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There is no single PHP error-log filename on Linux. The correct destination depends on the PHP SAPI handling the request (CLI, Apache, CGI or PHP-FPM), the active configuration, and whether logging is directed to a file, syslog, journald or standard error. Start by reading the effective configuration for the SAPI that actually runs your code; do not assume that a path such as /var/log/php_errors.log exists.
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PHP’s error_log setting can name a file, use the special value syslog, or be empty. When it is empty, PHP hands errors to the active SAPI logger, which may be Apache’s error log or the CLI process’s stderr. NGINX has a separate error_log setting, while PHP-FPM pools can add worker and slow-request logs of their own.
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The file you edit is less important than the configuration PHP loaded for the failing request. A command-line script and a web request commonly use different php.ini files, and separate PHP-FPM pools may override global values.
Check the CLI SAPI
Run these commands as the same user and on the same host where the script runs:
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php --ini
php -i | grep -E 'log_errors|error_log|Loaded Configuration File'php --ini shows the main file and scanned additional-ini directory. The second command prints the loaded configuration file and the effective values for log_errors and error_log. If the command reports error_log => no value, PHP is not configured with a dedicated file and will use the CLI SAPI logger, normally the terminal’s standard error stream.
Check the web SAPI
A CLI result does not prove where a browser request is logged. For a temporary diagnostic page, expose phpinfo() only to a trusted administrator, inspect the “Loaded Configuration File,” “Additional .ini files parsed,” “log_errors,” and “error_log” rows, then remove or protect the page immediately. You can also inspect the PHP-FPM pool configuration and the service unit, because pool-level directives can override global PHP settings.
Confirm that the request reaches the expected SAPI. A site served by NGINX normally passes PHP to PHP-FPM; an Apache installation may use an embedded PHP module or proxy to FPM. A command-line test, an Apache module and an FPM pool can therefore produce different destinations for the same script.
Interpret the error_log value
| Effective value | Where to look | What it means |
|---|---|---|
Absolute file path, such as /var/log/myapp/php-error.log |
That exact file | PHP appends errors there, provided the service account can open the file and traverse its parent directories. |
| Relative file path | The path resolved by the running SAPI and process environment | It is a file destination, but the resulting absolute location can differ between CLI, Apache and FPM. Resolve it from the service configuration rather than guessing. |
syslog |
The host’s system logger, often queried through journald or a syslog collector | PHP sends messages to the operating-system logger instead of creating a PHP-specific file. |
| Empty or “no value” | The active SAPI logger: Apache’s error log, CLI stderr, or another server logger |
PHP has no dedicated destination configured. |
The PHP documentation defines error_log as the file used for script errors, notes that the file must be writable by the web-server user, and documents syslog as the system-logger destination. See PHP Runtime Configuration. The log_errors directive must also be enabled; otherwise ordinary PHP errors are not written to the configured destination.
Apache: locate the server error log
When PHP runs as an Apache module and PHP’s error_log is unset, messages may appear in Apache’s configured error log. Apache’s ErrorLog directive sets the file receiving server errors, as documented by the Apache HTTP Server 2.4 core documentation.
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Find the active ErrorLog directive
Search the configuration tree used by your distribution:
sudo grep -RIn --include='*.conf' '^[[:space:]]*ErrorLog' /etc/apache2 /etc/httpd 2>/dev/nullRead the global configuration and the virtual-host block serving the affected site. A virtual host can override the global destination, so the first path you find is not necessarily the one receiving this request. Typical package layouts include an Apache error.log under /var/log/apache2/ on Debian-derived systems or under /var/log/httpd/ on Red Hat-derived systems, but the active ErrorLog line is authoritative.
Watch the file while reproducing the error
sudo tail -f /path/from/ErrorLogTrigger one controlled failing request and watch for a new line. If nothing appears, verify that the request is using this virtual host, that PHP’s log_errors is enabled, and that the process can write the destination. Apache errors unrelated to PHP can also appear in the same file, so identify the timestamp, virtual host and request path before drawing conclusions.
NGINX and PHP-FPM: two logging layers
NGINX and PHP-FPM are separate processes. NGINX logs connection, proxy and configuration failures; PHP-FPM runs the PHP code and can log PHP errors, worker failures and slow requests. A missing PHP exception in NGINX’s file does not prove that PHP generated no error.
Determine NGINX’s compiled-in default
nginx -V 2>&1 | sed -n 's/.*--error-log-path=([^ ]*).*/1/p'NGINX documents a default of logs/error.log, while the absolute path depends on the operating system and installation method. Distribution packages commonly resolve it to /var/log/nginx/error.log, but a custom prefix or source build can differ.
