What does colon mean in php?

PHP The colon is a syntax symbol that is usually used to define class properties and methods, namespaces, arrays, switch statements, etc. Specifically, the PHP colon has the following uses.

1. Define class attributes and methods
   In PHP, colons can be used to define class attributes and methods. For example:

class MyClass {
public $name;
public function sayHello() {

echo "Hello, World!";

}
}

2. Define namespace
   In PHP, colons can be used to define namespaces. For example:

namespace MyNamespace;
class MyClass {
// Class definition
}

3. Define array key-value pair
   in PHP , if you need to add key-value pairs to the array, you can use the colon symbol to define it. For example:

$arr ​​= [
"name" => "Zhang San",
"age" => 18
];

4. Used in switch statements
   In PHP's switch statement, colons can be used to define the code block for case matching. For example:

switch ($num) {
case 1:

echo "num is 1";
break;

case 2:

echo "num is 2";
break;

default:

echo "num is other";

}

To sum up, the PHP colon is a very commonly used syntax symbol. It can be used to define class attributes and methods, namespaces, arrays, switch statements, etc. It is very important for PHP developers to be proficient in this syntax notation.

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