Efficient file writing?

[Anon]

What is the most efficient way of opening a file, reading all the contents and writing all back into another file? I use but what happens when you need to use it during a function?

$fd = fopen ("file.php.reference", "r");
while (!feof ($fd)) {
$buffer = fgets($fd, 4096);
$fp = fopen ("file.php.refz", "w");
fwrite ($fp, $buffer);
}
fclose ($fd);
fclose ($fp);

[simon_belak]

well at first i wouldn't open the 2nd file insida a loop but before the loop with the a parameter (append). Or you could simply try to call a system command and redirect output from one file to another one.

[toma42]

How large are your files? A pretty easy way to read one file then append to another would be

error_log('appending.txt', 3, implode('', file('reading.txt')));

Dunno just how efficent that is or if you need to change the implode to implode("\n"...
, but it's tight and clean if the reading file is small.

[Anon]

Probably using a system call to the OS.

[josephferris]

If you aren't making any changes to the file, use the copy function provided in PHP. The syntax is:

int copy (string source, string dest)