Tag Archives: array

Php Interview Questions and Answers – Part 9


1- How can we know that a session is started or not? A session starts by session_start() function. This session_start() is always declared in header portion. it always declares first. then we write session_register(). 2- What are the differences between  mysql_fetch_array(),  mysql_fetch_object(),  mysql_fetch_row()? Answer 1: mysql_fetch_array() -> Fetch a result row as a combination of associative array and regular array. mysql_fetch_object() -> Fetch a result row as an object. mysql_fetch_row() -> Fetch a result set as a regular array(). Answer […]

Select Records using PHP MySQL Select Statement

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You can use SELECT statement to select data from a database. Syntax SELECT column_name(s) FROM table_name To get PHP to execute the statement above we must use the mysql_query() function. This function is used to send a query or command to a MySQL connection. For Example: The following example selects all the data stored in the “student” table (The * character selects all the data in the table): <?php $con = mysql_connect(“localhost”,”username”,”password”); if (!$con) { die(‘Could not connect: ‘ . […]

Swapping Array Keys and Values

Swapping Array

In this article we discuss about Swapping Array Keys and Values. If you want interchange the keys and values of an associative array. It’s very easy, just use PHP’s array_flip() function which perform a very specialized task. It reverses the key-value relationship for all the elements of an associative array and returning a new array that is the mirror image of the original. <?php $opposite_key_value = array(“white” => “black”, “day” => “night”, “open” => “close”); print_r(array_flip($opposite_key_value)); ?>

Php Interview Questions and Answers – Part 7


This is the 7th part of Php Interview Questions and Answers. 1- How can we destroy the session, how can we unset the variable of a session? session_unregister() – Unregister a global variable from the current session session_unset() – Free all session variables 2- What are the different functions in sorting an array? Sorting functions in PHP: asort() arsort() ksort() krsort() uksort() sort() natsort() rsort() 3- How can we know the count/number of elements of an array? 2 ways: a) sizeof($array) […]

Convert .xsd file into array in PHP


As we know that PHP has no direct function to convert .xsd(XML Schema Definition) file into associative array like XML file. So you have to  first convert .xsd file into xml then finally parse xml file into associative array. Below are few easy steps to convert .xsd file into associative array.   $doc->preserveWhiteSpace = true; $doc->load(‘yourfile.xsd’); Step 2: Save .xsd file as an xml file. $doc->save(‘myxml.xml’); Step 3: Generate xml as a string and removed xsd prefixes. $myxmlfile = file_get_contents(‘myxml.xml’); […]

PHP Interview Questions and Answers – Part 4


1- What is the difference between ereg_replace() and eregi_replace()? eregi_replace() function is identical to ereg_replace() except that it ignores case distinction when matching alphabetic characters. 2- How do I find out the number of parameters passed into function9. ? func_num_args() function returns the number of parameters passed in. 3- If the variable $a is equal to 5 and variable $b is equal to character a, what’s the value of $$b? 100, it’s a reference to existing variable. 4- How To […]

Php Interview Questions and Answers – Part 3


1- What is the difference between CHAR and VARCHAR data types? CHAR is a fixed length data type. CHAR(n) will take n characters of storage even if you enter less than n characters to that column. For example, “Hello!” will be stored as “Hello! ” in CHAR(10) column. VARCHAR is a variable length data type. VARCHAR(n) will take only the required storage for the actual number of characters entered to that column. For example, “Hello!” will be stored as “Hello!” […]

Php Interview Questions and Answers – Part 2


1- Why doesn’t the following code print the newline properly? <?php $str = ‘Hello, there.nHow are you?nThanks for visiting techpreparation’; print $str; ?> Because inside the single quotes the n character is not interpreted as newline, just as a sequence of two characters – and n. 2- Would you initialize your strings with single quotes or double quotes? Since the data inside the single-quoted string is not parsed for variable substitution, it’s always a better idea speed-wise to initialize a […]

Parse JSON, XML and HTML – jQuery


In this post, find out jQuery code on how to parse JSON, parse XML and parse HTML. If you are still using custom code for parsing any of these and making your life more miserable then stop doing it. Why? If you are not aware then here is a news for you that jQuery has inbuilt utility methods for each. Which are, parseJSON() parseXML() parseHTML() Using parseJSON() This method takes a well-formed JSON string and returns the resulting JavaScript object. […]

Php Interview Questions and Answers – Part 1


1- What’s PHP ? The PHP Hypertext Preprocessor is a programming language that allows web developers to create dynamic content that interacts with databases. PHP is basically used for developing web based software applications. 2- What Is a Session? A session is a logical object created by the PHP engine to allow you to preserve data across subsequent HTTP requests. There is only one session object available to your PHP scripts at any time. Data saved to the session by […]