get key or value from array to use in php

Question

I want to assign values from an array to a simple variable, my code is as follows :

$codeval = $_POST['code']; //can be Apple or Banana or Cat or Dog
$systemrefcode = array("a" => "Apple", "b" => "Banana", "C" => "Cat", "D" => "Dog");

foreach($systemrefcode as $code => $value) {
     if($codeval == $value){ //if Apple exists in array then assign code and use it further
        $codes = $code;//Assign code to codes to use in next step

     }
$selection = 'Your Selection is -'.$codes.'and its good.';
echo $selection;

When I check in console it shows no response. What am I doing wrong?

Not sure if it fixes it, but you are missing a double quote in "D => "Dog". Try "D" => "Dog" and there is a closing } missing. — The fourth bird
– The fourth bird, Commented Aug 30, 2018 at 18:21
those are common mistakes, i did them in a hurry, but still after fixing that didn;t get what i wanted — BRAHMA
– BRAHMA, Commented Aug 30, 2018 at 18:25
What happens when you var_dump $codeval? If it doesn't match anything in your array, you won't get any output. — MandyShaw
– MandyShaw, Commented Aug 30, 2018 at 19:20
as far i can see they;re matching the array but i got no response. — BRAHMA
– BRAHMA, Commented Aug 30, 2018 at 19:25

Thiago Bittencourt · Accepted Answer · 2018-08-30 19:06:53Z

1

You can get the key of the wanted value with array_search():

$array = array(0 => 'blue', 1 => 'red', 2 => 'green', 3 => 'red');

$key = array_search('green', $array); // $key = 2;

So, for your code works, you can use like this:

$codeval = $_POST['code'];
$systemrefcode = array("a" => "Apple", "b" => "Banana", "C" => "Cat", "D" => "Dog");

$code = array_search($codeval, $systemrefcode);

$selection = 'Your Selection is - '.$code.' and its good.';
echo $selection;

OBS.:

array_search() will return false if value is not found;
array_search() is case sensitive, so if you have 'Apple' in the array and search for 'apple', it'll return false.

edited Aug 30, 2018 at 19:06

answered Aug 30, 2018 at 18:25

Thiago Bittencourt

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5 Comments

BRAHMA Over a year ago

but when the requirement is dynamic, like have the same array as you mentioned, and will do like this $color = $_POST['color']; $key = array_search($color, $array); $choose = 'You chose'.$key.'color code'; echo $choose; Will i get the code of the respective color from array?

Thiago Bittencourt Over a year ago

@BRAHMA array_search() returns the key of the searched value, so if the key is a color code, yes, you'll get the code of the respective color. But have in mind that array_serach() will return false if searched value is not in the array.

BRAHMA Over a year ago

Did you run my code and checked? See nothing is coming.

Thiago Bittencourt Over a year ago

@BRAHMA I edited the post to show you how you can use it in your code.

Thiago Bittencourt Over a year ago

@BRAHMA what do you mean as "not working"? it's echoing nothing? are you having en error message? and also the code in this link is not the one I wrote.

Barmar · Accepted Answer · 2018-08-30 19:18:35Z

0

You can flip the $systemrefcode array so that the values become keys and vice versa.

$coderefsystem = array_flip($systemrefcode);
$codes = $coderefsystem($codeval);
$selection = 'Your Selection is -'.$codes.'and its good.';
echo $selection;

answered Aug 30, 2018 at 19:18

Barmar

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Comments

The fourth bird · Accepted Answer · 2018-08-30 19:29:45Z

0

You could break out of the foreach when there is a match and echo the string afterwards.

$post = "1-Apple";
$codeval = explode('-', $post)[1];
$systemrefcode = array("a" => "Apple", "b" => "Banana", "C" => "Cat", "D" => "Dog");
$codes = "";

foreach ($systemrefcode as $code => $value) {
    if ($codeval === $value) { //if Apple exists in array then assign code and use it further
        $codes = $code;//Assign code to codes to use in next step
        break;
    }
}

if ($codes !== "") {
    $selection = 'Your Selection is -' . $codes . ' and its good.';
    echo $selection; // Your Selection is -a and its good.
} else {
    echo "codes is empty";
}

edited Aug 30, 2018 at 19:29

answered Aug 30, 2018 at 18:31

The fourth bird

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4 Comments

BRAHMA Over a year ago

This is working since you assigned the value directly to $codeval, but in my case the value is coming to this php file via AJAX and using form serialize(), so do i need to do something special and again the value assigned to the $codeval is like (1-Apple, and i'm exploding it then assigning the 1st index to $codeval and then doing the rest), is there any modification to code, as per your suggestion?

The fourth bird Over a year ago

@BRAHMA So you are doing something like 3v4l.org/GK09a What exactly is missing?

BRAHMA Over a year ago

In my case again its not working, will you please check this one 3v4l.org/rhlil

The fourth bird Over a year ago

@BRAHMA You are forgetting explode. Check 3v4l.org/sYDar That will return an array from which you will get the second entry [1] which will be "Prepaid"

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