<?php
 
$original = file_get_contents('/pasta/copy.txt');
$ip = file_get_contents('/pasta/origin.txt');
$copia = '/pasta/ok.txt';
 
if ($original == false || $ip == false){
    echo "Não foi possível ler algum dos arquivos.";
    die();
}
 
$string = str_replace('ASSunto', $ip, $original);
 
if (file_put_contents($copia, $string) === false){
    echo "Erro ao gravar no arquivo ". $copia;
} else {
    echo "Operação realizada com sucesso.";
}
 
?>

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