Overwrite Line in File with PHP

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If the file is really big (log files or something like this) and you are willing to sacrifice speed for memory consumption you could open two files and essentially do the trick Jeremy Ruten proposed by using files instead of system memory. 

$source="in.txt";
$target="out.txt";

// copy operation
$sh=fopen($source, 'r');
$th=fopen($target, 'w');
while (!feof($sh)) {
    $line=fgets($sh);
    if (strpos($line, '@parsethis')!==false) {
        $line="new line to be inserted" . PHP_EOL;
    }
    fwrite($th, $line);
}

fclose($sh);
fclose($th);

// delete old source file
unlink($source);
// rename target file to source file
rename($target, $source);

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