<?php
 
function array_replace_key(&$arr, $old, $new, $overwrite = true): bool {
    if (isset($arr[$new]) and !$overwrite) {
        return false;
    }
 
    $arr[$new] = $arr[$old];
    unset($arr[$old]);
 
    return true;
}
 
// Define o array que será modificado
$arr = [
    'title' => 'Um título qualquer',
    'description' => 'Descrição de alguma coisa qualquer'
];
 
// Substitui a chave desciption por descrição
array_replace_key($arr, 'description', 'descrição');
 
// Exibe o array
print_r($arr);
 
// Substitui a chave title por descrição, sem sobrescrita
array_replace_key($arr, 'title', 'descrição', false);
 
// Exibe o array
print_r($arr);

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