==

(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

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";
}

for ($i = 0, i<10, i++){ echo "counter $i"; }

$ricxvi = 0; while($ricxvi < 10){ echo "another counter $ricxvi" ; $ricxvi ++; }

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";
}

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";
}

<?php $age = 25 function getAge(){ echo $age; } getAge(); /* Output will be error , because we have $age variable out of the function and it isn't global variable.If we want to function has output we need to add a global variable (global $age ) to the function */ ?> <?php //exapmle of global variable $age = 25 function getAge(){ global $age; echo $age; } getAge(); //output will be 25 ?>

<?php // if we want to output variable variables value we use in echo two dollars sign $$ for example $fruit = 'apple'; $apple = "apple is fruit"; echo $$fruit; // output will be "apple is fruit" ?>

<?php $x= 7; $y= $x ++ // $x = 8; $y = 7 $x= 7; $y= ++$x // $x = 8; $y = 8 ?>

//if we use == sign it doesn't check the type of data apart from === sign which check also type of data <?php $a = 34; $b = 34; if($a == $b) { echo "Equal"; } else{ echo "Not Equal"; } //answer will be "Equal" true if('34' == 34){ echo "Equal"; } else{ echo "Not Equal"; } //answer will be "Equal" if('34' == 34){ echo "Equal"; } else{ echo "Not Equal"; } //answer will be "Not Equal" because types of variables isn't equal to each others ?>