关于php:递归匿名函数手动实现-httpbuildquery-系统函数

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最近感觉 http_build_query 函数的性能蛮神奇的。能够将任意一个简单数组转换成一个简单的 URL 查问字符串。于是本人尝试手动实现了一下 (user_http_build_query)。

/**
 * http_build_query 的实现。*
 * @param  array  $queryPayload
 * @param  string  $numericPrefix
 * @param  string  $argSeparator
 * @param  int  $encType
 *
 * @return string
 */
function user_http_build_query(array $queryPayload, string $numericPrefix = '', string $argSeparator ='&', int $encType = PHP_QUERY_RFC1738): string
{reset($queryPayload);
    $queryStr = '';
    foreach ($queryPayload as $k => $v) {
        // 非凡值解决
        if ($v === null) {continue;}
        if ($v === 0 || $v === false) {$v = '0';}

        // 为了对数据进行解码时获取非法的变量名
        if (is_numeric($k) && ! is_string($k)) {$k = $numericPrefix . $k;}

        $queryStr .= is_scalar($v)
            ? sprintf("%s=%s$argSeparator", $encType === PHP_QUERY_RFC3986 ? rawurlencode($k) : urlencode($k), $encType === PHP_QUERY_RFC3986 ? rawurlencode($v) : urlencode($v))
            : to_query_str($k, $v, $argSeparator, $encType);
    }

    return substr($queryStr, 0, -strlen($argSeparator));
}

/**
 * 转换值是非标量的状况
 *
 * @param  string  $key
 * @param  array|object  $value
 * @param  string  $argSeparator
 * @param  int  $encType
 *
 * @return string
 */
function to_query_str(string $key, $value, string $argSeparator, int $encType): string
{
    $queryStr = '';
    foreach ($value as $k => $v) {
        // 非凡值解决
        if ($v === null) {continue;}
        if ($v === 0 || $v === false) {$v = '0';}

        $fullKey = "{$key}[{$k}]";
        $queryStr .= is_scalar($v)
            ? sprintf("%s=%s$argSeparator", $encType === PHP_QUERY_RFC3986 ? rawurlencode($fullKey) : urlencode($fullKey), $encType === PHP_QUERY_RFC3986 ? rawurlencode($v) : urlencode($v))
            : to_query_str($fullKey, $v, $argSeparator, $encType); // 递归调用
    }

    return $queryStr;
}

用两个函数去实现一个函数的性能，显然是不太称心的。略微改变一下，提取辅助函数为匿名函数到主函数外部，递归匿名函数就能够了。

/**
 * http_build_query 的实现。*
 * @param  array  $queryPayload
 * @param  string  $numericPrefix
 * @param  string  $argSeparator
 * @param  int  $encType
 *
 * @return string
 */
function user_http_build_query(array $queryPayload, string $numericPrefix = '', string $argSeparator ='&', int $encType = PHP_QUERY_RFC1738): string
{
    /**
     * 转换值是非标量的状况
     *
     * @param  string  $key
     * @param  array|object  $value
     * @param  string  $argSeparator
     * @param  int  $encType
     *
     * @return string
     */
    $toQueryStr = static function (string $key, $value, string $argSeparator, int $encType) use (&$toQueryStr): string{
        $queryStr = '';
        foreach ($value as $k => $v) {
            // 非凡值解决
            if ($v === null) {continue;}
            if ($v === 0 || $v === false) {$v = '0';}

            $fullKey = "{$key}[{$k}]";
            $queryStr .= is_scalar($v)
                ? sprintf("%s=%s$argSeparator", $encType === PHP_QUERY_RFC3986 ? rawurlencode($fullKey) : urlencode($fullKey), $encType === PHP_QUERY_RFC3986 ? rawurlencode($v) : urlencode($v))
                : $toQueryStr($fullKey, $v, $argSeparator, $encType); // 递归调用
        }

        return $queryStr;
    };

    reset($queryPayload);
    $queryStr = '';
    foreach ($queryPayload as $k => $v) {
        // 非凡值解决
        if ($v === null) {continue;}
        if ($v === 0 || $v === false) {$v = '0';}

