Search and replace inside an associative array

问题:

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.

回答1:

$myarray = array("user1" => "search1", "user2" => "search2" );

foreach($myarray as $key => $val)
{
    if ($val == 'search1') $myarray[$key] = 'search4';
}

回答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.

回答3:

Why not just do

if (isset($myarray[$user])) $myarray[$user] = 'search4';

回答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
)

回答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

回答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.

回答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;
}

回答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';
}

回答9:

Using str_replace should work:

$myarray = array("user1" => "search1", "user2" => "search2" ) ;

$newArray = str_replace('search1', 'search4', $myarray);

回答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;
}