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enable db connection to another server
View settings:
getsebool -a | grep httpd
Setting to enable to connect to FB to another server:
setsebool -P httpd_can_network_connect_db 1
by Valeri Tandilashvili
5 years ago
0
MySQL
1
XML DOM - XMLHttpRequest
The example below parses an XML document 
address.xml
into an XML DOM object. Then extracts 
contact
information using 
JavaScript
<!DOCTYPE html>
<html>
   <body>
      <h1>TutorialsPoint DOM example </h1>
      <div>
         <b>Name:</b> <span id = "name"></span><br>
         <b>Company:</b> <span id = "company"></span><br>
         <b>Phone:</b> <span id = "phone"></span>
      </div>
      <script>
         if (window.XMLHttpRequest)
         {// code for IE7+, Firefox, Chrome, Opera, Safari
            xmlhttp = new XMLHttpRequest();
         }
        //  else
        //  {// code for IE6, IE5
        //     xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
        //  }
         xmlhttp.open("GET","address.xml",false);
         xmlhttp.send();
         xmlDoc = xmlhttp.responseXML;

         document.getElementById("name").innerHTML = xmlDoc.getElementsByTagName("name")[0].childNodes[0].nodeValue;
         document.getElementById("company").innerHTML = xmlDoc.getElementsByTagName("company")[0].childNodes[0].nodeValue;
         document.getElementById("phone").innerHTML = xmlDoc.getElementsByTagName("phone")[0].childNodes[0].nodeValue;
      </script>
   </body>
</html>
address.xml
file content
<?xml version = "1.0"?>
<contact>
   <name>Tanmay Patil</name>
   <company>TutorialsPoint</company>
   <phone>(011) 123-4567</phone>
</contact>
by Valeri Tandilashvili
5 years ago
0
XML
XML DOM - XMLHttpRequest
XML Tutorial
1
XML tree structure CODE
XML documents form a tree structure that starts at 
the root
An 
XML tree
starts at a 
root element
and branches from the root to 
child elements
<root>
  <child>
    <subchild>.....</subchild>
  </child>
</root>
The terms 
parent
, 
child
, and 
sibling
are used to describe the relationships between elements. ... 
Parents
have children. 
Children
have parents. 
Siblings
are children on the same level (brothers and sisters). ... We can use any of the online XML tree viewer tools to see the document's tree structure, like this one:
https://www.xmlviewer.org/
Books
XML document to see on tree-viewer
<books>
  <book category="cooking">
    <title lang="en">The goals</title>
    <author>Giada De Laurentiis</author>
    <year>2007</year>
    <price>30.00</price>
  </book>
  <book category="children">
    <title lang="en">12 rules for life</title>
    <author>J K. Rowling</author>
    <year>2002</year>
    <price>29.99</price>
  </book>
  <book category="web">
    <title lang="en">The richest man in Babilon</title>
    <author>Erik T. Ray</author>
    <year>2001</year>
    <price>39.95</price>
  </book>
</books>
by Valeri Tandilashvili
5 years ago
0
XML
XML Tutorial
1
XML schemas CODE
XML Schema Definition (XSD) is used to validate and describe an XML data structure and content . It defines the 
elements
, 
attributes
and 
data types
. Here is how XML schema looks like
<?xml version="1.0" encoding="utf-8"?>
<xs:schema attributeFormDefault="unqualified" elementFormDefault="qualified" xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:element name="company">
    <xs:complexType>
      <xs:sequence>
        <xs:element name="id" type="xs:unsignedInt" />
        <xs:element name="name" type="xs:string" />
        <xs:element name="phone" type="xs:string" />
      </xs:sequence>
    </xs:complexType>
  </xs:element>
</xs:schema>
The XML schema is derived from the following XML:
<company>
    <id>2859385</id>
    <name>Tanmay Patil</name>
    <phone>(011) 123-4567</phone>
</company>
The XML schema is generated using the following online tool:
https://www.liquid-technologies.com/online-xml-to-xsd-converter
by Valeri Tandilashvili
5 years ago
0
XML
XML Schemas
XML Tutorial
0
XML encoding
There are two the most commonly used Encoding Types for XML documents: 1. 
UTF-8
- 8-bits are used to represent a character 2. 
UTF-16
- 16-bits are used to represent a character ... 
UTF
stands for 
UCS Transformation Format
, and UCS itself means 
Universal Character Set
... XML document example that has 
UTF-8
encoding
<?xml version="1.0" encoding="UTF-8"?>
<student>
    <first-name>George</first-name>
    <phone.mobile>(011) 123-4567</phone.mobile>
</student>
Note: If an XML document has not specified encoding, the default is 
UTF-8
by Valeri Tandilashvili
5 years ago
0
XML
XML Encoding
XML Tutorial
0
XML - get PI's values using PHP
The code below can be used to get PI's value from an XML document
<?php

