<?php

$colors = ["Red", 7735, "Blue"];
$colors[] = "Yellow";  //add new member in last position


echo $colors[0]; 

echo "\n\n\n";

print_r($colors);

echo "\n\n\n";

var_dump($colors);

OUTPUT:

Red


Array
(
    [0] => Red
    [1] => 7735
    [2] => Blue
    [3] => Yellow
)



array(4) {
  [0]=>
  string(3) "Red"
  [1]=>
  int(7735)
  [2]=>
  string(4) "Blue"
  [3]=>
  string(6) "Yellow"
}

function pyramid($n) {
 // number of spaces
 $k = $n;
 // outer loop to handle number of rows
 // n in this case
 for ($i = 0; $i < $n; $i++) {
	  // inner loop to handle number spaces values changing acc.
	  // to requirement
	  for ($j = 0; $j < $k; $j++) {
	   echo " ";
	  }
	 
	  // decrementing k after each loop
	  $k = $k - 1;
	 
	  // inner loop to handle number of columns
	  // values changing acc. to outer loop
	  for ($j = 0; $j <= $i; $j++ )
	  {
	   // printing stars
	   echo "* ";
	  }
	 
	  // ending line after each row
	  echo "\n";
	 }
}
 // Driver Code
 $n = 10;
 pyramid($n);

          1 
         1 1 
        1 1 1 
       1 1 1 1 
      1 1 1 1 1 
     1 1 1 1 1 1 
    1 1 1 1 1 1 1 
   1 1 1 1 1 1 1 1 
  1 1 1 1 1 1 1 1 1 
 1 1 1 1 1 1 1 1 1 1

gettype(variable);

$int = 10;
echo gettype($int)."\n"; // outputs:  integer

$str = "PHP";
echo gettype($str)."\n"; // outputs:  string

$flt = 1.2;
echo gettype($flt)."\n"; // outputs:  double  (also called float)

$bool = true;
echo gettype($bool)."\n"; // outputs:  boolean

$arr = [1,2,3,4,5,6,7,8,9,10];
echo gettype($arr)."\n"; // outputs:  array

// in PHP 
$array = [0, 1, 2];
$array2 = $array;
$array2[1] = 6;
array_push($array2, 3);
print_r ($array);
print_r($array2);
// $array = [0, 1, 2],    $array2 = [0, 6, 2, 3]

// In JS
let array = [0, 1, 2];
let array2 = array;
array2[1] = 6;
array2.push(3);
console.log(array);
console.log(array2);
// array = array2 = [0, 6, 2, 3]

let a = [0, 1, 2];
let b = a.slice();
b.push(3);
b[1] = 6;
console.log(a, b);
// and the result of 1st and 2nd arrays will not be same. like it wasn't in PHP

// P.s at that case will not change anything, because it's not reference already,
// we just took array's element, the primitive type (integer), not object or array.
let array = [0, 1, 2];
let value = array[1];
value = 10;
console.log(array);  // [0, 1, 2], will not change
console.log(value);    // 10

// but if there will be object, or array as an element in array and if we will modify on it, 
// than the main array will change the value as well.
const array = [{name: 'lela'}, {name: 'gela'}, {name: 'bela'}];
const object = array[0];
object.name = 'test';
console.log(array);
console.log(object);

<?php
$arr=[];
for ($i=0; $i<10; $i++){
    $arr[$i]= rand(0,100);  
}
print_r($arr);

function str_info($string,$pos){
    $arr= ["length is: ". strlen($string),
           "UPPER:". strtoupper($string),
           "string possitin: " .strpos($string, $pos),
           "reverse is: ".strrev($string)];
    return implode("\n", $arr) ; // აქ შეაერთებს მასივის ელემენტებს და დააბრუნებს ტექსტის სახით

<?php

$x = 10;

// Sum of numbers from 1 to n
$sum = 0;
for ($i = 1;  $i <= $x;  $i++) {
	$sum += $i;
}
echo "SUM of numbers from 1 to $x: $sum\n";


// easy way to calculate SUM of numbers to n
$sum = $from1To * ($x+1) / 2;
echo "SUM of numbers from 1 to $x: $sum\n";