PHP Questions And Answers

41⟩ How can I execute a PHP script using command line?

Just run the PHP CLI (Command Line Interface) program and provide the PHP script file name as the command line argument. For example, "php myScript.php", assuming "php" is the command to invoke the CLI program.

Be aware that if your PHP script was written for the Web CGI interface, it may not execute properly in command line environment.

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42⟩ Would I use print "$a dollars" or "{$a} dollars" to print out the amount of dollars in this example?

In this example it wouldn’t matter, since the variable is all by itself, but if you were to print something like "{$a},000,000 mln dollars", then you definitely need to use the braces.

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43⟩ I am trying to assign a variable the value of 0123, but it keeps coming up with a different number, what is the problem?

PHP Interpreter treats numbers beginning with 0 as octal. Look at the similar PHP interview questions for more numeric problems.

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44⟩ What are the different tables present in MySQL? Which type of table is generated when we are creating a table in the following syntax create table employee(eno int(2),ename varchar(10))?

Total 5 types of tables we can create

1. MyISAM

2. Heap

3. Merge

4. INNO DB

5. ISAM

MyISAM is the default storage engine as of MySQL 3.23. When you fire the above create query MySQL will create a MyISAM table.

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45⟩ How To Create a Table using PHP?

If you want to create a table, you can run the CREATE TABLE statement as shown in the following sample script:

<?php

include "mysql_connection.php";

$sql = "CREATE TABLE ggl_links ("

. " id INTEGER NOT NULL"

. ", url VARCHAR(80) NOT NULL"

. ", notes VARCHAR(1024)"

. ", counts INTEGER"

. ", time TIMESTAMP DEFAULT sysdate()"

. ")";

if (mysql_query($sql, $con)) {

print("Table ggl_links created.n");

} else {

print("Table creation failed.n");

}

mysql_close($con);

?>

Remember that mysql_query() returns TRUE/FALSE on CREATE statements. If you run this script, you will get something like this:

Table ggl_links created.

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46⟩ How can we encrypt the username and password using PHP?

Answer1

You can encrypt a password with the following Mysql>SET PASSWORD=PASSWORD("Password");

Answer2

You can use the MySQL PASSWORD() function to encrypt username and password. For example,

INSERT into user (password, ...) VALUES (PASSWORD($password”)), ...);

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47⟩ How do you pass a variable by value?

Just like in C++, put an ampersand in front of it, like $a = &$b

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48⟩ WHAT IS THE FUNCTIONALITY OF THE FUNCTIONS STRSTR() AND STRISTR()?

string strstr ( string haystack, string needle ) returns part of haystack string from the first occurrence of needle to the end of haystack. This function is case-sensitive.

stristr() is idential to strstr() except that it is case insensitive.

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49⟩ When are you supposed to use endif to end the conditional statement?

When the original if was followed by : and then the code block without braces.

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50⟩ How can we send mail using JavaScript?

No. There is no way to send emails directly using JavaScript.

But you can use JavaScript to execute a client side email program send the email using the "mailto" code. Here is an example:

function myfunction(form)

{

tdata=document.myform.tbox1.value;

location="mailto:mailid@domain.com?subject=...";

return true;

}

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51⟩ How do I find out the number of parameters passed into function9. ?

func_num_args() function returns the number of parameters passed in.

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52⟩ 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.

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53⟩ What is the purpose of the following files having extensions frm, myd, and myi? What these files contain?

In MySQL, the default table type is MyISAM.

Each MyISAM table is stored on disk in three files. The files have names that begin with the table name and have an extension to indicate the file type.

The '.frm' file stores the table definition.

The data file has a '.MYD' (MYData) extension.

The index file has a '.MYI' (MYIndex) extension,

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54⟩ What is the functionality of the function strstr and stristr?

strstr() returns part of a given string from the first occurrence of a given substring to the end of the string. For example: strstr("user@example.com","@") will return "@example.com".

stristr() is idential to strstr() except that it is case insensitive.

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55⟩ 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.

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56⟩ How To Protect Special Characters in Query String?

If you want to include special characters like spaces in the query string, you need to protect them by applying the urlencode() translation function. The script below shows how to use urlencode():

<?php

print("<html>");

print("Please click the links below"

." to submit comments about GlobalGuideLine.com:");

$comment = 'I want to say: "It's a good site! :->"';

$comment = urlencode($comment);

print(""

."<a href="processing_forms.php?name=Guest&comment=$comment">"

."It's an excellent site!</a>");

$comment = 'This visitor said: "It's an average site! :-("';

$comment = urlencode($comment);

print(""

.'<a href="processing_forms.php?'.$comment.'">'

."It's an average site.</a>");

print("</html>");

?>

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57⟩ How do you call a constructor for a parent class?

parent::constructor($value)

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58⟩ WHAT ARE THE DIFFERENT TYPES OF ERRORS IN PHP?

