Question

How to check if a string is title case in PHP

Answer 1

function is_title_case(string $s): bool {
    $newWord = true;

    // Iterate through each character
    for ($i = 0; $i < strlen($s); $i++) {
        $ch = $s[$i];

        if (ctype_space($ch)) {
            $newWord = true;
        } else {
            if ($newWord) {
                if (!ctype_upper($ch)) {
                    return false;
                }
                $newWord = false;
            } else {
                if (!ctype_lower($ch)) {
                    return false;
                }
            }
        }
    }

    return true;
}

// Test cases
$tests = [
    "Hello World",
    "Hello world",
    "hello World",
    "Php Web Language",
    "This Is Fine",
    "This is Not Fine"
];

foreach ($tests as $t) {
    echo "\"$t\" -> " . (is_title_case($t) ? "true" : "false") . PHP_EOL;
}



/*
run:

"Hello World" -> true
"Hello world" -> false
"hello World" -> false
"Php Web Language" -> true
"This Is Fine" -> true
"This is Not Fine" -> false

*/

 

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