PHP Operators

PHP Operators is a symbol which used to perform operations on operands.
$num=14+16;
Explanation:
Here + is the operator and 14,16 are operands $num is variable

PHP Operators Types:

Assignment Operators
Arithmetic Operators
Array Operators
Bitwise Operators
Comparison Operators
Logical Operators
String Operators
Incrementing/Decrementing Operators
Type Operators
Execution Operators
Error Control Operators

We can also categorize operators on behalf of operands.

Binary Operators: works on two operands such as binary +, -, *, / etc.

Unary Operators: works on single operands such as ++, — etc.

Ternary Operators: works on three operands such as “?:”.

PHP Operators Precedence

Operators	Additional Information	Associativity
[	array()	left
**	arithmetic	right
++ -- ~	increment/decrement and types	right
instanceo	types	non-associative
!	logical (negation)	right
* / %	arithmeti	arithmeti
+ - .	arithmetic and string concatenation	left
<< >>	bitwise (shift)	left
< <= > >=	comparison	non-associative
!ERROR! A11 -> Formula Error: Unexpected operator '='	comparison	non-associative
&	bitwise AND	left
^	bitwise XOR	left
\|	bitwise OR	left
&&	logical AND	left
\|\|	logical OR	left
?:	ternary	left
!ERROR! A18 -> Formula Error: Unexpected operator '='	assignment	right
and	logical	left
xor	logical	left
or	logical	left
,	many uses (comma)	left

Question and Answer-

What will be the output of the following PHP code?

<?php
$a = 10;
$b = 12;
$c= $a + $b;
$c= 22;
?>

<?php

$a = 10;

$b = 12;

$c= $a + $b;

$c= 22;

Output: 22

What will be the output of the following PHP code?

<?php
$x = "test";
$y = "this";
$z = "also"; 
$x .= $y .= $z ;
echo $x;
echo $y;
?>

<?php

$x = "test";

$y = "this";

$z = "also";

$x .= $y .= $z ;

echo $x;

echo $y;

Finally Output: testthisalsothisalso

Explanation: The x .= y is a shorthand for x = x.y and this is evaluated from right to left.

What will be the output of the following PHP code?

<?php
$x = 1;
$y = 2;
if (++$x == $y++)
{
    echo "true ", $y, $x;
}
?>

<?php

$x = 1;

$y = 2;

if (++$x == $y++)

{

echo "true ", $y, $x;

}

Output: true 23

Explanation: x is pre-incremented and y is post-incremented thus both are 2 in the if condition, later y is incremented.

What will be the output of the following PHP code?

<?php
$y = 4;
if ($y-- == ++$y)
{
    echo $y;
}
?>

<?php

$y = 4;

if ($y-- == ++$y)

{

echo $y;

}

Output:

4

Explanation: First $y = 4 is compared to and then decremented, then incremented and compared to $y = 4

PHP Operators

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