Php get xml file content

file_get_contents

This function is similar to file() , except that file_get_contents() returns the file in a string , starting at the specified offset up to length bytes. On failure, file_get_contents() will return false .

file_get_contents() is the preferred way to read the contents of a file into a string. It will use memory mapping techniques if supported by your OS to enhance performance.

Note:

If you’re opening a URI with special characters, such as spaces, you need to encode the URI with urlencode() .

Parameters

Note:

The FILE_USE_INCLUDE_PATH constant can be used to trigger include path search. This is not possible if strict typing is enabled, since FILE_USE_INCLUDE_PATH is an int . Use true instead.

A valid context resource created with stream_context_create() . If you don’t need to use a custom context, you can skip this parameter by null .

The offset where the reading starts on the original stream. Negative offsets count from the end of the stream.

Seeking ( offset ) is not supported with remote files. Attempting to seek on non-local files may work with small offsets, but this is unpredictable because it works on the buffered stream.

Maximum length of data read. The default is to read until end of file is reached. Note that this parameter is applied to the stream processed by the filters.

Return Values

The function returns the read data or false on failure.

This function may return Boolean false , but may also return a non-Boolean value which evaluates to false . Please read the section on Booleans for more information. Use the === operator for testing the return value of this function.

Errors/Exceptions

An E_WARNING level error is generated if filename cannot be found, length is less than zero, or if seeking to the specified offset in the stream fails.

When file_get_contents() is called on a directory, an E_WARNING level error is generated on Windows, and as of PHP 7.4 on other operating systems as well.

Changelog

Version	Description
8.0.0	length is nullable now.
7.1.0	Support for negative offset s has been added.

Examples

Example #1 Get and output the source of the homepage of a website

Example #2 Searching within the include_path

// If strict types are enabled i.e. declare(strict_types=1);
$file = file_get_contents ( ‘./people.txt’ , true );
// Otherwise
$file = file_get_contents ( ‘./people.txt’ , FILE_USE_INCLUDE_PATH );
?>

Example #3 Reading a section of a file

// Read 14 characters starting from the 21st character
$section = file_get_contents ( ‘./people.txt’ , FALSE , NULL , 20 , 14 );
var_dump ( $section );
?>

The above example will output something similar to:

Example #4 Using stream contexts

// Create a stream
$opts = array(
‘http’ =>array(
‘method’ => «GET» ,
‘header’ => «Accept-language: en\r\n» .
«Cookie: foo=bar\r\n»
)
);

$context = stream_context_create ( $opts );

// Open the file using the HTTP headers set above
$file = file_get_contents ( ‘http://www.example.com/’ , false , $context );
?>

Notes

Note: This function is binary-safe.

A URL can be used as a filename with this function if the fopen wrappers have been enabled. See fopen() for more details on how to specify the filename. See the Supported Protocols and Wrappers for links to information about what abilities the various wrappers have, notes on their usage, and information on any predefined variables they may provide.

When using SSL, Microsoft IIS will violate the protocol by closing the connection without sending a close_notify indicator. PHP will report this as «SSL: Fatal Protocol Error» when you reach the end of the data. To work around this, the value of error_reporting should be lowered to a level that does not include warnings. PHP can detect buggy IIS server software when you open the stream using the https:// wrapper and will suppress the warning. When using fsockopen() to create an ssl:// socket, the developer is responsible for detecting and suppressing this warning.

See Also

• file() — Reads entire file into an array
• fgets() — Gets line from file pointer
• fread() — Binary-safe file read
• readfile() — Outputs a file
• file_put_contents() — Write data to a file
• stream_get_contents() — Reads remainder of a stream into a string
• stream_context_create() — Creates a stream context
• $http_response_header

User Contributed Notes 6 notes

file_get_contents can do a POST, create a context for that first:

$opts = array( ‘http’ =>
array(
‘method’ => ‘POST’ ,
‘header’ => «Content-Type: text/xml\r\n» .
«Authorization: Basic » . base64_encode ( » $https_user : $https_password » ). «\r\n» ,
‘content’ => $body ,
‘timeout’ => 60
)
);

$context = stream_context_create ( $opts );
$url = ‘https://’ . $https_server ;
$result = file_get_contents ( $url , false , $context , — 1 , 40000 );

Note that if an HTTP request fails but still has a response body, the result is still false, Not the response body which may have more details on why the request failed.

