PHP8 function: get_debug_type(), to accurately determine the variable type

With the release of PHP8, many developers have become very interested in the new get_debug_type() function. The function of this function is to accurately determine the type of variables, including scalar (scalar), array (array), resource (resource), object (object), etc. In daily development, we often encounter situations where variable types are unclear, and using the get_debug_type() function can greatly improve the accuracy and readability of the code.

First, let’s take a look at the basic classification of PHP variable types.

1. Scalar: represents a single value, including four types: Integer, Float, Boolean and String.

2. Array: Unlike other programming languages, PHP's array not only supports numeric indexes, but also supports associative indexes.

3. Resource: Represents some external programs or resources, such as open files, databases, etc.

4. Object (Object): It is a data structure defined using a class.

In PHP8, we can use the get_debug_type() function to accurately view the type of variables. For example:

<?php
    $var1=10;
    $var2="hello";
    $var3=array("red","blue","green");
    $var4=fopen("test.txt","r");
    class Test {
        function show(){
            echo "This is a test class.";
        }
    }

    var_dump(get_debug_type($var1));
    var_dump(get_debug_type($var2));
    var_dump(get_debug_type($var3));
    var_dump(get_debug_type($var4));
    var_dump(get_debug_type(new Test()));
?>

The output of the above code is as follows:

string(7) "integer"
string(6) "string"
string(5) "array"
string(7) "resource"
string(4) "Test"

As you can see, the get_debug_type() function determines the type of the variable very conveniently. At the same time, it can also be used to determine the implementation class of the interface. The example is as follows:

<?php
    interface TestInterface {
        function show();
    }

    class Test implements TestInterface {
        function show(){
            echo "This is a test class.";
        }
    }

    var_dump(get_debug_type(new Test()));
    var_dump(get_debug_type(new TestInterface() {
        function show(){
            echo "This is a test interface.";
        }
    }));
?>

The output result is as follows:

string(4) "Test"
string(12) "class@anonymous"

It can be seen that the get_debug_type() function can accurately identify the implementation of the class and interface.

In short, the get_debug_type() function is a very useful function built into PHP8, which can be used to accurately determine the type of variables, including scalar, array, resource, object, etc. In PHP development, we often encounter situations where variable types are unclear, and using the get_debug_type() function can greatly improve the readability and stability of the code.

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