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- <?php
- /*
- * By adding type hints and enabling strict type checking, code can become
- * easier to read, self-documenting and reduce the number of potential bugs.
- * By default, type declarations are non-strict, which means they will attempt
- * to change the original type to match the type specified by the
- * type-declaration.
- *
- * In other words, if you pass a string to a function requiring a float,
- * it will attempt to convert the string value to a float.
- *
- * To enable strict mode, a single declare directive must be placed at the top
- * of the file.
- * This means that the strictness of typing is configured on a per-file basis.
- * This directive not only affects the type declarations of parameters, but also
- * a function's return type.
- *
- * For more info review the Concept on strict type checking in the PHP track
- * <link>.
- *
- * To disable strict typing, comment out the directive below.
- */
- declare(strict_types=1);
- function buildLetters(): array {
- $letters = [];
- $base = ord('A');
- for ($i = 0; $i <= 25; $i++) {
- $letters[chr($base+$i)] = TRUE;
- }
- return $letters;
- }
- function isPangram(string $string): bool {
- $letters = buildLetters();
- foreach (mb_str_split(mb_strtoupper($string)) as $letter) {
- unset($letters[$letter]);
- }
- return empty($letters);
- }
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