How to determine the data type of a variable in php

In PHP, data types include: Boolean, Integer, Float, String, Array, Object, Resource type, NULL; know A data type that can perform code logic processing more efficiently.

1. Use the var_dump() function to obtain detailed information about any data, including its data type

2. Use the function is_bool() to determine whether the data is [Boolean type]

3. Use the function is_int() to determine whether the data is [Integer] Integer type】

4. Use the function is_float() to determine whether the data is [Float floating point type]

5. Use the function is_string() to determine whether the data is [String string]

6 . Use the function is_array() to determine whether the data is an [Array array]

7. Use the function is_object() to determine whether the data is an [Object object]

8. Use the function is_resource() to determine whether the data is [Resource resource type]

9. Use the function is_null() to determine whether the data is [NULL]

10. Judgment related to numeric types You can also use is_numeric(), ctype_digit()

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