我正在尝试为 PHP 编写一个自定义 SESSION 类,以将会话移动到数据库中并远离文件系统。只有在调用_read()
闭包时才会在方法中引发错误。$connect2DB
在所有其他方法中,调用$connect2DB
不会导致任何错误。此外,如果我自己将类实例化为对象,则所有方法(包括臭名昭著的方法)都_read()
按预期工作。你能找到错误吗?
我有以下代码:
class sessionDBHandler {
public function __construct() {
session_set_save_handler(
array($this, "_open"),
array($this, "_close"),
array($this, "_read"),
array($this, "_write"),
array($this, "_destroy"),
array($this, "_gc")
);
register_shutdown_function('session_write_close');
}
public function _open() {
global $sessCon;
global $HOST;
global $USER;
global $PW;
global $DATABASE;
$sessCon=new mysqli($HOST,$USER,$PW,$DATABASE); //mysqli connection
}
public function _close() {
global $sessCon;
$sessCon->close();
}
public function _read($id) {
global $sessCon;
global $connect2DB;
global $SESSIONTAB;
$qRes=$connect2DB($sessCon,'select `data` from `'.$SESSIONTAB.'` where `ID`=?',array("s",$id)); //<-- error message here
if(!empty($qRes["res"][0]["data"])) return $qRes["res"][0]["data"];
else return '';
}
public function _write($id,$data) {
global $sessCon;
global $connect2DB;
global $SESSIONTAB;
$qRes=$connect2DB($sessCon,'select `ID` from `'.$SESSIONTAB.'` where `ID`=?',array("s",$id));
$param=array(); //buliding SQL query parameters
$param[0]="sis";
$param[]=$id;
$param[]=time();
$param[]=$data;
if(!empty($qRes["res"][0]["ID"])) {
$param[0].="s";
$param[]=$id;
}
$qRes=$connect2DB($sessCon,(!empty($qRes["res"][0]["ID"]) ? 'update' : 'insert').' `'.$SESSIONTAB.'` set `ID`=?, `access`=?, `data`=?'.(!empty($qRes["res"][0]["ID"]) ? ' where `ID`=?' : ''),$param);
if($qRes["info"]["affectedRows"]>0) return true;
else return '';
}
public function _destroy($id) {
global $sessCon;
global $connect2DB;
global $SESSIONTAB;
$qRes=$connect2DB($sessCon,'delete from `'.$SESSIONTAB.'` where `ID`=?',array("s",$id));
if($qRes["info"]["affectedRows"]>0) return true;
else return '';
}
public function _gc($max) {
global $sessCon;
global $connect2DB;
global $SESSIONTAB;
$qRes=$connect2DB($sessCon,'delete from `'.$SESSIONTAB.'` where `access`<?',array("i",(time()-$max)));
if($qRes["info"]["affectedRows"]>0) return true;
else return '';
}
}
我告诉 PHP 它在哪里找到这些函数(在session_start()
此处调用之前:
new sessionDBHandler();
我的问题似乎是我用作 MySQL 抽象层的闭包。我得到的错误是:
Fatal error: Function name must be a string in /Users/user/Sites/script.php on line 401
这向我表明它以某种方式无法找到 $connect2DB 的命名空间。问题是,如果我在没有 __constructor 及其session_set_save_handler
指令的情况下调用这些函数,它会正常工作:
$test=new sessionDBHandler();
$test->_open();
echo $test->_read("d6e08112ff6fc8a7eb6e76832327bf81");
$test->_close();
以上工作没有错误。现在我在这里使用闭包,因为我必须保持这个脚本的占用空间非常低,并且在脚本底部取消设置 $connect2DB 以及其他原因,所以我希望保留当前的抽象层。
任何想法我可以在这里做什么?
感谢大家!
也许在调用会话时 $connect2DB 没有初始化?
连接2DB
/**
* Simple MySQLi abstraction layer
*
* @param resource $mysqli The MySQLi connection link
* @param string $query The MySQL query for prepaired statement
* @param array $v The parameters to replace ? in $query. First element must be the type
* @param integer $o Option for more debug infos [0]=no infos(default) [1]=adding debug infos
*
* @return array [for select]=associative array of table result [for everything else]=associative array with affectedRows,info and insertID
*
* @author Dominik Wilkowski
*/
$connect2DB=function($mysqli,$query,$v=array(),$o=0) {
if($mysqli->connect_errno) {
return array('info'=>array('error'=>'Connect failed: '.$mysqli->connect_error)); //error handling here
exit();
}
if($v && (substr_count($query,"?")!=strlen($v[0]) || strlen($v[0])!=((count($v)-1)>=0 ? (count($v)-1) : 0))) {
return array('info'=>array('error'=>'Placeholders are unequal! placeholders:'.substr_count($query,"?").', replacements:'.strlen($v[0]).', param:'.(count($v)-1).' ('.$v[0].')')); //error handling here...
