Usage of PHP Type Hinting

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言語学習のためのミニ勉強会 at 株式会社ベーシック

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1. Usage of PHP Type Hinting @hashihama variable constant
2. function calculateSpeed(int $distance, int $time) { return $distance / $time; /* ex) 12.3 */ } With Argument function isAdminLoggedIn(): bool { return currentUser()->role === ‘admin’; /* ex) true */ } With Returned Value function sayHello(): void { echo ‘Hello’; } // returns nothing class { private Foo $foo; } With Property
3. function add(int $a, int $b): int { return $a + $b; } add(1.0, 2.0); // 3 Strict Type Union Type <?php declare(strict_types=1); function add(int $a, int $b): int { return $a + $b; } add(1.0, 2.0); // TypeError! float given ?string int|float iterable string or null int or float array or Traversable 8.0 avoids type conversion accepts multiple types