Operator’s screenshots source: https://www.php.net/manual/en/language.operators.php

Let’s see operator operations…

  • Unary Operator

We found increment and decrement cases.

Increment case: a++ or ++a // a++ means a=a+1

Decrement case: a– or –a// a– means a=a-1

File – incr.php

<?php
$a=10;
echo “<br> a is $a”;
// a++ means a=a+1
$a++;
echo “<br> a is $a”;
++$a;
echo “<br> a is $a”;
?>
output

File – decr.php

<?php
$a=10;
echo “<br> a is $a”;
// a– means a=a-1
$a–;
echo “<br> a is $a”;
–$a;
echo “<br> a is $a”;
?>
output
  • Arithmetic Operators: operators including (+ – * / % **) have several roles in PHP for doing arithmetic operations.

Let’s see some, Arithmetic operations in PHP

let’s perform addition operation in PHP.

File – code1.php

<?php
// addition operator ‘+’
$b=10;
$c=20;
$add=$b+$c;
echo ‘addition is: ‘.$add;
?>
 
<?php
$k=20;
$k++;
echo ‘<br>’;
echo ‘k is: ‘.$k;
?>
output

let’s perform subtraction operation in PHP.

File – code2.php

<?php
// subtraction operator ‘-‘
$b=10;
$c=20;
$sub=$c-$b;
echo ‘subtraction is: ‘.$sub;
?>
 
<?php
$k=20;
$k–;
echo ‘<br>’;
echo ‘k is: ‘.$k;
?>
output

let’s perform multiplication operation in PHP.

File – code3.php

<?php
// multiplication operator ‘*’
$b=10;
$c=20;
$mul=$c*$b;
echo ‘multiply is: ‘.$mul;
?>
output
let’s perform division operation in PHP.

file – code4.php

<?php
// division operator ‘/’
$b=10;
$c=20;
$div=$c/$b;
echo ‘division is: ‘.$div;
?>
<?php
echo ‘<br> 200/10 is:’;
echo 200/10;
?>
output

let’s perform modulus operation in PHP.

File – code5.php

<?php
// modulus operator ‘%’
$b=10;
$c=20;
$mod=$c%$b;
echo ‘modulus is: ‘.$mod;
?>
<?php
echo ‘<br> 10%7 is: ‘;
echo 10%7;
?>
output

file – code6.php

<?php
/* write a code, to find the quotient and remainder
of two values
*/
$a=10;
$b=7;
$quo=$a/$b;
$rem=$a%$b;
echo ‘quotient of 10 & 7 is: ‘.$quo;
echo ‘<br> remainder of 10 & 7 is: ‘.$rem;
 
$a=20;
$b=2;
$quo=$a/$b;
$rem=$a%$b;
echo ‘<br><br> quotient of 10 & 7 is: ‘.$quo;
echo ‘<br>remainder of 10 & 7 is: ‘.$rem;
?>
output

File – code7.php

<?php
/* Exponentiation operator ‘**’
3 ** 2 = 3^2 = 3×3 = 9
4 ** 2 = 4^2 = 4×4 =16
*/
echo ‘3**2 is: ‘;
echo 3**2;
echo “<br>”;
echo ‘4**2 is: ‘;
echo 4**2;
?>
output
  • Logical operators: logical operators including [AND (&& and) OR (|| or) NOT (!)]

It checks both condition is true or not… if true then it returns ‘1’, if false then return ‘0’

Let’s see some coding examples using logical operators …

let’s perform Logical AND operation in PHP.

File – code8.php

<?php
/* logical AND
true && true
true and true
*/
$a=10;
$b=20;
if ($a==10 && $b==20) {
    echo ‘variable values $a,$b matched!’;
}
 
$str1=’microcodes’;
$str2=’microcodes.in’;
if ($str1==’microcodes’ and $str2==’microcodes’) {
    echo ‘<br> both strings matched!’;
}
else{
    echo ‘<br> strings not matched!’;
}
?>
output

let’s perform Logical OR operation in PHP.

file – code9.php

<?php
/* logical OR
true || or_true
true or or_true
*/
$a=10;
$b=20;
if ($a==30 || $b==20) {
    echo ‘one variable matched!’;
}
 
$str1=’microcodes’;
$str2=’microcodes.in’;
if ($str1==’shimanta’ or $str2==’microcodes.in’) {
    echo ‘<br> one string matched!’;
}
else{
    echo ‘<br>both strings not matched!’;
}
?>
output

let’s perform Logical NOT operation in PHP.

file – code10.php

<?php
// NOT operator ‘!’
$a=10;
echo $a!=9;
$str=’krishna’;
if($str!=’krish’){
    echo ‘<br> str not krishna ‘;
}
?>
output

file – code11.php

<?php
/* xor gate means
xor means one either true but both not
*/
$a=2;
$b=3;
if($a==3 xor $b==3){
    echo ‘variable a & b may matched! ‘;
}
 
$str1=’TATA’;
$str2=’TATA’;
if($str1==’TATA’ xor $str2==’TATA’){
    echo ‘<br>TATA IS TATA’;
}
else{
    echo ‘<br> else part runs!!’;
}
?>
output

  • Relational operators: including operators [>= <= != ><]

Let’s see some coding examples using relational operators…

let’s perform relational(less than < ) operation in PHP.

File – code12.php

<?php
// less than operand_1 < operand_2
$a=10;
$b=11;
if($a<$b){
    echo ‘a is smaller than b’;
}
?>
output

let’s perform relational(greater than > ) operation in PHP.

file – code13.php

<?php
// greater than operand_1 > operand_2
$a=20;
$b=11;
if($a>$b){
    echo ‘a is greater than b’;
}
?>
output

let’s perform relational(less than equal <= ) operation in PHP.

file – code14.php

<?php
// less than or equal , operand_1 <= operand_2
$a=20;
 
if($a<=21){
    echo ‘a is <= 20’;
}
$b=$a;
if($b<=20){
    echo ‘<br> b is <= 20’;
}
?>
output

let’s perform relational(greater than > ) operation in PHP.

file – code15.php

<?php
// greater than or equal , operand_1 >= operand_2
$a=20;
 
if($a>=19){
    echo ‘a is >= 19’;
}
$b=$a;
if($b>=20){
    echo ‘<br> b is >= 20’;
}
?>
output

  • Conditional (ternary) Operator:

Syntax – expression_1? expression_2:expression_3

Here if ‘expression_1’ matches then ‘expression_2’ will executes, otherwise ‘expression_3’ executes.

File – code16.php

<?php
$v1=20;
echo ‘variable v1 is: ‘.$v1;
$v1 = ($v1==20)?300:200;
echo ‘<br> variable v1 now: ‘.$v1;
?>
output

file – code17.php

<?php
$str=’Jamshed Ji TATA’;
echo ‘str is: ‘.$str;
 
// see variable $str can’t matched
$str = ($str==’Jamshed TATA’)?’JRD TATA’:’Ratan TATA’;
echo ‘<br> str now: ‘.$str;
?>
output

download notes

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