What is the significance of declaration changes in PHP and how does it affect code functionality?

When making declaration changes in PHP, it is important to consider how it may affect the functionality of your code. This includes changing variable types, scope, or visibility. It is crucial to ensure that these changes are made consistently throughout your code to prevent unexpected errors or behavior. 

// Before declaration change
$number = 5;
echo $number;

// After declaration change
$number = "5"; // Changing variable type to string
echo $number;

Keywords

declaration changes PHP code functionality syntax error variable scope

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