Replace all certain character except first occurrence in PHP

Question

Example

• Input = 1.1.0.1
• Expected output = 1.101

Answer 1

You could make use substr() and str_replace() fairly easily:

$str = '1.1.0.1';
$pos = strpos($str,'.');
if ($pos !== false) {
    $str = substr($str,0,$pos+1) . str_replace('.','',substr($str,$pos+1));
}
echo $str;