PHP variable declaration

$variable = 1;

JS alternative

let variable = 1;

PHP - check if the variable exists

if (isset($variable))

JS alternative

if (typeof variable !== "undefined")

PHP count array elements

$count = count([2, 3, 4]);

JS alternative

let count = [2, 3, 4].length;

PHP count letters in the string

$len = strlen('some string');

JS alternative

let len = 'some string'.length;

PHP absolute value of a given number

$variable = abs(-5);

JS alternative

let variable = Math.abs(-5);

PHP - power of a number

$square = pow(5, 2);

JS alternative

let square = Math.pow(5, 2);

PHP - square root of a number

$square_root = sqrt(16);

JS alternative

let square_root = Math.sqrt(16);

PHP - minimum number

$max = min(2, 3, 4);

JS alternative

let max = Math.min(2, 3, 4);

PHP - maximum number

$max = max([2, 3, 4]);

JS alternative

let max Math.max(...[2, 3, 4])

PHP calculates sum of the array elements

$sum = array_sum([2, 3, 4]);

JS alternative

let sum = 0;
let arr = [1, 2, 3];
for (let value of arr) {
    sum += value;
}

Another way to calculate the same

let arr = [1, 2, 3];
let sum = 0;
let len = arr.length;
for (let i = 0; i < len; sum += arr[i++]);

PHP - string position

$pos = strpos('Hello world', 'world');

JS alternative

let pos = 'Hello world'.indexOf('world');

PHP - edit letter in a string

$string[4] = 'X';

JS alternative

string = string.substring(0, 4) + 'X' + string.substring(5);

PHP convert the variable to integer

$variable = intval(5.5);

JS alternative

let variable = parseInt(5.5);

PHP - explode the sentence

$sentence = "Lorem ipsum dolor st amet";
$words = explode(" ", $sentence);

JS alternative

let sentence = "Lorem ipsum dolor st amet";
let words = sentence.split(" ");

Don't create variables with Georgian alphabet. The following example is just for fun!

$სწავლა_გვინდა = true;
$ვაბარებთ_უნივერსიტეტში = true;
$სწავლა_ძვირია = true;
$მუშაობა_გვინდა = false;

if ($სწავლა_გვინდა) {
	if ($ვაბარებთ_უნივერსიტეტში) {
		if ($სწავლა_ძვირია) {
			echo "\nუნივერსიტეტი ძვირია, ვიწყებთ სწავლას applications.ge-ს კურსზე!";
		} else {
			echo "\nვსწავლობთ უნივერსიტეტში!";
		}
	} else {
		echo "\nვიწყებთ სწავლას applications.ge-ს კურსზე!";
	}
} elseif ($მუშაობა_გვინდა) {
	echo "\nვმუშაობთ";
} else {
	echo "\nდროს ნუ კარგავ!";
}

The

continue

statement breaks only one iteration in the loop and continues with the next iteration

for ($x = 0;  $x < 10;  $x++) {
  if ($x == 7) {
    continue;
  }
  echo "$x"."\n";
}
echo "\n\n";

Prints Only numbers evenly divisible by 2

for ($x = 0;  $x < 10;  $x++) {
  if ($x%2 == 1) {
    continue;
  }
  echo "Example2: $x"."\n";
}

The

break

statement is used to jump out of loops

for ($x = 0;  $x < 10;  $x++) {
  if ($x == 7) {
    break;
  }
  echo "$x"."\n";
}

Another example using

break

statement In this example prints numbers less than 6

for ($x = 0;  $x < 10;  $x++) {
  if ($x*$x > 30) {
    break;
  }
  echo "$x"."\n";
}

Uses

break

statement instead of for loop condition section

for ($i = 0;  ;  $i ++) {
  if ($i == 10) {
    break;
  }
  echo $i . "\n";
}

Logical operators are used to combine conditional statements.