exit();
}
if($res=$mysqli->prepare($query)) {
//dynamically bind all $v
if($v) {
$values=array($v[0]);
for($i=1; $i<count($v); $i++) {
${'bind'.$i}=$v[$i];
$values[]=&${'bind'.$i};
}
call_user_func_array(array($res,'bind_param'),$values);
}
$res->execute();
//bind all table rows to result
if(strtolower(substr($query,0,6))=="select") {
$field=$fields=$tempRow=array();
$meta=$res->result_metadata();
while($field=$meta->fetch_field()) {
$fieldName=$field->name;
$fields[]=&$tempRow[$fieldName];
}
$meta->free_result();
call_user_func_array(array($res,"bind_result"),$fields);
//return associative array
$results=array();
$i=0;
while($res->fetch()) {
$results["res"][$i]=array();
foreach($tempRow as $k=>$v2) $results["res"][$i][$k] = $v2;
$i++;
}
$res->free_result();
}
else { //return infos about the query
if($mysqli->warning_count) {
if($err=$mysqli->query("SHOW WARNINGS")) {
$row=$err->fetch_row();
$results["info"]["error"].=$row[0].' ('.$row[1].'): '.$row[2];
$err->close();
}
}
$results["info"]["affectedRows"]=$mysqli->affected_rows;
$results["info"]["info"]=$mysqli->info;
$results["info"]["insertID"]=$mysqli->insert_id;
}
$res->close();
}
if($o===1) { //adding debug infos
$q=$query;
for($i=1;$i<count($v);$i++) $q=preg_replace("/\?/",(substr($v[0],($i-1),1)=="s" ? '"' : '').$v[$i].(substr($v[0],($i-1),1)=="s" ? '"' : ''),$q,1);
$results["info"]["query"]=$q;
$results["info"]["param"]=json_encode($v);
}
if(strtolower(substr($query,0,6))=="update" || strtolower(substr($query,0,6))=="delete") { //optimize at update and delete
preg_match_all('/((update|delete) `(.*)` )/i',$query,$tables);
foreach($tables[3] as $t) $mysqli->query('OPTIMIZE TABLE '.$t);
}
return $results;
};
更新#2
我们之前的测试表明,命名空间确实在运行时似乎没有被初始化,_read()
所以我写了一个小测试用例来仔细检查。
<?php
$LOGIN='login credentials';
//Closure
$nob=function() {
return 'closure running!<br>';
};
//Session handler
class sessionDBHandler {
public function __construct() {
session_set_save_handler(
array($this, "_open"),
array($this, "_close"),
array($this, "_read"),
array($this, "_write"),
array($this, "_destroy"),
array($this, "_gc")
);
register_shutdown_function('session_write_close');
}
public function _open() {
global $sessCon;
global $LOGIN;
echo '_open running with: '.$LOGIN.'<br>';
$sessCon='connection established!<br>';
}
public function _close() {
global $sessCon;
echo $sessCon='connection closed!<br>';
}
public function _read($id) {
global $sessCon;
global $nob;
echo $nob();
echo 'requested id is: '.$id.'<br>';
echo 'sessCon is: '.$sessCon;
}
public function _write($id,$data) {
global $sessCon;
echo 'requested id is: '.$id.' and data: '.$data.'<br>';
echo 'sessCon is: '.$sessCon;
}
public function _destroy($id) {
global $sessCon;
echo 'requested id is: '.$id.'<br>';
echo 'sessCon is: '.$sessCon;
}
public function _gc($max) {
global $sessCon;
echo 'requested max is: '.$max.'<br>';
echo 'sessCon is: '.$sessCon;
}
}
new sessionDBHandler();
session_start();
?>
有趣的是,这将毫无错误地运行并输出:
_open running with: login credentials
closure running!
requested id is: 746b70a979d9ef8c6686e659707b4b38
sessCon is: connection established!
requested id is: 746b70a979d9ef8c6686e659707b4b38 and data:
sessCon is: connection established!
connection closed!
现在这表明我的特定实现似乎存在错误。非常欢迎想要尝试的人加入:)
更新#3
我想在我运行我的应用程序后取消我的关闭,因此unset($connect2DB);
在脚本的最底部。然而,这似乎以某种方式导致了“过早”的不安。删除它将删除错误。
然而
有没有办法在脚本运行后安全地取消我的关闭,这样它就不会流入主脚本?