首页 > 解决方案 > PHP类中的双花括号-如何使用它们从2个字符串生成随机字符串并返回值?

问题描述

我偶然发现了一个脚本,它从数组中的两种不同类型的单词生成随机名称。代码如下:

    protected static $techTerms = array('AddOn', 'Algorithm', 'Architect', 'Array', 'Asynchronous', 'Avatar', 'Band', 'Base', 'Beta', 'Binary');

    protected static $culinaryTerms = array('Appetit', 'Bake', 'Beurre', 'Bistro', 'Blend', 'Boil', 'Bouchees', 'Brew', 'Buffet', 'Caffe', 'Caffeine', 'Cake');

    protected static $companyNameFormats = array(
        '{{techTerm}}{{culinaryTerm}}',
        '{{techTerm}}{{techTerm}}',
        '{{culinaryTerm}}{{techTerm}}'
    );

    public static function techTerm()
    {
        return static::randomElement(static::$techTerms);
    }

    public static function culinaryTerm()
    {
        return static::randomElement(static::$culinaryTerms);
    }

    public function companyName()
    {
        $format = static::randomElement(static::$companyNameFormats);

        return $this->generator->parse($format);
    }

基本上,脚本应该创建并返回$companyNameFormats. 这个脚本需要 Faker\Factory,但我想让它独立。此时,有2个问题:

randomElement作为一个未定义的方法,并且generator->parse作为Call to a member function parse() on null

我已设法修改脚本并使其工作,但我对如何使用给出的 {{}}$companyNameFormats 并返回结果而不使用外部库感兴趣?

修改后的脚本如下:

    protected static function companyNameFormats()
    {
        $techArray = [];
        $techArray[] = self::techTerm();
        $culinaryArray = [];
        $culinaryArray[] = self::culinaryTerm();

        $result = array(
            array_merge($techArray, $culinaryArray),
            array_merge($techArray, $culinaryArray),
            array_merge($culinaryArray, $techArray),
            array_merge($techArray, $culinaryArray),
            array_merge($culinaryArray, $techArray)
        );

        return $result;
    }

    public static function techTerm()
    {
        $techTermKey = array_rand(static::$techTerms, 1);
        $techTermValue = static::$techTerms[$techTermKey];

        return $techTermValue;
    }

    public static function culinaryTerm()
    {
        $culinaryTermsKey = array_rand(static::$culinaryTerms, 1);
        $culinaryTermsValue = static::$culinaryTerms[$culinaryTermsKey];

        return $culinaryTermsValue;
    }

    public function companyName()
    {
        $companyNameKey = array_rand(static::companyNameFormats(), 1);
        $companyNameValue = static::companyNameFormats()[$companyNameKey];

        return $companyNameValue;
    }

标签: phprandomgeneratorcurly-braces

解决方案


他们可能正在做类似的事情preg_replace

快速而肮脏的例子:

class Foo {

protected static array $foods = ["Pie", "Cake", "Yoghurt"];
protected static array $animals = ["Dog", "Cat", "Giraffe"];

protected static array $formats = [
    "{{food}} {{animal}}", 
    "{{animal}} {{food}}"
];

public function get():string{
    $format = $this->getRandomElement(self::$formats);

    
    $format = preg_replace(
        "/{{animal}}/",
        $this->getRandomElement(self::$animals),
        $format
    );
    
    return preg_replace(
        "/{{food}}/",
        $this->getRandomElement(self::$foods),
        $format
    );
}

protected function getRandomElement(array $elements):string{
    return $elements[random_int(0, count($elements) - 1)];
}
}

echo (new Foo())->get(); // Cat Yoghurt

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