Search and replace inside an associative array - php

Question

I need to search and replace inside an associative array.
ex:
$user = "user1"; // I've updated this
$myarray = array("user1" => "search1", "user2" => "search2", "user3" => "search1" ) ;
I want to replace search1 for search4. How can I achieve this?
UPDATE: I forgot to mention that the array has several search1 values and I just want to change the value where the key is == $user. Sorry for not mention this earlier.

Answer 1

$myarray = array("user1" => "search1", "user2" => "search2" );
foreach($myarray as $key => $val)
{
if ($val == 'search1') $myarray[$key] = 'search4';
}

Answer 2

There's a function for this : array_map().
// Using a lamba function, PHP 5.3 required
$newarray = array_map(
function($v) { if ($v == 'search1') $v = 'search4'; return $v; },
$myarray
);
If you don't want to use a lambda function, define a normal function or method and callback to it.

Answer 3

Why not just do
if (isset($myarray[$user])) $myarray[$user] = 'search4';

Answer 4

$user = "user1";
$myarray = array("user1" => "search1", "user2" => "search2", "user3" => "search1" );
foreach($myarray as $key => $val)
{
if ($val == 'search1' and $key == $user )
{
$myarray[$key] = 'search4';
break;
}
}
print_r($myarray);
Prints:
Array
(
[user1] => search4
[user2] => search2
[user3] => search1
)

Answer 5

$originalArray = array( "user1" => "search1" , "user2" => "search2" );
$pattern = 'search1';
$replace = 'search4';
$replacedArray = preg_replace( '/'.$pattern.'/' , $replace , $originalArray );
Fixes the risk mentioned in comment in response to this solution

Answer 6

Updated
Since the post was updated, and I have had chance to get some sleep, I realized my answer was stupid. If you have a given key and you need to change it's value, why iterate over the whole array?
$user = 'user1';
$search = 'search1';
$replace = 'search4';
$array = array('user1' => 'search1', 'user2' => 'search2');
if (isset($array[$user]) && $search === $array[$user]) $array[$user] = $replace;
Similar to #Joseph's method (pretty much the same), but with a few tweaks:
$user = 'user1';
$array = array("user1" => "search1", "user2" => "search2" );
foreach($array as $key => &$value) {
if ($key === $user) {
$value = 'search4';
break; // Stop iterating after key has been found
}
}
Passing by reference is a nicer way to edit inside foreach, and is arguably quicker.

Answer 7

Search and replace inside an associative array or numeric
Replace value in any associative array and array can be any deep
function array_value_replace($maybe_array, $replace_from, $replace_to) {
if (!empty($maybe_array)) {
if (is_array($maybe_array)) {
foreach ($maybe_array as $key => $value) {
$maybe_array[$key] = array_value_replace($value, $replace_from, $replace_to);
}
} else {
if(is_string($maybe_array)){
$maybe_array = str_replace($replace_from, $replace_to, $maybe_array);
}
}
}
return $maybe_array;
}

Answer 8

if you want for particular key then you just add condition for key in previous ans like.
$user = "user1";
$myarray = array("user1" => "search1", "user2" => "search2" );
foreach($myarray as $key => $val)
{
if ($val == 'search1' && $key == $user) $myarray[$key] = 'search4';
}

Answer 9

Using str_replace should work:
$myarray = array("user1" => "search1", "user2" => "search2" ) ;
$newArray = str_replace('search1', 'search4', $myarray);

Answer 10

Following on from Joseph's answer, using preg_replace may enable you to use the code in other situations:
function pregReplaceInArray($pattern,$replacement,$array) {
foreach ($array as $key => $value) {
$array[$key] = preg_replace($pattern,$replacement,$value);
}
return $array;
}