<?
$i = 65;
$s = pack("l", $i);
echo strlen($s) . "\n";
echo "***$s***\n";
?>
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4 ***A*** // This is "\0\0\0A"
Chris wrote:
Are you trying read the string '\0\0\0\0x41' from a file? or are you trying to read these 4 bytes from a file: 00000041 ?
If the latter:
The pack and unpack functions are designed to do this (and more). You could also manually do it yourself with something like this:
$sBuff = "\0\0\0\0x41"; // Read the data into a var
$iAnswer = ord($sBuff{0}) | ord($sBuff{1}) << 8 | ord($sBuff{2}) << 16 | ord($sBuff{3}) << 24;
// Get the numerical value of each byte, then shift the bytes to get the 4 byte number. (Little Endian)
Chris
Julio Sergio Santana wrote:
I'm just starting with PHP, and I've been browsing the whole manual to find how to solve the following problem:
1. An integer number is internally represented in 4 bytes. Say, for instance, number 65 is represented by 0x00000041, that is the string "\0\0\0\0x41", and not the string "65".
2. How can I write this representation into a file and then read back it from the file?
Do you have any idea about this?
Thank you,
Sergio.
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