Solving PHP error: Trying to call a non-object method

Solution to PHP error: Try to call a non-object method

In the process of using PHP development, we often encounter some error messages, one of which is "try Calling a method of a non-object". This error means that when we try to call a method, the object used is not a legal object. This article will introduce some common causes and solutions to help you solve this problem.

1. Check whether the object is correctly initialized

A common reason is that we did not initialize the object correctly before calling the method. For example, after instantiating a class, we forget to use the keyword "new" to create an instance of the object. Therefore, when calling the object's method, an error will be reported.

Here is a sample code:

class Example{
    public function test(){
        echo "调用成功！";
    }
}

$example = Example;  // 错误的初始化方式，忘记了关键字“new”
$example->test();    // 报错：尝试调用非对象的方法

Fixing this problem simply requires adding the keyword "new" when instantiating the object. The repaired code is as follows:

class Example{
    public function test(){
        echo "调用成功！";
    }
}

$example = new Example;  // 正确的初始化方式
$example->test();        // 正常输出：调用成功！

2. Check whether the object is null

Another common reason is that we do not null the object before calling the method deal with. If we try to call a method on an object that is null, an error will be reported.

The following is a sample code:

class Example{
    public function test(){
        echo "调用成功！";
    }
}

$example = null;
$example->test();  // 报错：尝试调用非对象的方法

To fix this problem, you only need to add a null condition before calling the method. The repaired code is as follows:

class Example{
    public function test(){
        echo "调用成功！";
    }
}

$example = null;
if($example != null){
    $example->test();    // 不会报错，因为已经进行了判空处理
}

3. Check whether the object is of the correct type

Another situation is that when we try to call a method, the object used is not Not the type we expected. In this case, we usually use type checking to avoid this error.

The following is a sample code:

class Example{
    public function test(){
        echo "调用成功！";
    }
}

$str = "Hello World";
$str->test();  // 报错：尝试调用非对象的方法

In this example, we actually want to call the method of the object, but we use a string. To solve this problem, we can use type checking to ensure that the object we are using is of the correct type.

To fix this problem simply use the is_object() function to perform type checking. The repaired code is as follows:

class Example{
    public function test(){
        echo "调用成功！";
    }
}

$str = "Hello World";
if(is_object($str)){
    $str->test();    // 不会报错，因为已经进行了类型检查
}

Summary:

During the PHP development process, when we encounter the error "trying to call a non-object method", we can first check whether the object Initialized correctly, null, and of the correct type. Adopting corresponding solutions according to the specific situation can effectively solve this problem. I hope this article can help you solve common problems in PHP error reporting and improve development efficiency.

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