#13 View Parser class in CodeIgniter 4

- The Parser class processes “PHP/HTML scripts” stored in the application’s view path. These scripts can not contain any PHP.
- The View Parser can perform simple text substitution for pseudo-variables contained within your view files.
- Pseudo-variables are not extracted into PHP variables; instead their value is accessed through the pseudo-variable syntax, where its name is referenced inside braces.
{ some_varibale }

Generally we have 3 types of substitutions
1.Simple substitution
The simple substitution performed by the parser is a one-to-one replacement of pseudo-variables.

2.Loop Substitutions
A loop substitution happens when the value for a pseudo-variable is a sequential array of arrays. Nothing but group of records.

3.Nested Substitutions
A nested substitution happens when the value for a pseudo-variable is an associative array of values, like a record from a database:

1. setData():
View parameters are passed to setData() as an associative array of data to be replaced in the template.
2. render(" name_of_the_view ", [ options ]):
Builds the output based upon a file name and any data that has already been set
Options supported:
cache: - the time in seconds, to save a view’s results
cache_name: - the ID used to save/retrieve a cached view result; defaults to the viewpath
cascadeData: - true if the data pairs in effect when a nested or loop substitution occurs should be propagated
saveData: - true if the view data parameter should be retained for subsequent calls
leftDelimiter: - the left delimiter to use in pseudo-variable syntax
rightDelimiter: - the right delimiter to use in pseudo-variable syntax