PHP Functions Essential Reference

dechex

string dechex(int dec) 

Returns the hexadecimal notation for the given decimal argument.

Returns:

String representation of a hexadecimal number

Description:

Converts a decimal number into a hexadecimal number represented as a string. The largest decimal value that can be converted is 2147483647.

Version:

PHP 3, PHP 4

See also:

base_convert() 
bindec() 
decbin() 
hexdec() 
decoct() 
octdec() 

Example:

Get the hexadecimal representation of a number

$dec = "54321"; echo "The hexadecimal of $dec is ", dechex($dec);