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Definition
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Resolver
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File: EnvironmentVariableResolver.php
<?php declare(strict_types=1); namespace DI\Definition\Resolver; use DI\Definition\Definition; use DI\Definition\EnvironmentVariableDefinition; use DI\Definition\Exception\InvalidDefinition; /** * Resolves a environment variable definition to a value. * * @author James Harris <james.harris@icecave.com.au> */ class EnvironmentVariableResolver implements DefinitionResolver { /** * @var DefinitionResolver */ private $definitionResolver; /** * @var callable */ private $variableReader; public function __construct(DefinitionResolver $definitionResolver, $variableReader = 'getenv') { $this->definitionResolver = $definitionResolver; $this->variableReader = $variableReader; } /** * Resolve an environment variable definition to a value. * * @param EnvironmentVariableDefinition $definition */ public function resolve(Definition $definition, array $parameters = []) { $value = call_user_func($this->variableReader, $definition->getVariableName()); if (false !== $value) { return $value; } if (!$definition->isOptional()) { throw new InvalidDefinition(sprintf( "The environment variable '%s' has not been defined", $definition->getVariableName() )); } $value = $definition->getDefaultValue(); // Nested definition if ($value instanceof Definition) { return $this->definitionResolver->resolve($value); } return $value; } public function isResolvable(Definition $definition, array $parameters = []) : bool { return true; } }