search and replace value in PHP array

Question

I was looking for some standard PHP function to replace some value of an array with other, but surprisingly I haven't found any, so I have to write my own:

function array_replace_value(&$ar, $value, $replacement) {     if (($key = array_search($ar, $value)) !== FALSE) {         $ar[$key] = $replacement;     } } 

But I still wonder - for such an easy thing there must already be some function for it! Or maybe much easier solution than this one invented by me?

Note that this function will only do one replacement. I'm looking for existing solutions that similarly replace a single occurrence, as well as those that replace all occurrences.

Answer 1

Instead of a function that only replaces occurrences of one value in an array, there's the more general array_map:

array_map(function ($v) use ($value, $replacement) {     return $v == $value ? $replacement : $v; }, $arr); 

To replace multiple occurrences of multiple values using array of value => replacement:

array_map(function ($v) use ($replacement) {     return isset($replacement[$v]) ? $replacement[$v] : $v; }, $arr); 

To replace a single occurrence of one value, you'd use array_search as you do. Because the implementation is so short, there isn't much reason for the PHP developers to create a standard function to perform the task. Not to say that it doesn't make sense for you to create such a function, if you find yourself needing it often.

Answer 2

While there isn't one function equivalent to the sample code, you can use array_keys (with the optional search value parameter), array_fill and array_replace to achieve the same thing:

EDIT by Tomas: the code was not working, corrected it:

$ar = array_replace($ar,     array_fill_keys(         array_keys($ar, $value),         $replacement     ) );