递归匿名函数手动实现 http_build_query 系统函数 php

最近觉得 http_build_query 函数的功能蛮神奇的。可以将任意一个复杂数组转换成一个复杂的 URL 查询字符串。于是自己尝试手动实现了一下(user_http_build_query)。

版本一、主函数递归额外辅助函数实现

/** * http_build_query 的实现。 * * @paramarray$queryPayload * @paramstring$numericPrefix * @paramstring$argSeparator * @paramint$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 => $v) { // 特殊值处理 if ($v === null) { continue; } if ($v === 0 || $v === false) { $v = '0'; }// 为了对数据进行解码时获取合法的变量名 if (is_numeric($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($argSeparator)); }/** * 转换值是非标量的情况 * * @paramstring$key * @paramarray|object$value * @paramstring$argSeparator * @paramint$encType * * @return string */ function to_query_str(string $key, $value, string $argSeparator, int $encType): string { $queryStr = ''; foreach ($value as $k => $v) { // 特殊值处理 if ($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; }

版本二、单函数递归匿名函数实现

用两个函数去实现一个函数的功能，显然是不太满意的。稍微改动一下，提取辅助函数为匿名函数到主函数内部，递归匿名函数就可以了。

/** * http_build_query 的实现。 * * @paramarray$queryPayload * @paramstring$numericPrefix * @paramstring$argSeparator * @paramint$encType * * @return string */ function user_http_build_query(array $queryPayload, string $numericPrefix = '', string $argSeparator = '&', int $encType = PHP_QUERY_RFC1738): string { /** * 转换值是非标量的情况 * * @paramstring$key * @paramarray|object$value * @paramstring$argSeparator * @paramint$encType * * @return string */ $toQueryStr = static function (string $key, $value, string $argSeparator, int $encType) use (&$toQueryStr): string{ $queryStr = ''; foreach ($value as $k => $v) { // 特殊值处理 if ($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 => $v) { // 特殊值处理 if ($v === null) { continue; } if ($v === 0 || $v === false) { $v = '0'; }// 为了对数据进行解码时获取合法的变量名 if (is_numeric($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)); }

测试

$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

原文链接