The underscore before the Php constructor construct is a double underscore-PHP Tutorial-php.cn

The underscore before the Php constructor construct is a double underscore

怪我咯

Release： 2023-03-12 19:52:02

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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)

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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];
?>

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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() 
{}

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