Definition: The modifier indentation in PHP allows for more space between PHP statements, helping to improve readability and maintainability. It's crucial for debugging and maintaining code. The term "indentation" refers to how far spaces are inserted into a line that indicate nesting levels of functions or variables. For example, if you have `function foo() { echo "Hello"; }` inside an array containing nested functions `bar()`, the indentation would look like this: `[bar()]`.
closed bracket.
what should be said.