How can I use the PHP File api to write raw bytes?

Question

I want to write a raw byte/byte stream to a position in a file. This is what I have currently:

$fpr = fopen($out, 'r+');
fseek($fpr, 1); //seek to second byte
fwrite($fpr, 0x63); 
fclose($fpr);

This currently writes the actually string value of "99" starting at byte offset 1. IE, it writes bytes "9" and "9". I just want to write the actual one byte value 0x63 which happens to represent number 99.

Thanks for your time.

Answer 1

fwrite() takes strings. Try chr(0x63) if you want to write a 0x63 byte to the file.