php 类 stdClass 的对象无法转换为字符串
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Object of class stdClass could not be converted to string
提问by Tomas Smith
I dont know why but I get this error :
我不知道为什么，但我收到此错误：
Catchable fatal error: Object of class stdClass could not be converted to string
可捕获的致命错误：无法将类 stdClass 的对象转换为字符串
For this code:
对于此代码：
$sql = "SELECT * FROM player ORDER BY score DESC LIMIT $begin";
$arr = array();
while($obj = mysql_fetch_object(mysql_query($sql))) {
//$arr[] = $obj;
echo $obj;
}
回答by jmlnik
You're using mysql_fetch_object(which returns an object) and then trying to output it as a string. That won't work.
您正在使用mysql_fetch_object（返回一个对象），然后尝试将其作为字符串输出。那行不通。
In your case, you should use a function that is capable of printing the contents of the object. There are many but the most straight-forward ones are print_ror var_dump. if you're outputting in an HTML context, you might wan to wrap a <pre>tag around the output to make it more readable or click "View source" in your browser.
在您的情况下，您应该使用能够打印对象内容的函数。有很多，但最直接的是print_r或var_dump。如果您在 HTML 上下文中输出，您可能希望<pre>在输出周围包裹一个标签以使其更具可读性，或者在浏览器中单击“查看源代码”。
If you're writing your own objects, they can also be "converted" to strings by implementing the __toString()magic method
如果您正在编写自己的对象，也可以通过实现魔术方法将它们“转换”为字符串__toString()
Also, as people have said in the comments, your code will run the query on each pass through the loop. Check out the documentation hereand read the examples.
此外，正如人们在评论中所说，您的代码将在每次通过循环时运行查询。查看此处的文档并阅读示例。
Note: You might have simplified the example for SO's sake, but make sure to sanitize your variables (e.g. $begin) to avoid SQL injections!
注意：为了 SO，您可能已经简化了示例，但请确保清理您的变量（例如$begin）以避免 SQL 注入！
回答by Dor Shemer
Use print_ror var_dumpinstead of echo
使用print_r或var_dump代替echo
