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因此，如果我们想确保标量类型，类型检查类是唯一的机会。

警告：非严格标量不会将null转换，它将保持为null。

<?php
use Granam\Strict\Scalar\StrictScalar;
use Granam\Strict\Scalar\Exceptions\WrongParameterType;

$scalar = new StrictScalar('foo');

// foo
echo $scalar;

$nullScalar = new StrictScalar(null, false /* suppressed strictness */);
// false
echo is_scalar($nullScalar->getValue());
// true
echo is_null($nullScalar->getValue());

try {
  new StrictScalar(null);
} catch (WrongParameterType $scalarException) {
  // Strict scalar has to get a scalar value. Null is not a scalar.
  die('Something get wrong: ' . $scalarException->getMessage());
}

granam / strict-scalar

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