我最近在我的 WordPress 网站上注意到我有时会收到 500 内部服务器错误.我检查了日志,我有很多行,例如:
I noticed recently on my WordPress website I'm getting sometimes 500 Internal Server Error. I checked logs and I have many lines like:
[2016 年 10 月 3 日星期一 01:25:24.357439] [fcgid:warn] [pid 12840] [client83.27.211.107:36968] mod_fcgid:stderr:PHP 致命错误:允许的内存大小为 536870912 字节已用尽(尝试分配 77 字节)在/var/www/vhosts/mywebsite/public_html/wp-includes/wp-db.php 上线1832
[Mon Oct 03 01:25:24.357439 2016] [fcgid:warn] [pid 12840] [client 83.27.211.107:36968] mod_fcgid: stderr: PHP Fatal error: Allowed memory size of 536870912 bytes exhausted (tried to allocate 77 bytes) in /var/www/vhosts/mywebsite/public_html/wp-includes/wp-db.php on line 1832
我尝试增加内存限制:
定义('WP_MAX_MEMORY_LIMIT', '512M');
define( 'WP_MAX_MEMORY_LIMIT' , '512M' );
define('WP_MEMORY_LIMIT', '512M');
define( 'WP_MEMORY_LIMIT' , '512M' );
甚至更多,但它没有用.无论我设置什么,它仍然超出内存限制一些字节.我认为对数据库的某些查询存在问题,但如何检查?
And even more, but it didn't work. No matter what I set it still exceeding memory limit by some bytes. I think there's a problem with some queries to a database, but how to check which?
includes/wp-db.php 的内容:
Content of the includes/wp-db.php:
} else {
$num_rows = 0;
if ( $this->use_mysqli && $this->result instanceof mysqli_result ) {
while ( $row = mysqli_fetch_object( $this->result ) ) {
$this->last_result[$num_rows] = $row;
$num_rows++;
}
} elseif ( is_resource( $this->result ) ) {
// server crashing at line below
while ( $row = mysql_fetch_object( $this->result ) ) {
$this->last_result[$num_rows] = $row;
$num_rows++;
}
}
// Log number of rows the query returned
// and return number of rows selected
$this->num_rows = $num_rows;
$return_val = $num_rows;
}
问题是由 iThemes Security 插件引起的.我把它关掉了,错误就消失了.如果我知道这个插件的哪一部分导致超出内存限制,我会进一步调查这个问题并编辑这个答案.
The problem was caused by iThemes Security plugin. I turned off it and errors have gone. I'll investigate this problem more and edit this answer if I'll know what part of this plugin caused exceeding memory limit.
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