LEARN PHP BASICS: Beginner's Guide For Coding by J TAM
Author:J TAM [TAM, J]
Language: eng
Format: azw3
Published: 2020-05-09T16:00:00+00:00
Let's take an example illustrating the spaceship operator in PHP.
<html>
<head>
<title>PHP <=> Operator or Spaceship Operator</title>
</head>
<body>
<?php
print (5 <=> 5);
echo "<br/>";
print (3 <=> 5);
echo "<br/>";
print (5 <=>3);
echo "<hr/>";
print ("C" <=> "C");
echo "<br/>";
print ("A" <=> "C");
echo "<br/>";
print ("C" <=> "A");
echo "<hr/>";
?>
</body>
</html>
PHP ?? or Coalescing Operator
The ?? operator in PHP is introduced in its 7th version, that is, PHP 7.
In PHP ?? or Coalescing operator, if the first operand of this operator is set then it returns its first operand, otherwise second operand will be returned by this operator.
Here is an example that demonstrates PHP Coalescing or ?? operator.
<html>
<head>
<title>PHP ?? Operator or Coalescing Operator</title>
</head>
<body>
<?php
$firstname = "Codes";
$lastname = "Cracker";
$fullname = $_POST['name'] ?? 'name is empty';
echo $fullname;
echo "<hr/>";
$name = $firstname ?? "firstname is not initialized";
echo $name;
echo "<hr/>";
$name = $surname ?? "surname is undefined";
echo $name;
echo "<hr/>";
$name = $fullname ?? "fullname is set previously";
echo $fullname;
?>
</body>
</html>
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