PHP字符串格式：大写的前三个字母，添加连字符，并为strpos（）匹配的下一个单词的首字母大写

Question

I'm attempting to consistently format a list of strings that were inconsistently uploaded into the database and will likely continue to be poorly formatted. I have a check for strings that begin with "us" or "usw":

if (strpos($string, 'us') !== false ||
    strpos($string, 'usw' !== false)
    ) {
    // Format string so that the us/usw are uppercase and there is a hyphen after. 
    // Sample strings: ussetup, uswadmin, Uswonsite, etc.
    // Ideal return for above: US-Setup, USW-Admin, USW-Onsite...
}

Some are Us/Usw or us/usw, but all just need to be uppercase, followed by a hyphen and the first letter of the next word capitalized. I'm not very familiar with parsing and formatting strings in PHP, so any help would be greatly appreciated!

Answer 1

You could maybe go for preg_replace_callback , like this:

$string = "uswsetup"; // example input string
$result = preg_replace_callback("/^(usw?)-?(.)/mi", function ($m) {
    return strtoupper("$m[1]-$m[2]");
}, $string); 

echo $result; // USW-Setup

Answer 2

function formatString($s)
{
    $s_low = strtolower($s) ; // full string in lower case

    if( substr($s_low, 0, 3) == 'usw' )
        return 'USW-' . ucfirst(substr($s_low, 3)) ;
    elseif( substr($s_low, 0, 2) == 'us' )
        return 'US-' . ucfirst(substr($s_low, 2));
}

This function will return the second part in lowercase, except for the first letter. If you want to keep it intact, just replace $s_low per $s in the substring parts.