Xdebug: [Step Debug] 无法连接到调试客户端。尝试过：localhost:9003（通过 xdebug 回退。client_host/xdebug.client_port）:-(
Xdebug: [Step Debug] Could not connect to debugging client. Tried: localhost:9003 (fallback through xdebug.client_host/xdebug.client_port) :-(
xdebug ang php 此消息的解决方法是什么？
Xdebug: [Step Debug] Could not connect to debugging client. Tried: localhost:9003 (fallback through xdebug.client_host/xdebug.client_port) :-(
当我 运行 composer update 在 WSL2 上安装 UBUNTU 20.01 时出现此消息。
我当前的 php 版本是 php8 和 xdebug3
更新：
这是 x 调试部分
xdebug
__ __ _ _
\ \ / / | | | |
\ V / __| | ___| |__ _ _ __ _
> < / _` |/ _ \ '_ \| | | |/ _` |
/ . \ (_| | __/ |_) | |_| | (_| |
/_/ \_\__,_|\___|_.__/ \__,_|\__, |
__/ |
|___/
Version => 3.0.1
Support Xdebug on Patreon, GitHub, or as a business: https://xdebug.org/support
Feature => Enabled/Disabled
Development Aids => ✘ disabled
Coverage => ✘ disabled
GC Stats => ✘ disabled
Profiler => ✘ disabled
Step Debugger => ✔ enabled
Tracing => ✘ disabled
Debugger => enabled
IDE Key =>
Directive => Local Value => Master Value
xdebug.auto_trace => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.auto_trace" => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.auto_trace"
xdebug.cli_color => 0 => 0
xdebug.client_discovery_header => no value => no value
xdebug.client_host => localhost => localhost
xdebug.client_port => 9003 => 9003
xdebug.cloud_id => no value => no value
xdebug.collect_assignments => Off => Off
xdebug.collect_includes => This setting has been removed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#removed-"xdebug.collect_includes" => This setting has been removed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#removed-"xdebug.collect_includes"
xdebug.collect_params => 0 => 0
xdebug.collect_return => Off => Off
xdebug.collect_vars => This setting has been removed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#removed-"xdebug.collect_vars" => This setting has been removed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#removed-"xdebug.collect_vars"
xdebug.connect_timeout_ms => 200 => 200
xdebug.coverage_enable => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.coverage_enable" => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.coverage_enable"
xdebug.default_enable => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.default_enable" => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.default_enable"
xdebug.discover_client_host => On => On
xdebug.dump.COOKIE => no value => no value
xdebug.dump.ENV => no value => no value
xdebug.dump.FILES => no value => no value
xdebug.dump.GET => no value => no value
xdebug.dump.POST => no value => no value
xdebug.dump.REQUEST => no value => no value
xdebug.dump.SERVER => no value => no value
xdebug.dump.SESSION => no value => no value
xdebug.dump_globals => On => On
xdebug.dump_once => On => On
xdebug.dump_undefined => Off => Off
xdebug.file_link_format => no value => no value
xdebug.filename_format => no value => no value
xdebug.force_display_errors => Off => Off
xdebug.force_error_reporting => 0 => 0
xdebug.gc_stats_enable => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.gc_stats_enable" => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.gc_stats_enable"
xdebug.gc_stats_output_dir => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.gc_stats_output_dir" => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.gc_stats_output_dir"
xdebug.gc_stats_output_name => gcstats.%p => gcstats.%p
xdebug.halt_level => 0 => 0
xdebug.idekey => no value => no value
xdebug.log => no value => no value
xdebug.log_level => 7 => 7
xdebug.max_nesting_level => 256 => 256
xdebug.max_stack_frames => -1 => -1
xdebug.mode => debug => debug
xdebug.output_dir => /mnt/c/www/traces => /mnt/c/www/traces
xdebug.overload_var_dump => This setting has been removed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#removed-"xdebug.overload_var_dump" => This setting has been removed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#removed-"xdebug.overload_var_dump"
xdebug.profiler_append => Off => Off
xdebug.profiler_enable => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.profiler_enable" => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.profiler_enable"
xdebug.profiler_enable_trigger => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.profiler_enable_trigger" => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.profiler_enable_trigger"
xdebug.profiler_enable_trigger_value => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.profiler_enable_trigger_value" => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.profiler_enable_trigger_value"
xdebug.profiler_output_dir => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.profiler_output_dir" => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.profiler_output_dir"
