javascript - Javascript - sort array based on another array
and I want it in PHP
$data = array(
"item1"=>"1",
"item2"=>"3",
"item3"=>"5",
"item4"=>"2",
"item5"=>"4"
);
to match the arrangement of this array:
sortingArr = array("5","4","3","2","1");
and the output I'm looking for:
$data = array(
"item3"=>"5",
"item5"=>"4",
"item2"=>"3",
"item4"=>"2",
"item1"=>"1"
);
Any idea how this can be done?
Thanks.
For a detailed answer, why array_multisort does not match your needs, view this answer, please:
PHP array_multisort not sorting my multidimensional array as expected
In short: You want to sort an array based on a predefined order. The Answer is also given over there, but i copied one solution to this answer, too:
Use usort and array_flip, so you be able to turn your indexing array (ValueByPosition) into a PositionByValue Array.
$data = array(
"item1"=>"1",
"item2"=>"3",
"item3"=>"5",
"item4"=>"2",
"item5"=>"4"
);
usort($data, "sortByPredefinedOrder");
function sortByPredefinedOrder($leftItem, $rightItem){
$order = array("5","4","3","2","1");
$flipped = array_flip($order);
$leftPos = $flipped[$leftItem];
$rightPos = $flipped[$rightItem];
return $leftPos >= $rightPos;
}
print_r($data);
// usort: Array ( [0] => 5 [1] => 4 [2] => 3 [3] => 2 [4] => 1 )
// uasort: Array ( [item3] => 5 [item5] => 4 [item2] => 3 [item4] => 2 [item1] => 1 )
However this would require you to predict all possible items inside the predefined order array, or thread other items in an appropriate way.
If you want to maintain the assoc keys, use uasort instead of usort.
Pretty simple ?
$data = array(
"item1"=>"1",
"item2"=>"3",
"item3"=>"5",
"item4"=>"2",
"item5"=>"4"
);
$sortingArr = array("5","4","3","2","1");
$result = array(); // result array
foreach($sortingArr as $val){ // loop
$result[array_search($val, $data)] = $val; // adding values
}
print_r($result); // print results
Output:
Array
(
[item3] => 5
[item5] => 4
[item2] => 3
[item4] => 2
[item1] => 1
)
using usort() the right way i think
Sort an array by values using a user-defined comparison function
you can do as follow:
$data = array(
"item1"=>"1",
"item2"=>"3",
"item3"=>"5",
"item4"=>"2",
"item5"=>"4"
);
$sortingArr = array("5","4","3","2","1");
$keys = array_flip($sortingArr);
usort($data, function ($a, $b) use ($keys) {
return $keys[$a] > $keys[$b] ? 1 : -1;
});
print_r($data);
// Output
// Array ( [0] => 5 [1] => 4 [2] => 3 [3] => 2 [4] => 1 )
live example: https://3v4l.org/75cnu
Look at my following snippet to sort your array based on another array:
$res_arr = array();
for ($i = 0; $i < count($sortingArr); $i++) {
for ($j = 0; $j < count($data); $j++) {
if($data[$j] == $sortingArr[$i]) {
$res_arr[] = $data[$j];
break;
}
}
}
// $res_array is your sorted array now
Look at code snippet to make a multidimensional array sort in order of input
$input_format_list = [4, 1];
$data = array(
"0" => array(
"School" => array(
"id" => 1,
"name" => "ST.ANN'S HIGH SCHOOL",
)
),
"1" => array(
"School" => array(
"id" => 4,
"name" => "JYOTI VIDHYA VIHAR",
)
)
);
$result = array(); // result array
foreach($input_format_list as $key => $value){ // loop
foreach ($data as $k => $val) {
if ($data[$k]['School']['id'] === $value) {
$result[$key] = $data[$k];
}
}
}
return $result;
Take a look at array_multisort. I'm not completely sure how to use it, as I have never found a practical use for it (I prefer to use usort to clearly define my terms), but it might work for you.
