php 之 Object of class stdClass could not be conver

封面图 • 2025-11-13 • PHP

The error message:

```
Object of class stdClass could not be converted
```

typically occurs in PHP when you're trying to convert an object of type `stdClass` (which is a generic empty class used for objects) into a string or another type that it's not compatible with.

### Common Scenarios

#### 1. **Trying to echo or concatenate an object**
```php
$obj = new stdClass();
$obj->name = "John";
echo $obj; // This will throw the error
```

**Fix:**
You need to access the properties of the object:
```php
echo $obj->name; // Correct
```

#### 2. **Passing an object to a function expecting a string**
```php
function myFunction($str) {
    echo $str;
}

$obj = new stdClass();
myFunction($obj); // Error: Object of class stdClass could not be converted
```

**Fix:**
Make sure to pass a string instead:
```php
myFunction($obj->name);
```

#### 3. **Trying to use an object in a context where a string is expected, like `json_encode()` without proper handling**
If you're trying to encode an object to JSON and it's not working as expected, it might be because the object is not properly structured.

```php
$obj = new stdClass();
$obj->key = "value";
echo json_encode($obj); // This is fine
```

But if you try to do something like this:
```php
echo (string) $obj; // Error
```

**Fix:**
Use the object's properties instead:
```php
echo (string) $obj->key;
```

---

### Summary

| Cause | Fix |
|------|-----|
| Trying to echo or concatenate an object directly | Access its properties (`$obj->property`) |
| Passing an object where a string is expected | Use `$obj->property` instead |
| Casting an object to a string (`(string) $obj`) | Avoid casting; use properties |

Let me know if you can share the specific line of code that's causing the error — I can give you a more precise fix!