// Unlike JS, in PHP all variables are local in scope unless declared as global. so both languages are just opposite in declaring variables.

let x = 5;
let y = 3;
function sum() {
    console.log(x + y);
}
sum(); 
//outputs 8 in JavaScript,

$x = 3;
$y = 5;
function sum() {
    echo $x + $y;
}
sum();
//outputs error unless declaring variables

const balls = ball =>{ switch(ball) { case `კალათბურთი`: console.log(`${ball} კალათბურთის ბურთია`); break; case `ფეხბურთი`: console.log(`${ball} ფეხბურთის ბურთია`); break; case `რაგბი`: console.log(`${ball} რაგბის ბურთია `); break; default: console.log(` არ არის არც კალათბურთის არც ფეხბურთის არც რაგბის ბურთი `); } } balls(`ტენისი`);

/* JavaScript is a case senitive language when it comes to variables, function and class declarations, while PHP is not case sensitive in function and class declarations. */

function writeMsg() {
  console.log("hello world")
}
WRITEMSG();
// outputs reference error

function writeMsg() {
  echo "Hello world";
}
WRITEMSG();
// outputs Hello world

$double = 1.345;
printf("%f\n", $double);

to print 2 digits after comma use %.2f or any number

printf("%.2f", $double);

const money = [`dollar`, `euro`, `Sterling`, `Bitcoin`]; for (let i = 0; i < money.length; i++) { console.log(money[i]); } /* output : dollar euro Sterling Bitcoin*/

Echo

echo is a statement, which is used to display the output. echo can be used with or without parentheses. echo does not return any value. We can pass multiple strings separated by comma (,) in echo. echo is faster than print statement.

Print

print is also a statement, used as an alternative to echo at many times to display the output. print can be used with or without parentheses. print always returns an integer value, which is 1. Using print, we cannot pass multiple arguments. print is slower than echo statement.

The $var (single dollar) is a normal variable with the name var that stores any value like string, integer, float, etc. The $$var (double dollar) is a reference variable that stores the value of the $variable inside it.

This function are case-sensitive

echo str_replace("World","Peter","Hello world!");

output: Hello Peter!

This function are case-insensitive

echo str_ireplace("WORLD","Peter","Hello good world!");

output: Hello good Peter!

What is the difference between == and === operator in PHP ? In PHP == is equal operator and returns TRUE if $a is equal to $b after type juggling and === is Identical operator and return TRUE if $a is equal to $b, and they are of the same data type

<?php 
 $a=true ;
 $b=1;
 // Below condition returns true and prints a and b are equal
 if($a==$b){
  echo "a and b are equal";
 }
 else{
  echo "a and b are not equal";
 }
 //Below condition returns false and prints a and b are not equal because $a and $b are of  different data types.
 if($a===$b){
  echo "a and b are equal";
 }
 else{
  echo "a and b are not equal";
 }
?>

``

What is the difference between

==

and

===

operator in PHP ? In

PHP

== is equal operator and returns

TRUE

if $a is equal to $b after type juggling and === is Identical operator and return

TRUE

if $a is equal to $b, and they are of the same data type

$a=true ;
 $b=1;
 // Below condition returns true and prints a and b are equal
 if($a==$b){
  echo "a and b are equal";
 }
 else{
  echo "a and b are not equal";
 }
 //Below condition returns false and prints a and b are not equal because $a and $b are of  different data types.
 if($a===$b){
  echo "a and b are equal";
 }
 else{
  echo "a and b are not equal";
 }