Web Technology Experts Notes

Wordpress insert record into table and get last insert Id

In Wordpress, Record insertion into table is quite simple.
1. Create an Object of $wpdb;
2. Set the data in an Array.
3. Set the table name.
4. Use insert function to insert record.
5. In insert function, first argument is table name and Second argument is array.

See Example Below:

global $wpdb;
$tableName = $wpdb->prefix . "users";
$saveFieldArray=array( 
'user_login' => 'mylogin',
'user_pass'=>'pass',
'user_nicename' => 'Poonam', 
'user_email' => 'email@no-spam.com',
'user_registered' => date('Y-m-d H:i:s',time()),
'user_status' => '1',
'display_name' => 'Arun Kumar');

//Insert Into Database
$wpdb->insert( $tableName, $saveFieldArray);

//get the last inert Id
$lastInsertId = $wpdb->insert_id;

Front end Interview Questions and Answers for experienced

Question: How can you declare a class in Javascript?
In javascript, classes declare is quite different from C++, PHP and java.
Following are three different ways to declare the javascript.
1. Class using function as a constructor

function Person(name) {  
    this.name = name;
}

/* Create an Object an object */
var person = new Person("Web Technology experts Notes");  
person.name; // Web Technology experts Notes

2. Class Literal notation

var person = {  
    name: "",
    setName: function(name) {
        this.name = name;
    }
}
person.setName("Web Technology experts Notes");  
person.name; // Web Technology experts Notes

3. Singleton through a function

var person = new function() {  
    this.setName = function(name) {
        this.name = name;
    }
    this.printData = function() {
        return this.name;
    }
}
person.setName("Rafael");  
console.log(person.printData()); // Web Technology experts Notes

Question: What is Difference between null and undefined?
NULL is object
undefined is a datatype

console.log(null);  
console.log(undefined);

Question: How can you add a method to a already defined class?
using prototype you can achieve the same.

function Person(name) {  
    this.name = name;
}
Person.prototype.newfunction = function() {  
    console.debug("new function is called.");
}

//create an object
var person = new Person("Web Technology");
// Calling the new method  
person.newfunction(); // new function is called.

Question: What is Sass?
Sass is the modern way of doing CSS.
Sass works with variables, nested syntax and mathematical operations

Question: How to improve the performance of page from Frontend?

Use sprite images
Javascripts should be at the bottom of the page
Ensure parallel requests
Compress images
Browser Caching

Question: What is XHTML?
XHTML is an HTML that follows the XML rules.

Question: Why Recommended external CSS or Javascript versus inline?
1. Hard to maintain the Inline JS/CSS.
2. Inline js/css load slower.
3. No caching benefits in Inline JS/CSS.

Question: Why do we need to use W3C standard code?
W3C standards are to ensure cross-platform compatibility and more compact file sizes.

Question: What is lazy loading?
Lazy loading is a design pattern commonly used in computer field.
Lazy loading is loading code only once user needs it.

Question: What is the difference between HTML elements and tags?
HTML elements communicate to the browser how to render text.
Aftr that they are surrounded by angular brackets <> they form HTML tags.

Question: What does DOCTYPE mean?
DOCTYPE tells the browser which type of HTML is used in current webpage.

Question: Tell the name of few new tags in HTML5?
datalist, datetime, output, keygen, date, month, week, time, number, range, email, and url.

Question: What is the purpose of the z-index and how is it used?
The z-index helps specify the positioned elements that may overlap one another.
z-index can take following values.
Auto: Sets the order equal to its parents.
Number: Set Orders the Number specified.
Initial: Sets this property to its default value which is zero.
Inherit: Inherits from parent element.

Question: List the main CSS style sheet properties?