xdebug.profiler_output_name => cachegrind.out.%p => cachegrind.out.%p
xdebug.remote_autostart => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.remote_autostart" => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.remote_autostart"
xdebug.remote_connect_back => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.remote_connect_back" => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.remote_connect_back"
xdebug.remote_enable => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.remote_enable" => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.remote_enable"
xdebug.remote_host => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.remote_host" => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.remote_host"
xdebug.remote_log => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.remote_log" => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.remote_log"
xdebug.remote_log_level => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.remote_log_level" => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.remote_log_level"
xdebug.remote_mode => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.remote_mode" => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.remote_mode"
xdebug.remote_port => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.remote_port" => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.remote_port"
xdebug.remote_timeout => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.remote_timeout" => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.remote_timeout"
xdebug.scream => Off => Off
xdebug.show_error_trace => Off => Off
xdebug.show_exception_trace => Off => Off
xdebug.show_local_vars => Off => Off
xdebug.show_mem_delta => This setting has been removed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#removed-"xdebug.show_mem_delta" => This setting has been removed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#removed-"xdebug.show_mem_delta"
xdebug.start_upon_error => default => default
xdebug.start_with_request => 1 => 1
xdebug.trace_enable_trigger => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.trace_enable_trigger" => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.trace_enable_trigger"
xdebug.trace_enable_trigger_value => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.trace_enable_trigger_value" => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.trace_enable_trigger_value"
xdebug.trace_format => 0 => 0
xdebug.trace_options => 0 => 0
xdebug.trace_output_dir => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.trace_output_dir" => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.trace_output_dir"
xdebug.trace_output_name => trace.%c => trace.%c
xdebug.trigger_value => no value => no value
xdebug.var_display_max_children => 128 => 128
xdebug.var_display_max_data => 512 => 512
xdebug.var_display_max_depth => 3 => 3
来自Xdebug的documentation关于这种错误：
Occurs when Xdebug is trying to connect to a debuging client to start a debugging session.
The debugger could not make a connection to the client. The error message indicates which host and port combinations were tried, and through which configuration options it came to that conclusion.
An example:
Could not connect to debugging client. Tried: ::1:9003 (from REMOTE_ADDR HTTP header), localhost:9003 (fallback through xdebug.client_host/xdebug.client_port)
This message indicates that Xdebug first tried to use ::1:9003 (IPv6's localhost) from the REMOTE_ADDR header, and then it fell back to localhost:9003 as configured with xdebug.client_host and xdebug.client_port.
Suggested solutions:
- Check whether your debugging client is listening on the indicated address and port. On Linux and OSX, you can use
netstat -a -n | grep LISTEN to check.
- Change
xdebug.client_host and/or xdebug.client_port to the right address/hostname and port of where the debugging client is listening.
首先导致该消息的原因：
您有 xdebug.start_with_request = yes（与 Xdebug v2 的 xdebug.remote_autostart = yes 相同）。此选项告诉 Xdebug 尝试调试 每个 request/script 而不管“调试我”标志。
如果 Xdebug 无法连接到调试客户端（来自 xdebug.client_host 和 xdebug.client_port 的值 .. 或自动检测到的主机，如果 xdebug.discover_client_host 已启用）然后它会通知您。
如何防止它出现在我的 screen/in 输出中：
Xdebug 使用标准 PHP 例程来编写此类警告（例如 standard PHP error_log() function). Normally such a message will be written to the standard PHP's error log。看起来您根本没有在 php.ini（空值）中配置它，因此 PHP 将它发送到您的标准输出（因此您仍然有机会看到它，因为它可能很重要）。
解决方案 是将 PHP's error_log ini setting 指向某个有效位置，以便您可以在需要时阅读它（路径取决于您的 OS 和发行版，例如error_log = /var/log/php_error.log 会很常见）。如果您根本不需要这样的日志（有其他日志系统）——请使用 /dev/null 或类似的东西。
您也可以尝试 xdebug.log_level = 0 但这应该会阻止 Xdebug 记录任何内容，即使您指定 xdebug.log.