$my_xml_data = 
'<?xml version="1.0" encoding="UTF-8"?>
<student>
    <?sort alpha-ascending?>
    <?textinfo whitespace is allowed ?>
    <first-name>George</first-name>
    <phone.mobile>(011) 123-4567</phone.mobile>
</student>';

$xml = simplexml_load_string($my_xml_data);

$doc   = dom_import_simplexml($xml)->ownerDocument;
$xpath = new DOMXPath($doc);

# prints "/* processing instructions */ ", the value of the first PI: textinfo
echo $xpath->evaluate('string(//processing-instruction("textinfo")[1])');
The output of the above code is the following:
whitespace is allowed
by Valeri Tandilashvili
5 years ago
0
XML
XML Processing Instructions
0
XML Processing Instructions (PIs)
XML Processing instructions allow documents to contain instructions for applications. PI consists of two parts: 1. 
target
- Identifies the application to which the instruction is directed. 2. 
instruction
- A character that describes the information for the 
target
application to process. ... PI's example in real XML document
<?xml version="1.0" encoding="UTF-8"?>
<student>
    <?sort alpha-ascending?>
    <?textinfo whitespace is allowed ?>
    <first-name>George</first-name>
    <phone.mobile>(011) 123-4567</phone.mobile>
</student>
In this example we have two PIs 1. 
sort
with value - 
alpha-ascending
2. 
textinfo
with value - 
whitespace is allowed
... Note: processing instructions can contain any data except the combination 
?>
, which is interpreted as a closing delimiter
by Valeri Tandilashvili
5 years ago
0
XML
XML PIs
0
XML White Spaces
There are 3 types of whitespace within an XML document, XML Syntax, Significant and Insignificant
1. XML Syntactical whitespace - is whitespace required by the XML in order to delimitate XML constructs.

2. Insignificant Whitespace - is whitespace, that is not considered part of an element, if two elements are separated by just whitespace its considered insignificant.

3. Significant Whitespace - is whitespace that XML element attribute contains.
by Valeri Tandilashvili
5 years ago
0
XML
XML White Spaces
0
XML CDATA / comments differences
1. CDATA is still 
part of the document
, while a comment is not 2. In CDATA we cannot include the string 
]]>
, while in a comment 
--
3. CDATA content is visible on the web if we specify 
xmlns
attribute as 
http://www.w3.org/1999/xhtml
, even if the file is saved as 
.xml
<?xml version="1.0" encoding="UTF-8"?>
<html xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <title>CDATA Example</title>
    </head>
    <body>

        <h2>Using a Comment</h2>
        <div id="commentExample">
            <!--
            You won't see this in the document
            and can use reserved characters like
            < > & "
            -->
        </div>

        <h2>Using a CDATA Section</h2>
        <div id="cdataExample">
            <![CDATA[
            You will see this in the document
            and can use reserved characters like
            < > & "
            ]]>
        </div>

    </body>
</html>
by Valeri Tandilashvili
5 years ago
0
XML
XML CDATA
0
XML CDATA Rules
1. 
CDATA
cannot contain the string 
]]>
anywhere in the XML document 2. 
Nesting
is not allowed in CDATA section
by Valeri Tandilashvili
5 years ago
0
XML
XML CDATA
XML Tutorial
0
Results: 1578