如何用值数组替换数组中的值

Question

I have an array of values, for example

$fred = Array('one','two','@group','three','four');

and a second array

$group = Array('alpha','beta','gamma');

Which is the most efficient way to substitute the value '@group' with the values inside $group array? That is, to obtain

$expanded_fred = Array('one','two','alpha','beta','gamma','three','four');

PS The grouping method has only one level. No nested groups.

Answer 1

First lets use array_search to find the key of the @group element:

$replaceKey = array_search('@group', $fred);

Next we'll use array_splice to replace the @group element with the $group array:

array_splice($fred, $replaceKey, 1, $group);

$fred is now your expanded array.

Demo here: https://3v4l.org/qf4ts

Answer 2

You can iterate the $fred to find all @group to replace them with $group . Demo

$result = [];
$fred = Array('one','two','@group','three','four');
$group = Array('alpha','beta','gamma');
foreach($fred as $value){
    if($value == '@group'){
        $result = array_merge($result,$group);
    }else{
        $result[] = $value;
    }
}
print_r($result);