CODEWITHSUNDEEP
phparrays
Hans Vn
Hans Vn

Reputation: 844

Finding a specific key in an php array

I have some troubles finding the right key in an array:

when I have an array: $haystack

$haystack = array(0 => 'apple', 
                  1 => 'apple', 
                  2 => 'pear', 
                  3 => 'apple', 
                  4 => 'banana');

and is use the function array_search

$key = array_search('apple', $haystack);

the function wil set the $key value to '0' ( $key = 0 )

I need to find the key of the fourth item in the array (3) which is also apple... Does anyone know a function that searches the array from a given index and returns a value?

for example something like: 

array_search_start($needle, $haystack, $startPosition);

Upvotes: 0

Views: 4676

Answers (8)

Sam Arul Raj T
Sam Arul Raj T

Reputation: 1770

This will be so easy to use

$haystack = array(0 => 'apple', 
                  1 => 'apple', 
                  2 => 'pear', 
                  3 => 'apple', 
                  4 => 'banana');

$keys = array_keys($haystack,'apple');
foreach($keys as $k):
    $searchK[] = $haystack[$k];
endforeach;

print_r($searchK);

Upvotes: 0

Ali Demirci
Ali Demirci

Reputation: 326

$haystack = array(0 => 'apple', 
                  1 => 'apple', 
                  2 => 'pear', 
                  3 => 'apple', 
                  4 => 'banana');
$find = 'apple';
foreach ($haystack as $k=>$v) {
    if($find == $v) {
            echo 'found! key is '.$k.'<br />';
            }
}

Upvotes: 0

dfsq
dfsq

Reputation: 193261

Use array_keys with the second parameter to specify value to search keys for. 

$keys = array_keys($haystack, 'apple');

So $keys will contain array of found keys corresponding to search value (apple):

Array
(
    [0] => 0
    [1] => 1
    [2] => 3
)

Now you can get the last one, or the first, etc. If you need the last:

$key = end($keys);

Upvotes: 4

chenio
chenio

Reputation: 592

<?

$array = array("one"=>'paul',"two"=>'lady');
print_r(array_values($array));

?>

Upvotes: 0

Sabari
Sabari

Reputation: 6335

You can use array_keys to get all keys with values apple

$keys = array_keys($haystack, 'apple');

if you need it to write as a function then you can do:

$searchValue = 'apple';
$keys = searchKeys($haystack, $searchValue);
function searchKeys($haystack,$searchValue) {
     $keys = array_keys($haystack, $searchValue);
     return $keys;
}

Hope this helps you :)

Upvotes: 0

DJ Burb
DJ Burb

Reputation: 2364

Don't know much about PHP but, couldn't you just include an offset as the start position?

int strpos ( string $haystack , mixed $needle [, int $offset = 0 ] )

So, in your case you would do

$key = array_search('apple', $haystack, 2);

Upvotes: 0

Ben D
Ben D

Reputation: 14479

You can also use array_slice to do this more simply than looping:

<?php
$key = array_search($needle, array_slice($haystack, $startPosition,-1,true));
?>

This syntax requires PHP>=5.0.2, as we need to preserve the keys (hence the -1 (no length limit) and true which keeps the original keys)

Upvotes: 0

Mikhail
Mikhail

Reputation: 9007

This should work:

<?php
function array_search_start($needle, $haystack, $start) {
  for ($i = $start; $i < length($haystack); $i++)
    if ($haystack[$i] == $needle) return $i;
  return FALSE; // You'll need === operator to distinguish between False and 0
}
?>

Good luck!

Upvotes: 0

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