Question

How to check if lowercase and uppercase characters in a string are in same order with PHP

Answer 1

function lowercase_uppercase_characters_same_order($s) { 
    $len = strlen($s);
    $lower_s = ""; 
    $upper_s = ""; 

    for ($i = 0; $i < $len; $i++) { 
        if ($s[$i] >= 'A' && $s[$i] <= 'Z') {
            $upper_s = $upper_s . $s[$i];
        }
        if ($s[$i] >= 'a' && $s[$i] <= 'z') {
            $lower_s = $lower_s . $s[$i];
        }
    } 
    return strtoupper($lower_s) == $upper_s; 
} 

 
$s = "pPHhpP"; // phpPHP

if (lowercase_uppercase_characters_same_order($s)) {
     echo "Yes"; 
}
else {
     echo "No"; 
}
 

        
 
/*
run:
             
Yes
      
*/

 

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