How can I replace a specific key's value in an array in php?

Question

I have a an array that has 3 values. After the user pushes the submit button I want it to replace the the value of a key that I specify with another value.

If I have an array with the values (0 => A, 1 => B, 2 => C), and the function is run, the resulting array should be (0 => A, 1 => X, 2 => C), if for example the parameter for the function tells it to the replace the 2nd spot in the array with a new value.

Aurelio De Rosa · Accepted Answer · 2011-11-20 02:31:39Z

23

If you know the key, you can do:

$array[$key] = $newVal;

If you don't, you can do:

$pos = array_search($valToReplace, $array);
if ($pos !== FALSE)
{
   $array[$pos] = $newVal;
}

Note that if $valToReplace is found in $array more than once, the first matching key is returned. More about array_search.

answered Nov 20, 2011 at 2:31

Aurelio De Rosa

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Comments

Amir Keramat · Accepted Answer · 2021-01-03 23:13:40Z

0

In case you want to have an inline solution you can use array_replace or array_replay_recrusive depending on which suits you best.

$replaced_arr = array_replace([
        'key' => 'old_value',
        0 => 'another_untouched_value'
    ],[
        'key' => 'new_value'
    ]);

It would be best if your array is key/value pair

answered Jan 3, 2021 at 23:13

Amir Keramat

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