另请参阅 Xdebug 作者关于“为什么这样工作”的解释：
我正在使用：
xdebug.start_with_request=trigger
在我需要时触发 xdebug（使用浏览器 xdebug 扩展进行 Web 服务器调试）。
或者如果我需要调试 php 脚本（使用 cli），我会使用 phpstorm，配置如下：
通过这种方法，我不会收到此错误并且可以像往常一样使用 xdebug 日志。
不使用时禁用 xdebug 浏览器扩展程序。
我使用 VSCode 调试器。当在 IDE 中关闭调试时，我在每次访问页面时都会在日志中看到错误，因为我的 chrome 浏览器扩展仍在尝试调用 xdebug。
尽管对 xdebug 进行了良好的 php.ini 设置，但仍会发生这种情况，例如：
xdebug.mode=debug
或
xdebug.start_with_request=trigger
两者都记录在此处：Xdebug: Documentation
xdebug ang php 此消息的解决方法是什么？
Xdebug: [Step Debug] Could not connect to debugging client. Tried: localhost:9003 (fallback through xdebug.client_host/xdebug.client_port) :-(
当我 运行 composer update 在 WSL2 上安装 UBUNTU 20.01 时出现此消息。
我当前的 php 版本是 php8 和 xdebug3
更新：
这是 x 调试部分
xdebug
__ __ _ _
\ \ / / | | | |
\ V / __| | ___| |__ _ _ __ _
> < / _` |/ _ \ '_ \| | | |/ _` |
/ . \ (_| | __/ |_) | |_| | (_| |
/_/ \_\__,_|\___|_.__/ \__,_|\__, |
__/ |
|___/
Version => 3.0.1
Support Xdebug on Patreon, GitHub, or as a business: https://xdebug.org/support
Feature => Enabled/Disabled
Development Aids => ✘ disabled
Coverage => ✘ disabled
GC Stats => ✘ disabled
Profiler => ✘ disabled
Step Debugger => ✔ enabled
Tracing => ✘ disabled
Debugger => enabled
IDE Key =>
Directive => Local Value => Master Value
xdebug.auto_trace => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.auto_trace" => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.auto_trace"
xdebug.cli_color => 0 => 0
xdebug.client_discovery_header => no value => no value
xdebug.client_host => localhost => localhost
xdebug.client_port => 9003 => 9003
xdebug.cloud_id => no value => no value
xdebug.collect_assignments => Off => Off
xdebug.collect_includes => This setting has been removed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#removed-"xdebug.collect_includes" => This setting has been removed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#removed-"xdebug.collect_includes"
xdebug.collect_params => 0 => 0
xdebug.collect_return => Off => Off
xdebug.collect_vars => This setting has been removed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#removed-"xdebug.collect_vars" => This setting has been removed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#removed-"xdebug.collect_vars"
xdebug.connect_timeout_ms => 200 => 200
xdebug.coverage_enable => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.coverage_enable" => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.coverage_enable"
xdebug.default_enable => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.default_enable" => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.default_enable"
xdebug.discover_client_host => On => On
xdebug.dump.COOKIE => no value => no value
xdebug.dump.ENV => no value => no value
xdebug.dump.FILES => no value => no value
xdebug.dump.GET => no value => no value
xdebug.dump.POST => no value => no value
xdebug.dump.REQUEST => no value => no value
xdebug.dump.SERVER => no value => no value
xdebug.dump.SESSION => no value => no value
xdebug.dump_globals => On => On
xdebug.dump_once => On => On
xdebug.dump_undefined => Off => Off
xdebug.file_link_format => no value => no value
xdebug.filename_format => no value => no value
xdebug.force_display_errors => Off => Off
xdebug.force_error_reporting => 0 => 0
xdebug.gc_stats_enable => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.gc_stats_enable" => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.gc_stats_enable"
xdebug.gc_stats_output_dir => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.gc_stats_output_dir" => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.gc_stats_output_dir"
xdebug.gc_stats_output_name => gcstats.%p => gcstats.%p
xdebug.halt_level => 0 => 0
xdebug.idekey => no value => no value
xdebug.log => no value => no value
xdebug.log_level => 7 => 7
xdebug.max_nesting_level => 256 => 256
xdebug.max_stack_frames => -1 => -1
xdebug.mode => debug => debug
xdebug.output_dir => /mnt/c/www/traces => /mnt/c/www/traces
xdebug.overload_var_dump => This setting has been removed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#removed-"xdebug.overload_var_dump" => This setting has been removed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#removed-"xdebug.overload_var_dump"
xdebug.profiler_append => Off => Off
xdebug.profiler_enable => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.profiler_enable" => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.profiler_enable"
xdebug.profiler_enable_trigger => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.profiler_enable_trigger" => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.profiler_enable_trigger"
xdebug.profiler_enable_trigger_value => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.profiler_enable_trigger_value" => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.profiler_enable_trigger_value"
xdebug.profiler_output_dir => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.profiler_output_dir" => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.profiler_output_dir"
xdebug.profiler_output_name => cachegrind.out.%p => cachegrind.out.%p
