Delete only one phrase from a file using php

Question

I want to delete just one phrase from everywhere it appears in the file, has some function that does this, something that can help me or that is impossible. I tried, but all I got was a headache.

Answer 1

$caminho = 'caminho/do/arquivo.txt';
$conteudo = file_get_contents($caminho);
file_put_contents($caminho, str_replace('trocar isto', 'por isto', $conteudo));