There’s barely a mention on this page but the $http_response_header will be populated with the HTTP headers if your file was a link. For example if you’re expecting an image you can do this:

$mimetype = null ;
foreach ( $http_response_header as $v ) if ( preg_match ( ‘/^content\-type:\s*(image\/[^;\s\n\r]+)/i’ , $v , $m )) $mimetype = $m [ 1 ];
>
>

if (! $mimetype ) // not an image
>

if the connection is
content-encoding: gzip
and you need to manually ungzip it, this is apparently the key
$c=gzinflate( substr($c,10,-8) );
(stolen from the net)

//从指定位置获取指定长度的文件内容
function file_start_length($path,$start=0,$length=null) if(!file_exists($path)) return false;
$size=filesize($path);
if($start <0) $start+=$size;
if($length===null) $length=$size-$start;
return file_get_contents($path, false, null, $start, $length );
>

I’m not sure why @jlh was downvoted, but I verified what he reported.

>>> file_get_contents($path false, null, 5, null)
=> «»
>>> file_get_contents($path, false, null, 5, 5)
=> «r/bin»

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How to Read XML Files: Getting Node & Attribute Values in XML Parsing

By now, you understand what a PHP parser is, and how to read XML files using them. You also learned about SimpleXML parser more closely. In this tutorial, we will deepen your knowledge about SimpleXML and how to read XML files successfully.

A tree structure of a document consists of nodes. Following the tree metaphor, you could call them branches. An element is a type of node. So is an attribute, which is not considered to be a child of an element, though it does hold information about it. This data is contained in quotes, which makes it a string.

By using PHP XML code examples, we will show you how to get the values of nodes and attributes. To do that, we will be using PHP simplexml_load_file() function.

Contents

How to Read XML Files: Main Tips

• SimpleXML is a tree-based parser. The tree data structure is made out of nodes.
• You can access Node and Attribute values using SimpleXML.
• To do that, you have to understand the usage of PHP simplexml_load_file function.

Example of XML File

Let’s have a look at one of our XML documents, which is called bookstore.xml . You will see it has three categories of books listed. Each category has one book in it, and the information on a particular book consists of its name, author, price, language and year of release:

 books> book category="COOK"> name lang="en">The Silver Spoon name> by>Cielia D`Onofrio by> released>1950 released> pricing>35.00 pricing> book> book category="FANTASY"> name lang="en">The Fellowship of the Ring name> by>J.R.R. Tolkien by> released>1954 released> pricing>39.99 pricing> book> book category="TECH"> name lang="en-us">Think like a programmer name> by>V. Anton Spraul by> released>2012 released> pricing>39.99 pricing> book> books>

Analyze it carefully as we will use this file to explain how to read XML files.

Retrieve Node Value from a Specific Element

Imagine we need to make our code written in PHP read the XML example we introduced in the previous section. Let’s say we want to return the titles of the first two books. The code you see below acquires the values of elements of the books we need from the books.xml file:

 $xml = simplexml_load_file('bookstore.xml') or die('Failed to create an object'); echo $xml->book[0]->name . "
"; echo $xml->book[1]->name; ?>

After this PHP XML code is executed, we get the names of the first two books outputted like this:
The Silver Spoon
The Fellowship of the Ring

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Looping to Get Values

Now, if we want to get the node value of each element, we can use loops. Let’s see the code below. Basically, it iterates through every element in our XML document, getting the node value of each element:

 $xml = simplexml_load_file('bookstore.xml') or die('Failed to create an object'); foreach($xml->children() as $books) < echo $books->name . ", "; echo $books->by . ", "; echo $books->released . ", "; echo $books->pricing . "
"; > ?>

This is the output we get after the code is done running:
The Silver Spoon, Cielia D’Onofrio, 1950, 35.00
The Fellowship of the Ring, J.R.R. Tolkien, 1954, 39.99
Think like a programmer, V. Anton Spraul, 2012, 39.99

Specific Attribute Values

Now, let’s try something more complex. The code example you can see below will acquire the category attribute value from the first element it finds. Then, it will retrieve the lang attribute’s value from the element from the second element:

 $xml = simplexml_load_file('bookstore.xml') or die('Failed to create an object'); echo $xml->book[0]['category'] . "
"; echo $xml->book[1]->name['lang']; ?>

The output we get is the category of the first book and the language of the second:
COOK
en

Looping to Retrieve Attribute Values

The PHP XML example below shows the script that iterates through every element in our books.xml file and gets their attribute values:

 $xml = simplexml_load_file('bookstore.xml') or die('Failed to create an object'); foreach($xml->children() as $books) < echo $books->name['lang']; echo "
"; > ?>

This is the output we get in this case:
en
en
en-us

How to Read XML Files: Summary

• PHP SimpleXML extension allows the coder to PHP read XML documents, access and use them as data structures made of nodes.
• It also allows getting Node and Attribute values. To do that, we use PHP simplexml_load_file function.

Источник