PHP将空数组转换为字符串

I have a function xml2array that parses my xml file to an Array. Now when I have an empty value in my xml file the function converts this to array( ) an empty array.

我有一个函数xml2array，它将我的xml文件解析为一个数组。现在，当我的xml文件中有一个空值时，该函数将其转换为array（）一个空数组。

So < test >< /test > becomes [test]=>array(), but I want that to be an empty string "".

所以 变成[test] => array（），但我希望它是一个空字符串“”。

Does anybody know how to edit my function below:

有谁知道如何编辑我的功能如下：

<?php
    function xml2array($contents, $get_attributes = 1, $priority = 'tag') {

    $parser = xml_parser_create('');
    xml_parser_set_option($parser, XML_OPTION_TARGET_ENCODING, "UTF-8");
    xml_parser_set_option($parser, XML_OPTION_CASE_FOLDING, 0);
    xml_parser_set_option($parser, XML_OPTION_SKIP_WHITE, 1);
    xml_parse_into_struct($parser, trim($contents), $xml_values);
    xml_parser_free($parser);
    if (!$xml_values)
        return; //Hmm...
    $xml_array = array ();
    $parents = array ();
    $opened_tags = array ();
    $arr = array ();
    $current = & $xml_array;
    $repeated_tag_index = array (); 
    foreach ($xml_values as $data)
    {
        unset ($attributes, $value);
        extract($data);
        $result = array ();
        $attributes_data = array ();
        if (isset ($value))
        {
            if ($priority == 'tag')
                $result = $value;
            else
                $result['value'] = $value;
        }
        if (isset ($attributes) and $get_attributes)
        {
            foreach ($attributes as $attr => $val)
            {
                if($attr == 'xsi:type') continue;
                if($attr == 'xsi:nil') continue;

                if ($priority == 'tag')
                    $attributes_data[$attr] = $val;
                else
                    $result['attr'][$attr] = $val; //Set all the attributes in a array called 'attr'
            }
        }
        if ($type == "open")
        { 
            $parent[$level -1] = & $current;
            if (!is_array($current) or (!in_array($tag, array_keys($current))))
            {
                $current[$tag] = $result;
                if ($attributes_data)
                    $current[$tag . '_attr'] = $attributes_data;
                $repeated_tag_index[$tag . '_' . $level] = 1;
                $current = & $current[$tag];
            }
            else
            {
                if (isset ($current[$tag][0]))
                {
                    $current[$tag][$repeated_tag_index[$tag . '_' . $level]] = $result;
                    $repeated_tag_index[$tag . '_' . $level]++;
                }
                else
                { 
                    $current[$tag] = array (
                        $current[$tag],
                        $result
                    ); 
                    $repeated_tag_index[$tag . '_' . $level] = 2;
                    if (isset ($current[$tag . '_attr']))
                    {
                        $current[$tag]['0_attr'] = $current[$tag . '_attr'];
                        unset ($current[$tag . '_attr']);
                    }
                }
                $last_item_index = $repeated_tag_index[$tag . '_' . $level] - 1;
                $current = & $current[$tag][$last_item_index];
            }
        }
        elseif ($type == "complete")
        {
            if (!isset ($current[$tag]))
            {
                $current[$tag] = $result;
                $repeated_tag_index[$tag . '_' . $level] = 1;
                if ($priority == 'tag' and $attributes_data)
                    $current[$tag . '_attr'] = $attributes_data;
            }
            else
            {
                if (isset ($current[$tag][0]) and is_array($current[$tag]))
                {
                    $current[$tag][$repeated_tag_index[$tag . '_' . $level]] = $result;
                    if ($priority == 'tag' and $get_attributes and $attributes_data)
                    {
                        $current[$tag][$repeated_tag_index[$tag . '_' . $level] . '_attr'] = $attributes_data;
                    }
                    $repeated_tag_index[$tag . '_' . $level]++;
                }
                else
                {
                    $current[$tag] = array (
                        $current[$tag],
                        $result
                    ); 
                    $repeated_tag_index[$tag . '_' . $level] = 1;
                    if ($priority == 'tag' and $get_attributes)
                    {
                        if (isset ($current[$tag . '_attr']))
                        { 
                            $current[$tag]['0_attr'] = $current[$tag . '_attr'];
                            unset ($current[$tag . '_attr']);
                        }
                        if ($attributes_data)
                        {
                            $current[$tag][$repeated_tag_index[$tag . '_' . $level] . '_attr'] = $attributes_data;
                        }
                    }
                    $repeated_tag_index[$tag . '_' . $level]++; //0 and 1 index is already taken
                }
            }
        }
        elseif ($type == 'close')
        {
            $current = & $parent[$level -1];
        }
    }

    return ($xml_array);
}

?>

？>

4 个解决方案

#1

Just check your source array using empty: http://php.net/empty and return "" is empty() returned true. Add this at the begining of your function:

只需使用空检查源数组：http：//php.net/empty并返回“”为空（）返回true。在函数开头添加：

if( empty($myArray) ) {
   return '';
}

#2

use empty function to check if array is empty or not

使用空函数检查数组是否为空

return empty($xml_array)?"":$xml_array;

return empty（$ xml_array）？“”：$ xml_array;