and

($x and $y) True if both $x and $y are true

$x = 40; 
$y = 50;
if ($x > 30 and $y > 45) {
    echo "True";
}

or

($x or $y) True if either $x or $y is true

$x = 40; 
$y = 50;
if ($x > 30 or $y == 85) {
    echo "True";
}

xor

($x xor $y) True if either $x or $y is true, but not both

$x = 40; 
$y = 50;
if ($x > 30 xor $y == 85) {
    echo "True";
}

&&

($x && $y) True if both $x and $y are true

$x = 40; 
$y = 50;
if ($x > 30 and $y > 45) {
    echo "True";
}

||

($x || $y) True if either $x or $y is true

$x = 40; 
$y = 50;
if ($x > 30 or $y == 85) {
    echo "True";
}

!

(!$x) True if $x is not true

$x = 40;
if ($x !== 50) {
    echo "True";
}

==

(Equal) Returns true if $x is equal to $y

$x = 40; 
$y = "40";
var_dump($x == $y); // true

===

(Identical) Returns true if $x is equal to $y, and they are of the same type

$x = 40; 
$y = "40";
var_dump($x === $y); // false

!=

(Not equal) Returns true if $x is not equal to $y

$x = 40; 
$y = "40";
var_dump($x != $y); // false

<>

(Not equal) Returns true if $x is not equal to $y

$x = 40; 
$y = "40";
var_dump($x <> $y); // false

!==

(Not identical) Returns true if $x is not equal to $y, or they are not of the same type

$x = 40; 
$y = "40";
var_dump($x !== $y); // true

>

(Greater than) Returns true if $x is greater than $y

$x = 40; 
$y = 50;
var_dump($x > $y); // false

<

(Less than) Returns true if $x is less than $y

$x = 40; 
$y = 50;
var_dump($x < $y); // true

>=

(Greater than or equal to) Returns true if $x is greater than or equal to $y

$x = 40; 
$y = 50;
var_dump($x >= $y); // false

<=

(Less than or equal to) Returns true if $x is less than or equal to $y

$x = 40; 
$y = 50;
var_dump($x <= $y); // true

Assignment operators are used with:

integer

and

float

values to write / update a variable value. Simple Assignment

$y = 9;
$x = $y;
echo $x . "\n";

Addition

$x = 40; $y = 9;
$x += $y; // same as: $x = $x + $y
echo $x . "\n";

Subtraction

$x = 40; $y = 9;
$x -= $y; // $x = $x - $y
echo $x . "\n";

Multiplication

$x = 40; $y = 9;
$x *= $y; // $x = $x * $y
echo $x . "\n";

Division

$x = 40; $y = 9;
$x /= $y; // $x = $x / $y
echo $x . "\n";

Modulus

$x = 40; $y = 9;
$x %= $y; // $x = $x % $y
echo $x . "\n";

The following code executes the

else

statement because the

float

numbers are different

if (strval(0.000000000035436064) == strval(0.000000000035436064000001)) {
    echo 'if';
} else {
    echo 'else';
}

But if we add one

0

in front of the last digit of the second number, then

if

statement will be executed

if (strval(0.000000000035436064) == strval(0.0000000000354360640000001)) {
    echo 'if';
} else {
    echo 'else';
}

Note:

The above code is one of the best solutions to compare float numbers

First we create an array with the headers

$opts = [
	"http" => [
		"method" => "GET",
		"header" => 
			"Channel-Name: ".CHANNEL."\r\n" .
			"Authorization: ".AUTHORIZATION."\r\n"
	]
];
// Then we create a stream
$context = stream_context_create($opts);

Then we pass the

$content

to

file_get_contents()

function as the

third

parameter

$result = file_get_contents($url, false, $context);

If the URL starts with

https

it will make a request on

443

$ch = curl_init("https://xdatavpn.example.com/Bank");

If it starts with

http

the request will use

80

port

$ch = curl_init("http://xdatavpn.example.com/Bank");