PHP Syntax

Basic PHP Syntax A PHP code starts with <?php and ends with ?>: <?php // PHP code write here ?> PHP files extension is ".php". A PHP file contains HTML tags, and some PHP code.  continue reading.

PHP Comments

Comments in PHP Comment code in PHP is a line that is not executed in the program. Its only purpose is to be read by someone who is looking at the code. Comments can be used to: Let others understand your code Remind yourself of what you did – Most programmers have experienced coming back to their own work a year or two later and having to re-figure out what they did. Comments can remind you of what you were thinking when you wrote the code PHP supports several ways of commenting: Live Demo <?php // This is a single-line comment # This is also a single-line comment /*This is a multiple-lines comment block*/ ?>continue reading.

PHP Variables

PHP Variables Variables are use to store the value Creating PHP Variables In PHP, a variable starts with the $ sign, followed by the name of the variable: Example Live Demo <?php $txt = "Hello world!"; $x = 5; $y = 10.5; ?> After the execution of the statements above, the variable $txt will hold the value Hello world!, the variable $x will hold the value 5, and the variable $y will hold the value 10.5. Note: When you assign a text value to a variable, put quotes around the value. Note: Unlike other programming languages, PHP has no command for declaring a variable. It is created the moment you first assign a value to it.continue reading.

PHP $ and $$ Variables

The $a is a variable with the $a  name that stores the value like string, int, float, etc. The $$aa is a reference variable that stores the value of the $variable inside it. Examples. <?php $a = “xyz”; $$b = 50; echo $a.” “; echo $$b.” “; echo $xyz; ?> In the above example, we have assigned a value to the variable a as xyz. The value of the reference variable $$b is assigned as 50. Now we have printed the values $a, $$b and $xyz.  

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PHP echo and print

In PHP have two way to get the output:- echo print Echo: In ‘echo’ statement is a language construct and never behaves like a function, hence no parenthesis required. The end of the echo statement the semi-colon (‘;’) is needed. We can use ‘echo’ to output strings or variables. Below are some of the usage of echo statement in PHP: Display Text The following example shows how to output text with the echo command (notice that the text can contain HTML markup): Example Live Demo <?php echo "<h2>PHP is Fun!</h2>"; echo "Hello world!<br>"; echo "I'm about to learn PHP!<br>"; echo "This ", "string ", "was ", "made ", "with multiple parameters."; ?> Display Variables The following example shows how to output text and variables with the echo statement: Example Live Demo <?php $var1 = "Learn PHP"; $var2 = "W3Schools.com"; $x = 5; $y = 4; echo "<h2>" . $var1 . "</h2>"; echo "Study PHP at " . $var2 . "<br>"; echo $x + $y; ?> The PHP print Statement The print statement can be used with or without parentheses: print or print(). Display Text The following example shows how to output text with the print command (notice that the textcontinue reading.

PHP – Constants Types

PHP constants are name or identifier that can't be changed at the time of the execution of the script. we used PHP constants in 2 ways: Using define() function Using const keyword PHP constants follow the same PHP variable rules. For example, it can be started with a letter or underscore only. Conventionally, PHP constants should be defined in uppercase letters. PHP constant: define() Let's see the syntax of define() function in PHP. define(name, value, case-insensitive)  name: specifies the constant name value: specifies the constant value case-insensitive: Default value is false. <?php define("MESSAGE","Hello JavaTpoint PHP"); echo MESSAGE; ?> Output: Hello JavaTpoint PHP Const Keyword The const keyword defines constants at compile time. It is a language construct not a function. It is a bit faster than define(). It is always case sensitive. <?php const MESSAGE="Hello const by JavaTpoint PHP"; echo MESSAGE; ?> Output: Hello const by JavaTpoint PHPcontinue reading.

PHP Data Types

PHP data types are used to hold different types of data or values. PHP supports 8 primitive data types that can be categorized further in 3 types: Scalar Types Compound Types Special Types PHP Data Types: Scalar Types There are 4 scalar data types in PHP. boolean integer float string PHP Data Types: Compound Types There are 2 compound data types in PHP. array object PHP Data Types: Special Types There are 2 special data types in PHP. resource NULL

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PHP Operators

PHP language has following types of operators. Arithmetic Operators Comparison Operators Logical/Relational Operators Assignment Operators Conditional/ternary Operators Arithmetic Operators Operator Description Example + Adds two operands A + B will give 30 – Subtracts second operand from the first A – B will give -10 * Multiply both operands A * B will give 200 / Divide numerator by de-numerator B / A will give 2 % Modulus Operator and the remainder of after an integer division B % A will give 0 ++ Increment operator, increases integer value by one A++ will give 11 — Decrement operator, decreases integer value by one A– will give 9 Comparison Operators Operator Description Example == Checks if the value of two operands are equal or not, if yes then condition becomes true. (A == B) is not true. != Checks if the value of two operands are equal or not, if values are not equal then the condition becomes true. (A != B) is true. > Checks if the value of the left operand is greater than the value of right operand, if yes then condition becomes true. (A > B) is not true. < Checks if the value of the left

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