function dec2bin ($dec) {
$flag = array();
while ($dec != 0) {
array_push($flag,$dec%2);
$dec = (int)($dec/2);
}
$binstr = '';
while (!empty($flag)) {
$binstr .= array_pop($flag);
}
return $binstr;
}
echo dec2bin(7);Note: The above is just for practice. PHP already has built-in functions decbin() and base_convert();
echo '<br/>'; echo base_convert(7,10,2); echo '<br/>'; echo base_convert(1111,2,8); echo '<br/>'; echo decbin(6);
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