- base_convert: documentation ( source)
- strcmp: documentation ( source)
<?php
$val = 2;
$fbase = 10;
$tbase = 16;
$newbase = 16;
if (strcmp($val, base_convert($val, $fbase, $tbase))) {
echo "$val isn't purely in base $tbase";
} else {
$newval = base_convert($val, $base, $newbase);
echo "new val is $newval";
}