警告:mysqli_stmt :: close()[mysqli-stmt.close]:无效的对象或资源mysqli_stmt ...为什么? [英] Warning: mysqli_stmt::close() [mysqli-stmt.close]: invalid object or resource mysqli_stmt... why?

问题描述

出于学习目的，为什么php会哭泣以下代码并给出以下警告:

for learning purposes, why does php cries about the following code and gives the following warning:

Warning: mysqli_stmt::close() [mysqli-stmt.close]: invalid object or resource mysqli_stmt in C:\public_html\admin\disctrack.php on line 14


12    $conn = connect('w'); // connect to a database in write mode
13    $stmt = $conn->stmt_init(); // initialize a prepared statement
14    $stmt->close(); // close statement

推荐答案

来自 mysqli :: stmt_init文档:

任何对mysqli_stmt函数的后续调用都将失败，直到调用mysqli_stmt_prepare()为止.

Any subsequent calls to any mysqli_stmt function will fail until mysqli_stmt_prepare() was called.

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