Here are three basic types of runtime errors in PHP:

1. Notices: These are trivial, non-critical errors that PHP encounters while executing a script - for example, accessing a variable that has not yet been defined. By default, such errors are not displayed to the user at all - although you can change this default behavior.

2. Warnings: These are more serious errors - for example, attempting to include() a file which does not exist. By default, these errors are displayed to the user, but they do not result in script termination.

3. Fatal errors: These are critical errors - for example, instantiating an object of a non-existent class, or calling a non-existent function. These errors cause the immediate termination of the script, and PHP's default behavior is to display them to the user when they take place.

Internally, these variations are represented by twelve different error types

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59⟩ What are the differences between GET and POST methods in form submitting, give the case where we can use GET and we can use POST methods?

When we submit a form, which has the GET method it displays pair of name/value used in the form at the address bar of the browser preceded by url. Post method doesn't display these values.

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60⟩ Are objects passed by value or by reference?

Everything is passed by value.

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PHP

Home Computer Programming PHP

139 PHP Questions And Answers

41⟩ How can I execute a PHP script using command line?

42⟩ Would I use print "$a dollars" or "{$a} dollars" to print out the amount of dollars in this example?

43⟩ I am trying to assign a variable the value of 0123, but it keeps coming up with a different number, what is the problem?

44⟩ What are the different tables present in MySQL? Which type of table is generated when we are creating a table in the following syntax create table employee(eno int(2),ename varchar(10))?

45⟩ How To Create a Table using PHP?

46⟩ How can we encrypt the username and password using PHP?

47⟩ How do you pass a variable by value?

48⟩ WHAT IS THE FUNCTIONALITY OF THE FUNCTIONS STRSTR() AND STRISTR()?

49⟩ When are you supposed to use endif to end the conditional statement?

50⟩ How can we send mail using JavaScript?

51⟩ How do I find out the number of parameters passed into function9. ?

52⟩ What is the difference between ereg_replace() and eregi_replace()?

53⟩ What is the purpose of the following files having extensions frm, myd, and myi? What these files contain?

54⟩ What is the functionality of the function strstr and stristr?

55⟩ If the variable $a is equal to 5 and variable $b is equal to character a, what’s the value of $$b?

56⟩ How To Protect Special Characters in Query String?

57⟩ How do you call a constructor for a parent class?

58⟩ WHAT ARE THE DIFFERENT TYPES OF ERRORS IN PHP?

59⟩ What are the differences between GET and POST methods in form submitting, give the case where we can use GET and we can use POST methods?

60⟩ Are objects passed by value or by reference?

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PHP

Home Computer Programming PHP

139 PHP Questions And Answers

41⟩ How can I execute a PHP script using command line?

42⟩ Would I use print "$a dollars" or "{$a} dollars" to print out the amount of dollars in this example?

43⟩ I am trying to assign a variable the value of 0123, but it keeps coming up with a different number, what is the problem?

44⟩ What are the different tables present in MySQL? Which type of table is generated when we are creating a table in the following syntax create table employee(eno int(2),ename varchar(10))?

45⟩ How To Create a Table using PHP?

46⟩ How can we encrypt the username and password using PHP?

47⟩ How do you pass a variable by value?

48⟩ WHAT IS THE FUNCTIONALITY OF THE FUNCTIONS STRSTR() AND STRISTR()?

49⟩ When are you supposed to use endif to end the conditional statement?

50⟩ How can we send mail using JavaScript?

51⟩ How do I find out the number of parameters passed into function9. ?

52⟩ What is the difference between ereg_replace() and eregi_replace()?

53⟩ What is the purpose of the following files having extensions frm, myd, and myi? What these files contain?

54⟩ What is the functionality of the function strstr and stristr?

55⟩ If the variable $a is equal to 5 and variable $b is equal to character a, what’s the value of $$b?

56⟩ How To Protect Special Characters in Query String?

57⟩ How do you call a constructor for a parent class?

58⟩ WHAT ARE THE DIFFERENT TYPES OF ERRORS IN PHP?

59⟩ What are the differences between GET and POST methods in form submitting, give the case where we can use GET and we can use POST methods?

60⟩ Are objects passed by value or by reference?

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