what does "" means in php code example

Example 1: what does $ sign mean in php

<?php

$name = "World";
echo "Hello, $name";

# $ i.e. "sigil" is used to distinguish a string variable from rest of the string.

Example 2: -> in php

// Create a new instance of MyObject into $obj
$obj = new MyObject();
// Set a property in the $obj object called thisProperty
$obj->thisProperty = 'Fred';
// Call a method of the $obj object named getProperty
$obj->getProperty();