今天给大家介绍一下怎么使用gdb调试php。文章的内容小编觉得不错，现在给大家分享一下，觉得有需要的朋友可以了解一下，希望对大家有所帮助，下面跟着小编的思路一起来阅读吧。
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使用gdb调试php 简介 gdb 是c语言的代码调试工具 调试主要有4种形式 gdb：启动之后用attach pid 追踪程序
gdb [options] [executable-file [core-file or process-id]]
gdb [options] --args executable-file [inferior-arguments ...]
gdb [options] [--python|-P] script-file [script-arguments ...] 常用调试命令 attach pid 例：如果向跟踪调试mysql代码 1.先找到mysql进行ID：10111
2.再attach 10111追踪mysql
layout 显示源码/汇编指令
Layout names are:
src : Displays source and command windows. 显示源码
asm : Displays disassembly and command windows. 显示汇编指令
split : Displays source, disassembly and command windows. 显示源码和汇编指令
regs : Displays register window. If existing layout
is source/command or assembly/command, the
register window is displayed. If the
source/assembly/command (split) is displayed,
the register window is displayed with
the window that has current logical focus break b 增加断点
info b 显示断点信息
delete num 删除指定断点
continue [num] next [num] step [num] backtrace print [value] help 调试php代码 1. 新增一个php文件 2.查看php-fpm work进程PID 我这里通过修改php-fpm配置只启动一个work进程方便追踪
pm = static
pm.max_children = 1 [root@test ~]# ps aux|grep php-fpm
www 1127 0.0 0.1 279352 2816 ? S 5月12 0:00 php-fpm: pool www
root 12224 0.0 0.0 112736 976 pts/0 S+ 17:37 0:00 grep --color=auto php-fpm 3.追踪PID [root@test ~]# gdb
GNU gdb (GDB) Red Hat Enterprise Linux 7.6.1-115.el7
Copyright (C) 2013 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law. Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-redhat-linux-gnu".
For bug reporting instructions, please see:
4.打断点，这里在timelib_update_ts和do_years方法打了一个断点，这里需要你看下php源码，看你需要在哪里调试代码 (gdb) b timelib_update_ts
Breakpoint 1 at 0x48ba90: file /opt/lnmp1.6/src/php-7.3.11/ext/date/lib/tm2unixtime.c, line 499. (gdb) b do_years
`Breakpoint 3 at 0x48bb95: file /opt/lnmp1.6/src/php-7.3.11/ext/date/lib/tm2unixtime.c, line 381.` 5.请求测试文件 请求之后发现没有立刻看到返回结果，被阻塞在了这里，说明执行到了断点的地方
[root@test ~]# curl localhost/3.php 6.查看调试信息 通过p *time可以看到变量time里面的内容
(gdb) c
Continuing.
Breakpoint 1, timelib_update_ts (time=time@entry=0x7fc63ec02000, tzi=tzi@entry=0x7fc63ec75000)
at /opt/lnmp1.6/src/php-7.3.11/ext/date/lib/tm2unixtime.c:499
499 {
(gdb) c
Continuing.
Breakpoint 3, timelib_update_ts (time=time@entry=0x7fc63ec02000, tzi=tzi@entry=0x7fc63ec75000)
at /opt/lnmp1.6/src/php-7.3.11/ext/date/lib/tm2unixtime.c:505
505 res += do_years(time->y);
(gdb) s
do_years (year=2020) at /opt/lnmp1.6/src/php-7.3.11/ext/date/lib/tm2unixtime.c:381
381 eras = (year - 1970) / 40000;
(gdb) s
timelib_update_ts (time=time@entry=0x7fc63ec02000, tzi=tzi@entry=0x7fc63ec75000)
at /opt/lnmp1.6/src/php-7.3.11/ext/date/lib/tm2unixtime.c:504
504 do_adjust_special(time);
(gdb) p *time
$1 = {y = 2020, m = 7, d = 31, h = 0, i = 0, s = 0, us = 0, z = 28800, tz_abbr = 0x7fc63ec71018 "CST",
tz_info = 0x7fc63ec75000, dst = 0, relative = {y = 0, m = 2,
d = 0, h = 0, i = 0, s = 0, us = 0, weekday = 0, weekday_behavior = 0, first_last_day_of = 2, invert = 0,
days = -99999, special = {type = 0, amount = 0},
have_weekday_relative = 0, have_special_relative = 0}, sse = 0, have_time = 0, have_date = 0, have_zone = 0,
have_relative = 1, have_weeknr_day = 0,
sse_uptodate = 0, tim_uptodate = 0, is_localtime = 1, zone_type = 3}
(gdb) 下面是do_years方法的代码
static timelib_sll do_years(timelib_sll year)
{
timelib_sll i;
timelib_sll res = 0;
timelib_sll eras;
eras = (year - 1970) / 40000;
if (eras != 0) {
year = year - (eras * 40000);
res += (SECS_PER_ERA * eras * 100);
}
if (year >= 1970) {
for (i = year - 1; i >= 1970; i--) {
//判断是否是闰年，闰年366天，平年365天
if (timelib_is_leap(i)) {
res += (DAYS_PER_LYEAR * SECS_PER_DAY);
} else {
res += (DAYS_PER_YEAR * SECS_PER_DAY);
}
}
} else {
for (i = 1969; i >= year; i--) {
if (timelib_is_leap(i)) {
res -= (DAYS_PER_LYEAR * SECS_PER_DAY);
} else {
res -= (DAYS_PER_YEAR * SECS_PER_DAY);
}
}
}
return res;
} 总结 通过gdb追踪很方便我们debug代码信息，查看底层代码跳用栈，对学习源码有很大的帮助366，不是则86400 355 (86400是一天的秒数)，月天时分秒计算逻辑不再累述，最后还会加上/减去时区，上海是东八区会减去8小时。 = 1970; $i--) {
if (is_leap($i)) {
$res += YEARLEEP * 86400;
} else {
$res += YEAR * 86400;
}
}
//上海是东八区要减8小时
$res -= 8 * 3600;
return $res;
}
echo getStime('2020'); 以上就是怎么使用gdb调试php的全部内容了，更多与怎么使用gdb调试php相关的内容可以搜索创新互联之前的文章或者浏览下面的文章进行学习哈！相信小编会给大家增添更多知识,希望大家能够支持一下创新互联！
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