我使用curl方法从API获取响应。它确实返回了一个xml响应。
响应返回一组字符串，我无法获得所需的确切值。
这些是我的代码：
$url = 'someurlwithGETparameter';
$ch = curl_init();
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'GET');
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$data = curl_exec($ch);
curl_close($ch);
例如：
< foods >
< chinese > Shark Fin </ chinese>
< japanese > Sushi </ japanese>
< /foods >
我想要中国菜"鱼翅"，并把它放在一个变量中。
$chineseFood = $somethinglike['chinese'];
所以当我回应$chineseFood时，我会得到"鱼翅"。
请帮忙。今天刚开始CURL，我对CURL 不是很熟悉
非常感谢=）
这不是一个curl问题，这是一个解析XML的问题，这就是API通过其外观返回的内容。一个简单的解决方案是使用PHP提供的标准XML解析器之一：
- SimpleXML
- Dom分析器
PHP提供了更多（请参阅手册中的这一页），但这两个就足够了。简单的xml解析器正是它所说的。一个简单的解析器。它可以处理基本的内容，但当使用名称空间和其他"复杂"内容的XML被输入其中时，它就不那么理想了。DOM解析器基本上可以处理您想要的所有内容。
在您的特定情况下，curl_exec将返回这个XML。如果是这样的话，你可以沿着以下路线做一些事情：
// all curl stuff here
$xmlString = curl_exec($ch);
$XmlElement = new SimpleXMLElement($xmlString);
$chineseFoods = $XmlElement->chinese;
您可以直接调用$XmlElement->chinese，因为食物将被解释为XML"文档"的根节点
从未使用过SimpleXML，我无法评论如何使用或它有多简单，但正如@hoppa所提到的，您可以使用围绕DOMDocument 构建的内置Dom解析函数
$food=array();
$data="
<foods>
<chinese foodtype='soup'>Shark Fin</chinese>
<japanese foodtype='fish'>Sushi</japanese>
<italian foodtype='wheat'>Pasta</italian>
<british foodtype='delicious'>fish n chips</british>
</foods>";
/* Try to prevent errors from being displayed */
libxml_use_internal_errors( true );
/* Create the reference to the DOMDocument and set some properties */
$dom=new DOMDocument;
$dom->validateOnParse=false;
$dom->standalone=true;
$dom->preserveWhiteSpace=true;
$dom->strictErrorChecking=false;
$dom->substituteEntities=false;
$dom->recover=true;
$dom->formatOutput=false;
/* Load the XML data */
$dom->loadXML( $data );
$parse_errs=serialize( libxml_get_last_error() );
libxml_clear_errors();
/* Get the root node and then iterate through it's children */
$foods=$dom->getElementsByTagName('foods')->item(0);
foreach( $foods->childNodes as $i => $node ) {
if( $node->nodeType==XML_ELEMENT_NODE ){
/* Elements can have attributes, use this methodology to find and get attributes */
$foodtype=$node->hasAttribute('foodtype') ? $node->getAttribute('foodtype') : '';
/* Do whatever you want with the tag or data etc */
echo $node->tagName.' '.$node->nodeValue.' '.$foodtype.BR;
/* You could store in an array for later use for example */
$food[ $node->tagName ]=(object)array( 'type'=>$foodtype, 'value'=>$node->nodeValue );
}
}
$dom=null;
/* Later on.... */
$type='chinese';
echo 'From the array: '.$food[ $type ]->type.' '.$food[ $type ]->value;
在DOM中，您可以使用Xpath来获取特定的值和节点：
$xml = <<<'XML'
<foods>
<chinese foodtype='soup'>Shark Fin</chinese>
<japanese foodtype='fish'>Sushi</japanese>
<italian foodtype='wheat'>Pasta</italian>
<british foodtype='delicious'>fish n chips</british>
</foods>
XML;
$document = new DOMDocument();
$document->loadXml($xml);
$xpath = new DOMXpath($document);
var_dump(
// the text content of an element node
$xpath->evaluate('string(/foods/chinese)'),
// the value of an attribute node
$xpath->evaluate('string(/foods/chinese/@foodtype)')
);
输出：
string(9) "Shark Fin"
string(4) "soup"
如果结果没有转换为标量（字符串、数字、布尔值），它将始终是一个节点列表，您可以使用foreach进行迭代：
foreach ($xpath->evaluate('/foods/*[@foodtype = "fish"]') as $food) {
var_dump(
[
'name' => $food->textContent,
'group' => $food->localName,
'type' => $food->getAttribute('foodtype')
]
);
}
输出：
array(3) {
["name"]=>
string(5) "Sushi"
["group"]=>
string(8) "japanese"
["type"]=>
string(4) "fish"
}
返回的对象是DOMNode实例，实际的类取决于节点类型。
请尝试执行以下代码段来分析XML文档。
<?php
/**
* xml2array() will convert the given XML text to an array in the XML structure.
