Comments in PHP

Comments are those human-readable texts that we should add to make our code more understandable for other programmes. It is ignored by PHP and doesn’t affect your code.

Comment are of Two types.
i. One or Single-line Comment.
ii. Multi-line Comment.

i. One or Single-line Comment:- Single line Comment is used to comment one line at a time or used in one line.

There are two types of Single line Comment:-

1. Starts with //
   Ex- //this is home section.
2. Starts with #
   Ex- # this is footer section.

ii. Multi-line Comment:- It is used to comment more than one line at a time or used in more than one line. It starts with /* and ends with */.

Ex – /* this is
a multi-line
Comment*/

String Interpolation

String Interpolation is a feature or a quick shortcut which allows popping the value of a variable into a double-quoted string.

Ex – {Without String Interpolation}

	<?php
	$num=10;
	echo "value is" . $num;
	?>

view raw Without-String-Interpolation.php hosted with by GitHub

{With String Interpolation}

	<?php
	$num=10;
	echo "value is: $num";
	?>

view raw With-String-Interpolation.php hosted with by GitHub

Constant Variable

It is a type of variable which can’t be modified. To create a constant variable define() function is used.

Syntax :- define(“constant_variable”,value,case-insensitive);

Ex – define(“pi”,3.1415,True); {Note:- If case-insensitive is not assigned then, its by default FALSE}

Rules of Constant Varible :-

1. No need to start the constant varible with the $ sign.
2. Name only starts with a letter and an underscore(_).
3. Variable name can’t start with a number.
4. Constants are automatically global and can be used in the entire script.

Arithmetic/Math Operators

Sample Program

	<?php
	echo 4+2 . "<br />";
	echo 4-2 . "<br />";
	echo 4*2 . "<br />";
	echo 4/2 . "<br />";
	echo 5%2 . "<br />";
	?>

view raw Arithmetic-Operators-example.php hosted with by GitHub

Output

Maths Functions

There are predefined mathematical Functions available in PHP to do the mathematics calculations. See the below list:-

	abs() Returns the absolute (positive) value of a number
	acos() Returns the arc cosine of a number
	acosh() Returns the inverse hyperbolic cosine of a number
	asin() Returns the arc sine of a number
	asinh() Returns the inverse hyperbolic sine of a number
	atan() Returns the arc tangent of a number in radians
	atan2() Returns the arc tangent of two variables x and y
	atanh() Returns the inverse hyperbolic tangent of a number
	base_convert() Converts a number from one number base to another
	bindec() Converts a binary number to a decimal number
	ceil() Rounds a number up to the nearest integer
	cos() Returns the cosine of a number
	cosh() Returns the hyperbolic cosine of a number
	decbin() Converts a decimal number to a binary number
	dechex() Converts a decimal number to a hexadecimal number
	decoct() Converts a decimal number to an octal number
	deg2rad() Converts a degree value to a radian value
	exp() Calculates the exponent of e
	expm1() Returns exp(x) - 1
	floor() Rounds a number down to the nearest integer
	fmod() Returns the remainder of x/y
	getrandmax() Returns the largest possible value returned by rand()
	hexdec() Converts a hexadecimal number to a decimal number
	hypot() Calculates the hypotenuse of a right-angle triangle
	intdiv() Performs integer division
	is_finite() Checks whether a value is finite or not
	is_infinite() Checks whether a value is infinite or not
	is_nan() Checks whether a value is 'not-a-number'
	lcg_value() Returns a pseudo random number in a range between 0 and 1
	log() Returns the natural logarithm of a number
	log10() Returns the base-10 logarithm of a number
	log1p() Returns log(1+number)
	max() Returns the highest value in an array, or the highest value of several specified values
	min() Returns the lowest value in an array, or the lowest value of several specified values
	mt_getrandmax() Returns the largest possible value returned by mt_rand()
	mt_rand() Generates a random integer using Mersenne Twister algorithm
	mt_srand() Seeds the Mersenne Twister random number generator
	octdec() Converts an octal number to a decimal number
	pi() Returns the value of PI
	pow() Returns x raised to the power of y
	rad2deg() Converts a radian value to a degree value
	rand() Generates a random integer
	round() Rounds a floating-point number
	sin() Returns the sine of a number
	sinh() Returns the hyperbolic sine of a number
	sqrt() Returns the square root of a number
	srand() Seeds the random number generator
	tan() Returns the tangent of a number
	tanh() Returns the hyperbolic tangent of a number

view raw List-of-Math-Function(PHP).txt hosted with by GitHub

Assignment Operators

This operator is used to assign value to the variables. For Ex –

$price=39.12 , $ram=$shyam=10 , $name=sushant

In the above example, Assignment operator (=) is used to assign the value (36.58) to the variable ($price).

Combined Assignment Operator

Sample Program

Output

To know more about Assignment Operator Click here – Assignment Operators

Click Here For Next Part –  What are If, Nested if, if else and, Nested if else Statement in PHP?

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Sushant Kumar

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