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In PHP, the cli_get_process_title function is used to retrieve the title of the current command-line process, making it easier for developers to distinguish between different processes in multi-process or daemon environments. However, many developers encounter the issue of cli_get_process_title outputting garbled characters. This not only affects debugging but can also lead to cluttered log information. This article will analyze the common causes of this problem and provide practical solutions.
cli_get_process_title is a PHP function that retrieves the title of the current command-line (CLI) process. It relies on the underlying operating system's interfaces to get the process name, typically used in daemon or multi-process tasks for monitoring and management.
Example code:
<?php
$title = cli_get_process_title();
echo "The current process title is: " . $title . "\n";
?>
The main reasons for garbled output from cli_get_process_title are as follows:
Most Linux systems use UTF-8 encoding by default. However, some terminals or system environment variables, such as LANG or LC_ALL, may not be configured correctly, causing the output string to be improperly parsed.
The cli_get_process_title function has been supported since PHP 5.5, but different PHP versions or different SAPIs (such as CLI or FPM) may vary in their support for the function, which could result in abnormal output.
If the title is set using cli_set_process_title in the code and the title string contains non-ASCII characters without proper encoding, it can also lead to garbled output when cli_get_process_title reads it.
Sometimes the issue lies with the terminal display or log tools that cannot recognize certain character sets, leading to garbled characters when displayed.
Ensure that both the operating system and terminal are using a unified encoding that supports UTF-8.
echo $LANG
# The output should be something like zh_CN.UTF-8
If it is not UTF-8, modify the settings in /etc/default/locale or ~/.bashrc:
export LANG=zh_CN.UTF-8
export LC_ALL=zh_CN.UTF-8
When setting the title, convert the string to UTF-8 encoding.
<?php
$title = "My Process Title";
cli_set_process_title(mb_convert_encoding($title, 'UTF-8', 'auto'));
?>
Try to use characters within the ASCII range for process titles to reduce encoding parsing complexity.
If cli_get_process_title consistently fails to output correctly, consider using an operating system command to get the process name, such as the ps command in Linux.
Example:
<?php
$pid = getmypid();
$cmd = "ps -p $pid -o comm=";
$processName = trim(shell_exec($cmd));
echo "The current process name: " . $processName . "\n";
?>
Make sure your PHP version supports the cli_get_process_title function. It is recommended to upgrade to PHP 7.x or later versions. Also, ensure that the running environment is CLI SAPI.
Garbled output from cli_get_process_title is usually caused by mismatched encoding environments and improper title configuration. Developers should ensure the system environment uses UTF-8 encoding, use correct encoding when setting process titles, and avoid complex characters. Additionally, using operating system commands as an alternative method to retrieve process information can be a good solution.
<?php
// Set process title (ensure it is UTF-8 encoded)
$title = "My Process Title";
cli_set_process_title(mb_convert_encoding($title, 'UTF-8', 'auto'));
<p>// Get process title<br>
$processTitle = cli_get_process_title();<br>
echo "The current process title: " . $processTitle . "\n";</p>
<p>// If cli_get_process_title is garbled, use system command as a replacement<br>
$pid = getmypid();<br>
$cmd = "ps -p $pid -o comm=";<br>
$processName = trim(shell_exec($cmd));<br>
echo "The current process name: " . $processName . "\n";<br>
?><br>
PHP Official Documentation: https://m66.net/manual/en/function.cli-get-process-title.php
