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。
*
* @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 => $v) {
// 特殊值处理
if ($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
*
* @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 => $v) {
// 特殊值处理
if ($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。
*
* @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
{
/**
* 转换值是非标量的情况
*
* @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 => $v) {
// 特殊值处理
if ($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
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