晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : //opt/cpanel/ea-wappspector/vendor/php-di/php-di/src/Definition/EnvironmentVariableDefinition.php
<?php

declare(strict_types=1);

namespace DI\Definition;

/**
 * Defines a reference to an environment variable, with fallback to a default
 * value if the environment variable is not defined.
 *
 * @author James Harris <james.harris@icecave.com.au>
 */
class EnvironmentVariableDefinition implements Definition
{
    /** Entry name. */
    private string $name = '';

    /**
     * @param string $variableName The name of the environment variable
     * @param bool $isOptional Whether or not the environment variable definition is optional. If true and the environment variable given by $variableName has not been defined, $defaultValue is used.
     * @param mixed $defaultValue The default value to use if the environment variable is optional and not provided
     */
    public function __construct(
        private string $variableName,
        private bool $isOptional = false,
        private mixed $defaultValue = null,
    ) {
    }

    public function getName() : string
    {
        return $this->name;
    }

    public function setName(string $name) : void
    {
        $this->name = $name;
    }

    /**
     * @return string The name of the environment variable
     */
    public function getVariableName() : string
    {
        return $this->variableName;
    }

    /**
     * @return bool Whether or not the environment variable definition is optional
     */
    public function isOptional() : bool
    {
        return $this->isOptional;
    }

    /**
     * @return mixed The default value to use if the environment variable is optional and not provided
     */
    public function getDefaultValue() : mixed
    {
        return $this->defaultValue;
    }

    public function replaceNestedDefinitions(callable $replacer) : void
    {
        $this->defaultValue = $replacer($this->defaultValue);
    }

    public function __toString() : string
    {
        $str = '    variable = ' . $this->variableName . \PHP_EOL
            . '    optional = ' . ($this->isOptional ? 'yes' : 'no');

        if ($this->isOptional) {
            if ($this->defaultValue instanceof Definition) {
                $nestedDefinition = (string) $this->defaultValue;
                $defaultValueStr = str_replace(\PHP_EOL, \PHP_EOL . '    ', $nestedDefinition);
            } else {
                $defaultValueStr = var_export($this->defaultValue, true);
            }

            $str .= \PHP_EOL . '    default = ' . $defaultValueStr;
        }

        return sprintf('Environment variable (' . \PHP_EOL . '%s' . \PHP_EOL . ')', $str);
    }
}

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