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Introduction to PHP

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Comparison Operations

Comparison operations in PHP are used to compare values and determine their relationship to each other. These operations often return boolean values (true or false) based on whether the comparison is true or false.

Equal (==): Checks if two values are equal.

main.php

main.php

copy
<?php
$result = (10 == 5); // `$result` will be `false`
echo $result;
?>

              
1234

            
<?php
$result = (10 == 5);  // `$result` will be `false`
echo $result;
?>

Not Equal (!=): Checks if two values are not equal.

main.php

main.php

copy
<?php
$result = (10 != 5); // `$result` will be `true`
echo $result;
?>

              
1234

            
<?php
$result = (10 != 5);  // `$result` will be `true`
echo $result;
?>

Identical (===): Checks if two values are equal and of the same type.

main.php

main.php

copy
<?php
$result = (10 === "10"); // `$result` will be `false`
echo $result;
?>

              
1234

            
<?php
$result = (10 === "10");  // `$result` will be `false`
echo $result;
?>

Not Identical (!==): Checks if two values are not equal or not of the same type.

main.php

main.php

copy
<?php
$result = (10 !== "10"); // `$result` will be `true`
echo $result;
?>

              
1234

            
<?php
$result = (10 !== "10");  // `$result` will be `true`
echo $result;
?>

The == (Equal) operator compares only the values of two operands, disregarding their data types. If the values of both operands are equal, == returns true. The === (Identical) operator compares both the values and the data types of the operands. It returns true only if both the values and the data types of the operands are identical. The != (Not Equal) and !== (Not Identical) operators work similarly, but they check if the values of the operands are not equal (or not identical).

These distinctions are crucial for accurately comparing values and ensuring the correctness of logical operations in PHP programs.

"Greater Than" and "Less Than" Operators

For example, $result = (10 > 5); will set $result to true:

main.php

main.php

copy
<?php
$result = (10 > 5); // `$result` will be `true`
echo $result;
?>

              
1234

            
<?php
$result = (10 > 5);  // `$result` will be `true`
echo $result;
?>

Boolean values and comparison operations are essential for implementing conditional logic and decision-making in PHP applications. They allow developers to control program flow based on conditions and make dynamic decisions within their code.

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