Relational Operators in PHP

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Relational Operators in PHP

Notes:

PHP Relational Operators

Relational operators are also known as comparison operators. They are used find the relationship between two values or compare the relationship between two values; on comparison they yield the result true (1) or false (0).

< : less than
> : greater than

<= : less than or equal to
>= : greater than or equal to

== : equal to
=== : strictly equal to

!= : not equal to
<> : not equal to
!== : strictly not equal to

Example Code:

echo (3 < 4) ? "true" : "false", " "; // true
echo (4 < 3) ? "true" : "false", " "; // false

echo (4 > 3) ? "true" : "false", " "; // true
echo (4 > 5) ? "true" : "false", " "; // false

echo (5 <= 6) ? "true" : "false", " "; // true
echo (6 <= 6) ? "true" : "false", " "; // true
echo (7 <= 6) ? "true" : "false", " "; // false

echo (7 >= 6) ? "true" : "false", " "; // true
echo (7 >= 7) ? "true" : "false", " "; // true
echo (7 >= 8) ? "true" : "false", " "; // false

echo (9 == 9) ? "true" : "false", " "; // true
echo (9 == "9") ? "true" : "false", " "; // true
echo (9 === "9") ? "true" : "false", " "; // false

echo (9 != 9) ? "true" : "false", " "; // false
echo (9 != "9") ? "true" : "false", " "; // false
echo (9 !== "9") ? "true" : "false", " "; // true

echo (9 <> 10) ? "true" : "false", " "; // true

Interview Questions:

1. PHP stands for ______________
a. Hypertext Preprocessor
b. Preprocessor Hypertext
c. Personal Home Processor
d. Personal Hypertext processor
Ans: a

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