Unlike many of its counterparts, PHP is not a strictly typed language. Essentially, this means that a developer doesn't need to explicitly set the type (number, string, Boolean) of a variable before using it. Instead, the PHP interpreter automatically detects variable type based on the information stored within a variable.

While this makes programming in PHP very easy, it does have an important drawback: when you do actually need to test a variable's type, a loosely typed language can be somewhat confusing to deal with. Luckily, the developers of PHP knew this and therefore included a toolkit of functions designed specifically to test variables and find out if they belong to a particular character class - that is, whether they contains strings, integers, objects or Booleans.

This list outlines the more useful functions available in this category and provides explanations and usage examples.

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