All Tutorials

• Php Web Development Tutorial Series And Introduction .
• Php Tools And Xampp Installation And Customization .
• How To Write Php Source Code And Run / Execute It In Web Browser ?
• How To Add Comments In Php Code ?
• How To Open And Close Php Tags And Their Types ?
• Everything About Php Variables , Their Decalaration And Assignments .
• What Are Php Programming Data Types ?
• Data Type Conversion Using Type Casting In Php .
• Data Type Conversion Using Functions In Php .
• How To Print Special Characters In Php ?

What Are Operators ?

Types Of Operators :

• The Assignment Operator .
• Arithmetic Operators .
• Concatenation Operator .
• Combined Assignment Operators .
• Comparison Operators .
• Logical Operators.
• Increment And Decrement Operators .

The Assignment Operator ( = ) :

$name = "Asim";

Arithmetic Operators :

• Operator Symbol : +
  Name :Plus Operator
  Example : 10 + 3
  Result : 13

• Operator Symbol :  -
  Name : Minus Operator
  Example : 10 - 7
  Result : 3

• Operator Symbol :  /
  Name : Plus Operator
  Example : 10 / 2
  Result : 5

• Operator Symbol : *
  Name : Multiplication Operator
  Example : 10 * 2
  Result : 20

• Operator Symbol : %
  Name : Modulus (Remainder) Operator
  Example : 10 % 3
  Result : 1

Concatenation Operator (.) :

$centimeters = 300;
print "The width is ".($centimeters/100). "meters";

Combined Assignment Operators :

<?php
$y = 10;
$y = $y + 5;  // $y now equals 15
print $y;
?>

We can also write above program as

<?php
$y = 10;
$y += 5; /* Assignment operator used with Arithmetic Operator . $y now equals 15*/
print $y;
?>

Types Of Combined Assignment Operators :

• Operator Symbol : +=

$y += 5

$y = $y + 5

• Operator Symbol : -=

$y -= 5

$y = $y - 5

• Operator Symbol : *=

$y *= 5

$y = $y * 5

• Operator Symbol : /=

$y /= 5

$y = $y / 5

• Operator Symbol : %=

$y %= 5

$y = $y % 5

• Operator Symbol : .=

$y .= "Test"

$y = $y . "Test"

Comparison Operators :

$x < 5;

Types Of Comparison Operators :

• Operator Symbol : ==
  Operator Name : Equivalence Or Equals
  Operator Function : Checks the equality of operands
  Example :200 == 200
  Result : True
  Because 200 is equal to 200. If operands are not equal then the output will be false.

• Operator Symbol : !=
  Operator Name : Non-Equivalence or Not Equals To
  Operator Function : Checks the inequality of operands
  Example :200 != 100
  Result : True
  Because 200 is not equal to 100. If operands are equal then the output will be false.

• Operator Symbol : >
  Operator Name : Greater than
  Operator Function : Checks whether the left operand is greater than the right operand or not
  Example :200 > 300
  Result : False
  Because 200 is not greater than 300. If left operand is greaer than right operand (for example 200 > 100)then the output will be true.

• Operator Symbol : <
  Operator Name : Less than
  Operator Function : Checks whether the left operand is less than the right operand or not
  Example :200 < 300
  Result : true
  Because 200 is less than 300. If left operand is less than right operand (for example 200 < 100) then the output will be false.

• Operator Symbol : >=
  Operator Name : Greater than or Equals to
  Operator Function : Checks whether the left operand is greater than or equal to the right operand or not
  Example :5 >= 15
  Result : False
  Because 5 is not greater than 15 and also 5 is not equal to 15. If left operand is greater than right operand or equal to the right operand (for example 200 >= 100) or (for example 200 >= 200) then the output will be true.

• Operator Symbol : <=
  Operator Name : Less than or Equals to
  Operaor Function : Checks whether the left operand is less than or equal to the right operand or not
  Example :5 <= 15
  Result : true
  Because 5 is less than 15 . If left operand is greaer than right operand or equal to the right operand (for example 200 >= 100) or (for example 200 >= 200) then the output will be true.

• Operator Symbol : ==
  Operaor Function : Checks whether the left operand VALUE AND DATAYPE is same as the right operand or not
  Example :5 == "5"
  Result : falseBecause 5 is an integer while "5" is string.

Logical Operators (and, or, not) :

OR logical Operator :

And Logical Operator

And Logical Operator

AND Logical Operator ( && ) :

OR Logical Operator

OR Logical Operator

Not Logical Operator (!) :

Increment ( ++ ) And Decrement ( -- ) Operators :

$a = 5 ;
$a++ ; /* Value of $a is incremented By 1 */
$a-- ; /* Value of $a is decremented By 1 */

$a = 5 ;
++$a ; /* $a is incremented */
--$a ; /* $a is decremented */

Difference Between Postfix And Prefix :

<?php
/*using post increment */
$test_var = 5;
print " Post Increment ";
print "The value of the test_var is :".$test_var."<br>;
print " By Using Post Increment the value of test_var is :".$test_var++;
print "<br>; /* for next line */
print " On next line, the value is now : ".$test_var;
print "<br>; /* for next line */
/*using Post Decrement */
$test_var = 5;
print " Post Decrement ";
print "The value of the test_var is :".$test_var."<br>;
print "By Using Post Decrement the value of test_var is :".$test_var--;
print "<br>; /* for next line */
print " On next line, the value is now : ".$test_var;
print "<br>; /* for next line */
/*using Pre Increment */
$test_var = 5;
print " Pre Increment ";
print "The value of the test_var is :".$test_var."<br>;
print " By Using Pre Increment the value of test_var is :".++$test_var;
print "<br>; /* for next line */
print " On next line, the value is now : ".$test_var;
print "<br>; /* for next line */
/*using Pre Decrement */
$test_var = 5;
print " Pre Decrement ";
print "The value of the test_var is :".$test_var."<br>;
print " By Using Pre Decrement the value of test_var is :".--$test_var;
print "<br>; /* for next line */
print " On next line, the value is now : ".$test_var;
print "<br>; /* for next line */
?>

Data Type Conversion Using Functions In PHP :

• double (value);

• strval (value) ;

Print Special Characters In Php :

<?php

echo "He said : \ " I love Pakistan \" ";

?>

He said : "I love Pakistan "

<?php

$city = "Karachi";

echo 'City is : $city '. '<br/>;

echo " City is : $city ";

?>

City is : $city

City is : Karachi

Change Data Type  And Print Special Characters In Php