$parser = xml_parser_create(''); xml_parser_set_option($parser, XML_OPTION_TARGET_ENCODING, "UTF-8"); xml_parser_set_option($parser, XML_OPTION_CASE_FOLDING, 0); xml_parser_set_option($parser, XML_OPTION_SKIP_WHITE, 1); xml_parse_into_struct($parser, trim($contents), $xml_values); xml_parser_free($parser); if (!$xml_values) return; //Hmm... $xml_array = array (); $parents = array (); $opened_tags = array (); $arr = array (); $current = & $xml_array; $repeated_tag_index = array (); foreach ($xml_values as $data) { unset ($attributes, $value); extract($data); $result = array (); $attributes_data = array (); if (isset ($value)) { if ($priority == 'tag') $result = $value; else $result['value'] = $value; } if (isset ($attributes) and $get_attributes) { foreach ($attributes as $attr => $val) { if($attr == 'xsi:type') continue; if($attr == 'xsi:nil') continue; if ($priority == 'tag') $attributes_data[$attr] = $val; else $result['attr'][$attr] = $val; //Set all the attributes in a array called 'attr' } } if ($type == "open") { $parent[$level -1] = & $current; if (!is_array($current) or (!in_array($tag, array_keys($current)))) { $current[$tag] = $result; if ($attributes_data) $current[$tag . '_attr'] = $attributes_data; $repeated_tag_index[$tag . '_' . $level] = 1; $current = & $current[$tag]; } else { if (isset ($current[$tag][0])) { $current[$tag][$repeated_tag_index[$tag . '_' . $level]] = $result; $repeated_tag_index[$tag . '_' . $level]++; } else { $current[$tag] = array ( $current[$tag], $result ); $repeated_tag_index[$tag . '_' . $level] = 2; if (isset ($current[$tag . '_attr'])) { $current[$tag]['0_attr'] = $current[$tag . '_attr']; unset ($current[$tag . '_attr']); } } $last_item_index = $repeated_tag_index[$tag . '_' . $level] - 1; $current = & $current[$tag][$last_item_index]; } } elseif ($type == "complete") { if (!isset ($current[$tag])) { $current[$tag] = $result; $repeated_tag_index[$tag . '_' . $level] = 1; if ($priority == 'tag' and $attributes_data) $current[$tag . '_attr'] = $attributes_data; } else { if (isset ($current[$tag][0]) and is_array($current[$tag])) { $current[$tag][$repeated_tag_index[$tag . '_' . $level]] = $result; if ($priority == 'tag' and $get_attributes and $attributes_data) { $current[$tag][$repeated_tag_index[$tag . '_' . $level] . '_attr'] = $attributes_data; } $repeated_tag_index[$tag . '_' . $level]++; } else { $current[$tag] = array ( $current[$tag], $result ); $repeated_tag_index[$tag . '_' . $level] = 1; if ($priority == 'tag' and $get_attributes) { if (isset ($current[$tag . '_attr'])) { $current[$tag]['0_attr'] = $current[$tag . '_attr']; unset ($current[$tag . '_attr']); } if ($attributes_data) { $current[$tag][$repeated_tag_index[$tag . '_' . $level] . '_attr'] = $attributes_data; } } $repeated_tag_index[$tag . '_' . $level]++; //0 and 1 index is already taken } } } elseif ($type == 'close') { $current = & $parent[$level -1]; } } return ($xml_array); 

} ?>

}？>

#3

The empty array you see is the default value you set:

您看到的空数组是您设置的默认值：

$result = array ();

You have the following alternatives:

您有以下替代方案：

1. Keep it as is - empty elements will have an empty array as value.
2. 保持原样 - 空元素将有一个空数组作为值。
3. Set to "" (empty string) - empty elements will have an empty string as value.
4. 设置为“”（空字符串） - 空元素将具有空字符串作为值。
5. Set to NULL - empty elements will be dropped if they have siblings with the same element name. Single empty elements will be preserved.
6. 设置为NULL - 如果空元素具有相同元素名称的兄弟元素，则将删除这些元素。将保留单个空元素。

Depending on your need just take the default of your choice.

根据您的需要，您可以选择默认设置。

#4

I first thought array_walk_recursive would be a great option, but it ignores empty arrays in the function call.

我首先认为array_walk_recursive是一个很好的选择，但它忽略了函数调用中的空数组。

I would create a function, something like this. It goes through an array recursively and replaces array with string. (something like this)

我会创建一个函数，就像这样。它以递归方式遍历数组并用字符串替换数组。 （像这样）

function replaceArrayToString($arr = array()) {
    $newArr = array();
    foreach($arr as $key=>$value)
    {
        if (is_array($value))
        {
           unset($arr[$key]);

            //Is it an empty array, make it a string
            if (empty($value)) {
                $newArr[$key] = '';
            }
            else {
                $newArr[$key] = replaceArrayToString($value);
            }

        }
        else {
            $newArr[$key] = $value; 
        }

    }
    return $newArr;

}

and then call it from the end of your existing function xml2array() before returning the array.

然后在返回数组之前从现有函数xml2array（）的末尾调用它。

    elseif ($type == 'close')
        {
        $current = & $parent[$level -1];
        }
    }

    $xml_array = replaceArrayToString($xml_array);
    return ($xml_array);
}