How to change php array position with condition in Php

Question

I am working with PHP,I have array and i want to change position of array, i want to display matching value in first position,For example i have following array

$cars=('Toyota','Volvo','BMW');

And i have variable $car="BMW" And i want to match this variable with array and if match then this array value should be at first in array so expected result is (matching record at first position)

$cars=('BMW','Volvo','Toyota');

How can i do this ?

That's not an array. Arrays are surrounded with square brackets [], not parentheses (). — Barmar
– Barmar, Commented Sep 8, 2022 at 4:56
Create a new empty array. Then loop your $cars array. For each element, check if the value matched your search value. If yes, you use array_unshift to prepend the value to the front of the new array. If not, then you just use array_push to add the value to the end of the new array. — Vlam
– Vlam, Commented Sep 8, 2022 at 5:05
Does this answer your question? Move an array element to a new index in PHP — abdo Salm
– abdo Salm, Commented Sep 8, 2022 at 5:42

Aqib Javed · Accepted Answer · 2022-09-08 05:03:47Z

0

You can use array_search and array_replace for this purpose. try below mentioned code

$cars=array(0 =>'Toyota',1 =>'Volvo',2 =>'BMW');
$car="BMW";

$resultIndex = array_search($car, $cars); //get index 

if($resultIndex)
{
$replacement = array(0 =>$car,array_search($car, $cars)=>$cars[0]); //swap with  0 index 
$cars = array_replace($cars, $replacement); //replace 
}

print_r($cars);

answered Sep 8, 2022 at 5:03

Aqib Javed

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jspit · Accepted Answer · 2022-09-08 12:23:05Z

0

This can be solved in one line with array_merge and array_unique array functions.

$cars=['Toyota','Volvo','BMW'];
$car="BMW";

$cars2 = array_unique(array_merge([$car],$cars));
//$cars2: array(3) { [0]=> string(3) "BMW" [1]=> string(6) "Toyota" [2]=> string(5) "Volvo" }

$car is always at the beginning of the new array due to array_merge. If $car already exists in the $cars array, array_unique will remove it. If $car is not present in the $cars array, it is added at the beginning. If this behavior is not desired, you can use in_array to test whether $car is also contained in the $cars array.

answered Sep 8, 2022 at 12:23

jspit

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Robbie · Accepted Answer · 2022-09-08 04:57:19Z

-1

The simplest is to "sort" by "Value = BMW", "Value != BMW".

The function that sorts and resets the keys (i.e. starts the resulting array from 0, which you want) is usort (https://www.php.net/manual/en/function.usort.php)

So your comparison function will be If ($a == "BMW") return 1, elseif ($b == "BMW") return -1, else return 0; (Paraphrased, don't expect that to work exactly - need to leave a bit for you to do!)

answered Sep 8, 2022 at 4:57

Robbie

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2 Comments

Barmar Over a year ago

, should be ;

Robbie Over a year ago

@Barmar : no, it shouldn't :). It's a comma. I'm not writing the solution, but paraphrasing how the OP can work out what the solution is and then they can work it out themselves next time, and the time after that; otherwise I can send a bill if the OP wants me to write their application.

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