<?php
$data = array(
"item1"=>"1",
"item2"=>"3",
"item3"=>"5",
"item4"=>"2",
"item5"=>"4"
);
$result=array_flip($data);
krsort($result);
$result=array_flip($result);
print_r($result);
//use rsort for the index array
$sortingArr = array("5","4","3","2","1");
print_r($sortingArr);
I'm pretty proud of my solution:
uasort($data, function($a, $b) use ($sortingArr) {
return array_search($a, $sortingArr) <=> array_search($b, $sortingArr);
});
Working example: https://3v4l.org/bbIk2
It uses uasort to maintain the key-value associations as the OP requested. (unlike #hassan's otherwise elegant solution)
It doesn't require that every element in the $data array be present in the sorting array. (like #HamZa's solution)
It's brief.
It uses the spaceship operator <=> for comparison instead of more verbose logic.
Code:
Expanding on the Answer of Andrew, if you want the undefined entries in the sorting array to appear at the end of the output array:
uasort($currentTags, function ($a, $b) use ($sortingArr) {
if (in_array($a, $sortingArr) && !in_array($b, $sortingArr)) return -1;
if (!in_array($a, $sortingArr) && in_array($b, $sortingArr)) return 1;
if (!in_array($b, $sortingArr)) return -1;
return array_search($a, $sortingArr) <=> array_search($b, $sortingArr);
});
I have a nested assocative array which might look something like this:
$myarray = array(
['tiger'] => array(
['people'], ['apes'], ['birds']
),
['eagle'] => array(
['rodents'] => array(['mice'], ['squirrel'])
),
['shark'] => ['seals']
);
How can I loop through the first layer (tiger, eagle, shark) in a random order and ensure that I cover them all in my loop? I was looking at the PHP function shuffle();, but I think that function messes up the whole array by shuffling all layers.
You can randomly sort an array like this, it will keep the keys and the values
<?php
$myarray = array(
'tiger' => array(
'people', 'apes', 'birds'
),
'eagle' => array(
'rodents' => array('mice', 'squirrel')
),
'shark' => 'seals'
);
$shuffleKeys = array_keys($myarray);
shuffle($shuffleKeys);
$newArray = array();
foreach($shuffleKeys as $key) {
$newArray[$key] = $myarray[$key];
}
print_r($newArray);
You can get the keys using array_keys(). Then you can shuffle the resulting key array using shuffle() and iterate through it.
Example:
$keys = array_keys($myarray);
shuffle($keys);
foreach ($keys as $key) {
var_dump($myarray[$key]);
}
According to my test, shuffle only randomizes 1 layer. try it yourself:
<?php
$test = array(
array(1,2,3,4,5),
array('a','b','c','d','e'),
array('one','two','three','four','five')
);
shuffle($test);
var_dump($test);
?>
Basically what I'm looking to do is have 2+ different keys pointing to the same value.
Something like:
"AP7898",
"AP7841" => array('loadStatusLoad' => '.1.3.6.1.4.1.318.1.1.12.2.3.1.1.2',
'loadStatusStatus => '.1.3.6.1.4.1.318.1.1.12.2.3.1.1.3',
),
both are ap7898 and ap7841 point to the values.
$val = 'hi';
$arr = array(
'a1' => $val,
'a2' => $val
);
or use references
$val = 'hi';
$arr = array(
'a1' => &$val,
'a2' => &$val
);
$val = 'bye'; // both are updated
Why not setup the parent array, setup the first key/value pair, and copy to the second?
$status = array( 'AP7898', 'AP7841' );
$status['AP7898'] = array('loadStatusLoad' => '.1.3.6.1.4.1.318.1.1.12.2.3.1.1.2',
'loadStatusStatus' => '.1.3.6.1.4.1.318.1.1.12.2.3.1.1.3');
$status['AP7841'] = $status['AP7898'];
If you want to have possibility to modify them using either of keys, you are looking for references.