CRC32 - always returns a signed int? 1

[SCelia]

No matter what value I give for crc32() I end up with an integer that could be stored in a signed int column in a mysql database. Is there a way to find out if this would always be the case? Celia

 

[SCelia]

I suspect so because I just ran this program and it didn't find any out of range values.

<?

$e = 0;

for($i=0; $i < 1000000; $i++) {

$str = rand(1,999).'.'.rand(1,999).'.'.rand(1,999).'.'.rand(1,999);

if (crc32($str) > 2147483647 || crc32($str) < -2147483648) {
echo &quot;Out of range for an integer $str&quot;;
$e++;
}
}

echo &quot;Done with $e out of range values&quot;;

?> Celia

 

[sleipnir214]

uh, RTFM?

According to

http://www.php.net/manual/en/function.crc32.php

, &quot;Generates the cyclic redundancy checksum polynomial of 32-bit lengths of the str[ing]&quot;. Want the best answers? Ask the best questions:

http://www.tuxedo.org/~esr/faqs/smart-questions.html

TANSTAAFL!

 

[SCelia]

32 bit length is 4 bytes or an int? Celia

 

[sleipnir214]

Last time I checked, MySQL's &quot;int&quot; columntype was 4 bytes. Want the best answers? Ask the best questions:

http://www.tuxedo.org/~esr/faqs/smart-questions.html

TANSTAAFL!

 

[SCelia]

Yep, I should know, I've had this page open on my computer over the last few days:

http://www.mysql.com/doc/en/Storage_requirements.html

Celia

 

[SCelia]

I had to go look up &quot;RTFM&quot; at the link you put in your sig. I read the manual actually before I even tested the function, but I was idiot enough not to see the 32-bit thing. Thanks for pointing it out. Celia