unexpected results using sprintf() with %u

Im trying to retrieve the unsigned value of an integer. sounds pretty simple... [code] $i = -86; echo "<br>" . sprintf("%d", $i); echo "<br>" . sprintf("%u", $i); [/code] produces: -86 4294967198 what i expected: -86 86 Ive searched the archives but most of the messages refer to %s or %d... nothing in regards to %u can anyone see what im doing wrong? Im using PHP 4.3.2 TIA Cody ************************************************************************************* This e-mail, including any attachments to it, may contain confidential and/or personal information. If you have received this e-mail in error, you must not copy, distribute, or disclose it, use or take any action based on the information contained within it. Please notify the sender immediately by return e-mail of the error and then delete the original e-mail. The information contained within this e-mail may be solely the opinion of the sender and may not necessarily reflect the position, beliefs or opinions of Salmat on any issue. This email has been swept for the presence of computer viruses known to Salmat's anti-virus systems. For more information, visit our website at www.salmat.com.au. *************************************************************************************