Home > Article > Backend Development > The underscore before the Php constructor construct is a double underscore
The underscore before the Php constructor construct is a double underscore
- 怪我咯Original
- 2017-07-06 09:55:382100browse
When I write PHP classes recently, I always encounter the error of function non object. I know that the class is not instantiated, but I just don’t know where the error is.
Definition and usage
construct() function creates a new SimpleXMLElement object.
If successful, the function returns an object. On failure, returns false.
Syntax
construct(data,options,is_url,ns,is_prefix)
| Parameters | Description |
|---|---|
| data | Required. A well-formed XML string or the path or URL of an XML document. |
| options | Optional. Specifies additional Libxml parameters. |
| is_url | Optional. Specifies whether the data parameter is a URL. The default is false. |
| ns | Optional. |
| is_prefix | Optional. |
Return value
Returns a SimpleXMLElement object representing the data.
Example
<?php $xmlstring = <<<XML <?xml version="1.0" encoding="ISO-8859-1"?> <note> <to>George</to> <from>John</from> <heading>Reminder</heading> <body>Don't forget the meeting!</body> </note> XML; $xml = new SimpleXMLElement($xmlstring); echo $xml->body[0]; ?>
Output similar to:
Don't forget the meeting!
后来看construct的前_是一个，我靠，上次也是这个错误，忘了，现在记着了
function construct()
{}
不是
function _construct()
{}The above is the detailed content of The underscore before the Php constructor construct is a double underscore. For more information, please follow other related articles on the PHP Chinese website!
Statement：
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Previous article：Detailed explanation of the usage of PHP constructor and destructorNext article：Detailed explanation of the usage of PHP constructor and destructor