* Link: http://www.bin-co.com/php/scripts/xml2array/
* Arguments : $contents - The XML text
* $get_attributes - 1 or 0. If this is 1 the function will get the attributes as well as the tag values - this results in a different array structure in the return value.
* $priority - Can be 'tag' or 'attribute'. This will change the way the resulting array sturcture. For 'tag', the tags are given more importance.
* Return: The parsed XML in an array form. Use print_r() to see the resulting array structure.
* Examples: $array = xml2array(file_get_contents('feed.xml'));
* $array = xml2array(file_get_contents('feed.xml', 1, 'attribute'));
*/
function xml2array($contents, $get_attributes=1, $priority = 'tag') {
if(!$contents) return array();
if(!function_exists('xml_parser_create')) {
//print "'xml_parser_create()' function not found!";
return array();
}
//Get the XML parser of PHP - PHP must have this module for the parser to work
$parser = xml_parser_create('');
xml_parser_set_option($parser, XML_OPTION_TARGET_ENCODING, "UTF-8"); # http://minutillo.com/steve/weblog/2004/6/17/php-xml-and-character-encodings-a-tale-of-sadness-rage-and-data-loss
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...
//Initializations
$xml_array = array();
$parents = array();
$opened_tags = array();
$arr = array();
$current = &$xml_array; //Refference
//Go through the tags.
$repeated_tag_index = array();//Multiple tags with same name will be turned into an array
foreach($xml_values as $data) {
unset($attributes,$value);//Remove existing values, or there will be trouble
//This command will extract these variables into the foreach scope
// tag(string), type(string), level(int), attributes(array).
extract($data);//We could use the array by itself, but this cooler.
$result = array();
$attributes_data = array();
if(isset($value)) {
if($priority == 'tag') $result = $value;
else $result['value'] = $value; //Put the value in a assoc array if we are in the 'Attribute' mode
}
//Set the attributes too.
if(isset($attributes) and $get_attributes) {
foreach($attributes as $attr => $val) {
if($priority == 'tag') $attributes_data[$attr] = $val;
else $result['attr'][$attr] = $val; //Set all the attributes in a array called 'attr'
}
}
//See tag status and do the needed.
if($type == "open") {//The starting of the tag '<tag>'
$parent[$level-1] = &$current;
if(!is_array($current) or (!in_array($tag, array_keys($current)))) { //Insert New tag
$current[$tag] = $result;
if($attributes_data) $current[$tag. '_attr'] = $attributes_data;
$repeated_tag_index[$tag.'_'.$level] = 1;
$current = &$current[$tag];
} else { //There was another element with the same tag name
if(isset($current[$tag][0])) {//If there is a 0th element it is already an array
$current[$tag][$repeated_tag_index[$tag.'_'.$level]] = $result;
$repeated_tag_index[$tag.'_'.$level]++;
} else {//This sectio$data = cn will make the value an array if multiple tags with the same name appear together
$current[$tag] = array($current[$tag],$result);//This will combine the existing item and the new item together to make an array
$repeated_tag_index[$tag.'_'.$level] = 2;
if(isset($current[$tag.'_attr'])) { //The attribute of the last(0th) tag must be moved as well
$current[$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($type == "complete") { //Tags that ends in 1 line '<tag />'
//See if the key is already taken.
if(!isset($current[$tag])) { //New Key
$current[$tag] = $result;
$repeated_tag_index[$tag.'_'.$level] = 1;
if($priority == 'tag' and $attributes_data) $current[$tag. '_attr'] = $attributes_data;
} else { //If taken, put all things inside a list(array)
if(isset($current[$tag][0]) and is_array($current[$tag])) {//If it is already an array...
// ...push the new element into that array.
$current[$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 { //If it is not an array...
$current[$tag] = array($current[$tag],$result); //...Make it an array using using the existing value and the new value
$repeated_tag_index[$tag.'_'.$level] = 1;
if($priority == 'tag' and $get_attributes) {
if(isset($current[$tag.'_attr'])) { //The attribute of the last(0th) tag must be moved as well
$current[$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') { //End of tag '</tag>'
$current = &$parent[$level-1];
}
}
return($xml_array);
}
$response_array=xml2array($response);
curl响应的信息可以很容易地从响应数组变量中检索到。