xdebug.remote_autostart => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.remote_autostart" => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.remote_autostart"
xdebug.remote_connect_back => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.remote_connect_back" => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.remote_connect_back"
xdebug.remote_enable => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.remote_enable" => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.remote_enable"
xdebug.remote_host => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.remote_host" => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.remote_host"
xdebug.remote_log => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.remote_log" => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.remote_log"
xdebug.remote_log_level => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.remote_log_level" => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.remote_log_level"
xdebug.remote_mode => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.remote_mode" => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.remote_mode"
xdebug.remote_port => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.remote_port" => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.remote_port"
xdebug.remote_timeout => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.remote_timeout" => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.remote_timeout"
xdebug.scream => Off => Off
xdebug.show_error_trace => Off => Off
xdebug.show_exception_trace => Off => Off
xdebug.show_local_vars => Off => Off
xdebug.show_mem_delta => This setting has been removed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#removed-"xdebug.show_mem_delta" => This setting has been removed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#removed-"xdebug.show_mem_delta"
xdebug.start_upon_error => default => default
xdebug.start_with_request => 1 => 1
xdebug.trace_enable_trigger => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.trace_enable_trigger" => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.trace_enable_trigger"
xdebug.trace_enable_trigger_value => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.trace_enable_trigger_value" => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.trace_enable_trigger_value"
xdebug.trace_format => 0 => 0
xdebug.trace_options => 0 => 0
xdebug.trace_output_dir => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.trace_output_dir" => This setting has been changed, see the upgrading guide at https://xdebug.org/docs/upgrade_guide#changed-"xdebug.trace_output_dir"
xdebug.trace_output_name => trace.%c => trace.%c
xdebug.trigger_value => no value => no value
xdebug.var_display_max_children => 128 => 128
xdebug.var_display_max_data => 512 => 512
xdebug.var_display_max_depth => 3 => 3
来自Xdebug的documentation关于这种错误：
Occurs when Xdebug is trying to connect to a debuging client to start a debugging session.
The debugger could not make a connection to the client. The error message indicates which host and port combinations were tried, and through which configuration options it came to that conclusion.
An example:
Could not connect to debugging client. Tried:
::1:9003(fromREMOTE_ADDRHTTP header),localhost:9003(fallback throughxdebug.client_host/xdebug.client_port)This message indicates that Xdebug first tried to use
::1:9003(IPv6's localhost) from the REMOTE_ADDR header, and then it fell back tolocalhost:9003as configured withxdebug.client_hostandxdebug.client_port.Suggested solutions:
- Check whether your debugging client is listening on the indicated address and port. On Linux and OSX, you can use
netstat -a -n | grep LISTENto check.- Change
xdebug.client_hostand/orxdebug.client_portto the right address/hostname and port of where the debugging client is listening.
首先导致该消息的原因：
您有 xdebug.start_with_request = yes（与 Xdebug v2 的 xdebug.remote_autostart = yes 相同）。此选项告诉 Xdebug 尝试调试 每个 request/script 而不管“调试我”标志。
如果 Xdebug 无法连接到调试客户端（来自 xdebug.client_host 和 xdebug.client_port 的值 .. 或自动检测到的主机，如果 xdebug.discover_client_host 已启用）然后它会通知您。
如何防止它出现在我的 screen/in 输出中：
Xdebug 使用标准 PHP 例程来编写此类警告（例如 standard PHP error_log() function). Normally such a message will be written to the standard PHP's error log。看起来您根本没有在 php.ini（空值）中配置它，因此 PHP 将它发送到您的标准输出（因此您仍然有机会看到它，因为它可能很重要）。
解决方案 是将 PHP's error_log ini setting 指向某个有效位置，以便您可以在需要时阅读它（路径取决于您的 OS 和发行版，例如error_log = /var/log/php_error.log 会很常见）。如果您根本不需要这样的日志（有其他日志系统）——请使用 /dev/null 或类似的东西。
您也可以尝试 xdebug.log_level = 0 但这应该会阻止 Xdebug 记录任何内容，即使您指定 xdebug.log.
另请参阅 Xdebug 作者关于“为什么这样工作”的解释：
我正在使用：
xdebug.start_with_request=trigger
在我需要时触发 xdebug（使用浏览器 xdebug 扩展进行 Web 服务器调试）。
或者如果我需要调试 php 脚本（使用 cli），我会使用 phpstorm，配置如下：
通过这种方法，我不会收到此错误并且可以像往常一样使用 xdebug 日志。
不使用时禁用 xdebug 浏览器扩展程序。
我使用 VSCode 调试器。当在 IDE 中关闭调试时，我在每次访问页面时都会在日志中看到错误，因为我的 chrome 浏览器扩展仍在尝试调用 xdebug。
尽管对 xdebug 进行了良好的 php.ini 设置，但仍会发生这种情况，例如：
xdebug.mode=debug
或
xdebug.start_with_request=trigger
两者都记录在此处：Xdebug: Documentation