        // 为了对数据进行解码时获取非法的变量名
        if (is_numeric($k) && ! is_string($k)) {$k = $numericPrefix . $k;}

        $queryStr .= is_scalar($v)
            ? sprintf("%s=%s$argSeparator", $encType === PHP_QUERY_RFC3986 ? rawurlencode($k) : urlencode($k), $encType === PHP_QUERY_RFC3986 ? rawurlencode($v) : urlencode($v))
            : $toQueryStr($k, $v, $argSeparator, $encType);
    }

    return substr($queryStr, 0, -strlen($argSeparator));
}

$queryPayload = [
     1 => 'a',
     '10' => 'b',
     '01' => 'c',
     'keyO1' => null,
     'keyO2' => false,
     'keyO3' => true,
     'keyO4' => 0,
     'keyO5' => 1,
     'keyO6' => 0.0,
     'keyO7' => 0.1,
     'keyO8' => [],
     'keyO9' => '','key10'=> new \stdClass(),'pastimes'=> ['golf','opera','poker','rap'],'user'=> ['name'=>'Bob Smith','age'=> 47,'sex'=>'M','dob'=>'5/12/1956'],'children'=> ['sally'=> ['age'=> 8,'sex'=> null],'bobby'=> ['sex'=>'M','age' => 12],
     ],
 ];

dd($queryStr1 = http_build_query($queryPayload),
    $queryStr2 = user_http_build_query($queryPayload),
    $queryStr3 = urldecode($queryStr1),
    $queryStr4 = urldecode($queryStr2),
    $queryStr1 === $queryStr2,
    $queryStr3 === $queryStr4,
);

// "1=a&10=b&01=c&keyO2=0&keyO3=1&keyO4=0&keyO5=1&keyO6=0&keyO7=0.1&keyO9=&pastimes%5B0%5D=golf&pastimes%5B1%5D=opera&pastimes%5B2%5D=poker&pastimes%5B3%5D=rap&user%5Bname%5D=Bob+Smith&user%5Bage%5D=47&user%5Bsex%5D=M&user%5Bdob%5D=5%2F12%2F1956&children%5Bsally%5D%5Bage%5D=8&children%5Bbobby%5D%5Bsex%5D=M&children%5Bbobby%5D%5Bage%5D=12"
// "1=a&10=b&01=c&keyO2=0&keyO3=1&keyO4=0&keyO5=1&keyO6=0&keyO7=0.1&keyO9=&pastimes%5B0%5D=golf&pastimes%5B1%5D=opera&pastimes%5B2%5D=poker&pastimes%5B3%5D=rap&user%5Bname%5D=Bob+Smith&user%5Bage%5D=47&user%5Bsex%5D=M&user%5Bdob%5D=5%2F12%2F1956&children%5Bsally%5D%5Bage%5D=8&children%5Bbobby%5D%5Bsex%5D=M&children%5Bbobby%5D%5Bage%5D=12"
// "1=a&10=b&01=c&keyO2=0&keyO3=1&keyO4=0&keyO5=1&keyO6=0&keyO7=0.1&keyO9=&pastimes[0]=golf&pastimes[1]=opera&pastimes[2]=poker&pastimes[3]=rap&user[name]=Bob Smith&user[age]=47&user[sex]=M&user[dob]=5/12/1956&children[sally][age]=8&children[bobby][sex]=M&children[bobby][age]=12"
// "1=a&10=b&01=c&keyO2=0&keyO3=1&keyO4=0&keyO5=1&keyO6=0&keyO7=0.1&keyO9=&pastimes[0]=golf&pastimes[1]=opera&pastimes[2]=poker&pastimes[3]=rap&user[name]=Bob Smith&user[age]=47&user[sex]=M&user[dob]=5/12/1956&children[sally][age]=8&children[bobby][sex]=M&children[bobby][age]=12"
// true
// true