Operator	 Name	                      Example	           Result	
  ==	        Equal	                     $x == $y	   Returns true if $x is equal to $y	
  ===	        Identical	             $x === $y	   Returns true if $x is equal to $y, and they are of the same type	
  !=	        Not equal	             $x != $y	   Returns true if $x is not equal to $y	
  <>	        Not equal	             $x <> $y	   Returns true if $x is not equal to $y	
  !==	        Not identical	             $x !== $y	   Returns true if $x is not equal to $y, or they are not of the same type	
  >	        Greater than	             $x > $y	   Returns true if $x is greater than $y	
  <	        Less than	             $x < $y	   Returns true if $x is less than $y	
  >=	        Greater than or equal to     $x >= $y	   Returns true if $x is greater than or equal to $y	
  <=	        Less than or equal to	     $x <= $y	   Returns true if $x is less than or equal to $y

// Equal
$x = 50;  
$y = "50";

var_dump($x == $y); // returns TRUE because values are equal
echo "\n";

// Identical
$x = 50;  // integer type
$y = "50"; // string type

var_dump($x === $y); // returns false because types are not equal
echo "\n";

// Not equal
$x = 50;  
$y = "50";

var_dump($x != $y); // returns false because values are equal
echo "\n";

// Not equal. Both operators (!= / <>) give the same output. The only difference is that '<>' is in line with the ISO standard while '!= ' does not follow ISO standard.
$x = 50;  
$y = "50";

var_dump($x <> $y); // returns false because values are equal
echo "\n";

// Not identical
$x = 50;  
$y = "50";

var_dump($x !== $y); // returns true because types are not equal
echo "\n";

// Greater than
$x = 100;
$y = 50;

var_dump($x > $y); // returns true because $x is greater than $y
echo "\n";

// Less than
$x = 10;
$y = 50;

var_dump($x < $y); // returns true because $x is less than $y
echo "\n";

// Greater than or equal to
$x = 10;
$y = 10;

var_dump($x >= $y); // returns true because $x is greater than or equal to $y
echo "\n";

// Less than or equal to
$x = 10;
$y = 10;

var_dump($x <= $y); // returns true because $x is less than or equal to $y
echo "\n";