php - 函数的 PDO 错误

Question

您好，我第一次使用 PDO 并出现错误……不，我错在哪里，这是我的代码

function student_one_image($student_id){
    $DBH = new PDO("mysql:host=$host;dbname=$dbname", $user, $pass);
    $STH = $DBH->query("SELECT * from school_students, school_student_one_image where (school_student_one_image.student_id = school_students.student_id) 
    and school_student_one_image.student_id = '$student_id'");
    $STH->setFetchMode(PDO::FETCH_ASSOC);
    $row = $STH->fetch();
    return $row

错误是 Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock

如果我正在尝试使用 mysql 它可以工作

function student_one_image($student_id){
    $data= mysql_query("SELECT * from school_students, school_student_one_image where (school_student_one_image.student_id = school_students.student_id) 
    and school_student_one_image.student_id = '$student_id'");
    $result = mysql_fetch_array($data);
    return $result;

请帮忙

score 3 · Accepted Answer

您的变量$host、$dbname和超出范围 [1] 因为您在函数中使用它们。您可以像这样传递它们：$user$pass

function student_one_image($student_id, $host, $dbname, $user, $pass) {

或者通过将以下行添加到函数顶部来更改它们的范围：

global $host, $dbname, $user, $pass;

[1] http://php.net/manual/en/language.variables.scope.php

php - 函数的 PDO 错误

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