Need to change case of a string - PHP

Question

$variable = "test_company_insurance_llc_chennai_limited_w-8tyu.pdf";

I need to display above the $variable like

Test Company Insurance LLC Chennai Limited W-8TYU.pdf

For that I've done:

$variable = str_replace("_"," ","test_company_insurance_llc_chennai_limited_w-8tyu.pdf");

$test  = explode(" ", $variable);
$countof = count($test);

for ($x=0; $x<$countof; $x++) {

    if($test[$x] == 'w-8tyu' || $test[$x] == 'llc') {
       $test[$x] = strtoupper($test[$x]);
       //todo
    }   

} 

I've got stuck in the to-do part.

I will change the specific words to uppercase using strtoupper.

Later, how should I need to merge the array?

Any help will be thankful...

Answer 1

$str_in = "test_company_insurance_llc_chennai_limited_w-8tyu.pdf";
$lst_in = explode("_", $str_in);
$lst_out = array();
foreach ($lst_in as $val) {
    switch($val) {
        case "llc"          : $lst_out[] = strtoupper($val);
                              break;
        case "w-8tyu.pdf"   : $lst_temp = explode('.', $val);
                              $lst_out[] = strtoupper($lst_temp[0]) . "." . $lst_temp[1];
                              break;
        default             : $lst_out[] = ucfirst($val);
    }
}
$str_out = implode(' ', $lst_out);
echo $str_out;