我用了一个方式去抓一列something…之后我要解析成xml的格式
当然是可行的,但时不及会出错 于是我写下了
<code>try { $sports = new SimpleXMLElement($parsedJson); } catch (Exception $e) { Print_r($e) } </code>
结果为
<code>Warning: SimpleXMLElement::__construct(): Entity: line 1: parser error : Space required after the Public Identifier in /home/ns/www/admin/gamble/baseball.php on line 121 Warning: SimpleXMLElement::__construct(): in /home/ns/www/admin/gamble/baseball.php on line 121 Warning: SimpleXMLElement::__construct(): ^ in /home/ns/www/admin/gamble/baseball.php on line 121 Warning: SimpleXMLElement::__construct(): Entity: line 6: parser error : Opening and ending tag mismatch: hr line 5 and BODY in /home/ns/www/admin/gamble/baseball.php on line 121 Warning: SimpleXMLElement::__construct(): in /home/ns/www/admin/gamble/baseball.php on line 121 Warning: SimpleXMLElement::__construct(): ^ in /home/ns/www/admin/gamble/baseball.php on line 121 Warning: SimpleXMLElement::__construct(): Entity: line 6: parser error : Opening and ending tag mismatch: BODY line 4 and HTML in /home/ns/www/admin/gamble/baseball.php on line 121 Warning: SimpleXMLElement::__construct(): in /home/ns/www/admin/gamble/baseball.php on line 121 Warning: SimpleXMLElement::__construct(): ^ in /home/ns/www/admin/gamble/baseball.php on line 121 Warning: SimpleXMLElement::__construct(): Entity: line 7: parser error : Premature end of data in tag HEAD line 2 in /home/ns/www/admin/gamble/baseball.php on line 121 Warning: SimpleXMLElement::__construct(): in /home/ns/www/admin/gamble/baseball.php on line 121 Warning: SimpleXMLElement::__construct(): ^ in /home/ns/www/admin/gamble/baseball.php on line 121 Warning: SimpleXMLElement::__construct(): Entity: line 7: parser error : Premature end of data in tag HTML line 2 in /home/ns/www/admin/gamble/baseball.php on line 121 Warning: SimpleXMLElement::__construct(): in /home/ns/www/admin/gamble/baseball.php on line 121 Warning: SimpleXMLElement::__construct(): ^ in /home/ns/www/admin/gamble/baseball.php on line 121 </code>
我想到我之前用 curl 抓东西时,用过 json_decode
当时我用这样的方式来让程序自动重抓
<code>do{ $data = @json_decode(file_get_contents($url), true); }while($data == false); </code>
我想请教的是
如果我的 new SimpleXMLElement 失败了,我也可以用类似的方式作吗?
<code>Do { 抓资料; $data=@json_decode(something); $xml = new SimpleXMLElement($data); }while($xml == false); </code>
如果 new SimpleXMLElemen 发生以上的错误,$xml 会 等于 false吗?
求解
回复内容:
我用了一个方式去抓一列something…之后我要解析成xml的格式
当然是可行的,但时不及会出错 于是我写下了
<code>try { $sports = new SimpleXMLElement($parsedJson); } catch (Exception $e) { Print_r($e) } </code>
结果为
<code>Warning: SimpleXMLElement::__construct(): Entity: line 1: parser error : Space required after the Public Identifier in /home/ns/www/admin/gamble/baseball.php on line 121 Warning: SimpleXMLElement::__construct(): in /home/ns/www/admin/gamble/baseball.php on line 121 Warning: SimpleXMLElement::__construct(): ^ in /home/ns/www/admin/gamble/baseball.php on line 121 Warning: SimpleXMLElement::__construct(): Entity: line 6: parser error : Opening and ending tag mismatch: hr line 5 and BODY in /home/ns/www/admin/gamble/baseball.php on line 121 Warning: SimpleXMLElement::__construct(): in /home/ns/www/admin/gamble/baseball.php on line 121 Warning: SimpleXMLElement::__construct(): ^ in /home/ns/www/admin/gamble/baseball.php on line 121 Warning: SimpleXMLElement::__construct(): Entity: line 6: parser error : Opening and ending tag mismatch: BODY line 4 and HTML in /home/ns/www/admin/gamble/baseball.php on line 121 Warning: SimpleXMLElement::__construct(): in /home/ns/www/admin/gamble/baseball.php on line 121 Warning: SimpleXMLElement::__construct(): ^ in /home/ns/www/admin/gamble/baseball.php on line 121 Warning: SimpleXMLElement::__construct(): Entity: line 7: parser error : Premature end of data in tag HEAD line 2 in /home/ns/www/admin/gamble/baseball.php on line 121 Warning: SimpleXMLElement::__construct(): in /home/ns/www/admin/gamble/baseball.php on line 121 Warning: SimpleXMLElement::__construct(): ^ in /home/ns/www/admin/gamble/baseball.php on line 121 Warning: SimpleXMLElement::__construct(): Entity: line 7: parser error : Premature end of data in tag HTML line 2 in /home/ns/www/admin/gamble/baseball.php on line 121 Warning: SimpleXMLElement::__construct(): in /home/ns/www/admin/gamble/baseball.php on line 121 Warning: SimpleXMLElement::__construct(): ^ in /home/ns/www/admin/gamble/baseball.php on line 121 </code>
我想到我之前用 curl 抓东西时,用过 json_decode
当时我用这样的方式来让程序自动重抓
<code>do{ $data = @json_decode(file_get_contents($url), true); }while($data == false); </code>
我想请教的是
如果我的 new SimpleXMLElement 失败了,我也可以用类似的方式作吗?
<code>Do { 抓资料; $data=@json_decode(something); $xml = new SimpleXMLElement($data); }while($xml == false); </code>
如果 new SimpleXMLElemen 发生以上的错误,$xml 会 等于 false吗?
求解
首先,问题可能是因为xml捕获了一个非正常XML格式的数据,如果要捕获错误,可以这样
<code>/** * 解析XML格式的字符串 * * @param string $str * @return 解析正确就返回解析结果,否则返回false,说明字符串不是XML格式 */ function xml_parser($str){ $xml_parser = xml_parser_create(); if(!xml_parse($xml_parser,$str,true)){ xml_parser_free($xml_parser); return false; } else { return (json_decode(json_encode(simplexml_load_string($str)),true)); } } </code>
另外,你通过file_get_contents($url),直接抓取URL,是有可能抓不全数据的哦,这里我推荐一个HTTP请求的类:
简单而强大的HTTP请求类,来自类库:lv
http://levi.cg.am/archives/3534

php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($number))”;2、利用“~”位运算符将负数取反加一,语法“~$number + 1”。

实现方法:1、使用“sleep(延迟秒数)”语句,可延迟执行函数若干秒;2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句,可延迟执行函数若干秒和纳秒;3、使用“time_sleep_until(time()+7)”语句。

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在php中,可以使用substr()函数来读取字符串后几个字符,只需要将该函数的第二个参数设置为负值,第三个参数省略即可;语法为“substr(字符串,-n)”,表示读取从字符串结尾处向前数第n个字符开始,直到字符串结尾的全部字符。

php判断有没有小数点的方法:1、使用“strpos(数字字符串,'.')”语法,如果返回小数点在字符串中第一次出现的位置,则有小数点;2、使用“strrpos(数字字符串,'.')”语句,如果返回小数点在字符串中最后一次出现的位置,则有。


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