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efrain |
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<?php declare(strict_types=1);
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namespace Invoker\ParameterResolver;
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use ReflectionException;
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use ReflectionFunctionAbstract;
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/**
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* Finds the default value for a parameter, *if it exists*.
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*/
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class DefaultValueResolver implements ParameterResolver
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{
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public function getParameters(
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ReflectionFunctionAbstract $reflection,
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array $providedParameters,
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array $resolvedParameters
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): array {
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$parameters = $reflection->getParameters();
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// Skip parameters already resolved
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if (! empty($resolvedParameters)) {
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$parameters = array_diff_key($parameters, $resolvedParameters);
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}
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foreach ($parameters as $index => $parameter) {
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\assert($parameter instanceof \ReflectionParameter);
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if ($parameter->isDefaultValueAvailable()) {
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try {
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$resolvedParameters[$index] = $parameter->getDefaultValue();
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} catch (ReflectionException $e) {
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// Can't get default values from PHP internal classes and functions
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}
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} else {
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$parameterType = $parameter->getType();
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if ($parameterType && $parameterType->allowsNull()) {
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$resolvedParameters[$index] = null;
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}
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}
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}
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return $resolvedParameters;
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}
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}
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