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Check configuration overrides
Inspect nginx.conf and included files for error_log directives in the main, http, server or location contexts. A lower-level directive can override an inherited value for one site or URL. The destination may be a file, stderr or a syslog: address.
sudo nginx -T 2>/dev/null | grep -nE '^[[:space:]]*error_log'After changing NGINX configuration, validate and reload it:
sudo nginx -t
sudo systemctl reload nginxInspect the PHP-FPM service and pool
Find the service name installed on your system, then inspect its journal and pool files. Names vary by PHP version, for example php8.2-fpm or php-fpm.
systemctl list-units --type=service | grep -i fpm
sudo journalctl -u php8.2-fpm --since '15 minutes ago'
ps -ef | grep '[p]hp-fpm'In the pool configuration, look for directives such as php_admin_value[error_log], php_admin_flag[log_errors], catch_workers_output, slowlog and request_slowlog_timeout. A worker log or slow log is not automatically the same as the PHP application error log. Check the pool included by the running master process, then restart or reload FPM after edits according to your distribution’s service policy.
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Syslog, journald and container standard error
When PHP uses syslog
With error_log = syslog, PHP sends messages to the system logger. On a systemd host, query the relevant service rather than searching only for a file:
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sudo journalctl -u php8.2-fpm
sudo journalctl -u apache2
sudo journalctl -u httpd
sudo journalctl -fUse the unit that owns the SAPI handling the request. If a traditional syslog daemon is in use, inspect its facility and routing configuration to determine whether messages are written to a file, forwarded to another host or filtered.
When the destination is stderr
CLI errors are normally visible in the terminal’s standard error stream. In a service, systemd captures that stream in the unit journal unless the unit redirects it elsewhere. Container images frequently send NGINX or PHP-FPM output to stderr; use the runtime’s log command instead of looking for a host path, for example:
docker logs --follow <container-name>The container name and runtime command are environment-specific. Kubernetes workloads similarly expose container streams through the pod-log mechanism, while a host-mounted file may not exist at all.
Why PHP errors are not appearing
1. You checked the wrong SAPI
Compare the failing request with the configuration you inspected. A cron job may use CLI PHP while the website uses FPM; multiple PHP versions can also have separate configuration directories. Record the binary and loaded file for each context rather than assuming one global setting.
2. Logging is disabled
Check that log_errors is enabled in the effective web configuration. The display_errors directive controls screen output, not whether errors are logged. PHP describes display-on-screen behavior as a development feature and advises against exposing it on Internet-facing production systems; keep display disabled in production and rely on logs.
3. The file cannot be opened
The web-server or FPM worker account needs write permission on the file and execute (traverse) permission on every parent directory. Check both ownership and mode:
namei -l /path/to/php-error.log
sudo -u www-data test -w /path/to/php-error.log && echo writableReplace www-data with the account shown by your Apache or FPM service. If the file does not exist, the account must be able to create it in the parent directory. Mandatory access controls such as SELinux or AppArmor can still deny access after Unix permissions look correct; inspect their audit or service logs when permission errors persist.
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Logrotate or another collector may rename the current file, compress older copies, recreate it with different ownership or truncate it while you are watching. Inspect rotation rules, timestamps and inode changes. After a rotation policy change, reload the service if required so it reopens the destination cleanly.
5. The request never reached PHP
A DNS, TLS, NGINX, Apache, routing or permission failure can stop execution before PHP starts. First check the web-server access and error logs, then confirm the request reaches the intended FPM socket or Apache handler. A PHP log cannot contain an error from code that was never invoked.
Testing a destination safely
For a controlled test, create a temporary script in a protected location that deliberately emits a benign warning, request it through the same SAPI as the failing application, and remove it immediately. You can also call PHP’s error_log() function from an administrative test script. Message type 0 uses the configured operating-system logger or file; message type 3 appends directly to the destination file. Do not use a production test to print secrets, credentials or customer data.
After the test, correlate the exact timestamp across the PHP, FPM, Apache, NGINX and system logs. This distinguishes a configuration problem from an application path that is not being executed.
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Production settings and operational safeguards
- Enable
log_errorsfor the production SAPI and keepdisplay_errorsdisabled so stack traces and filesystem paths are not sent to visitors. - Choose a destination with defined retention, rotation and access controls. Error logs can contain request parameters, usernames, paths and exception details.
- Grant the service account only the write access it needs; avoid making an entire log directory world-writable.
- Monitor disk usage. A full filesystem can silently prevent new entries even when permissions are correct.
- When using syslog or journald, configure retention and forwarding deliberately so messages are not lost during restarts or container replacement.
- Document which PHP version, SAPI, pool, virtual host and service unit own each destination. This prevents a future administrator from debugging a CLI file while the site runs through another PHP installation.
A repeatable decision path
- Identify whether the failing code runs under CLI, Apache, CGI or PHP-FPM.
- Inspect that SAPI’s loaded configuration and included files.
- Read the effective
log_errorsanderror_logvalues. - If a file path is set, resolve it and verify service-account permissions, parent-directory traversal and rotation rules.
- If the value is
syslog, query journald or the configured syslog collector. - If it is empty, inspect the SAPI logger: Apache’s
ErrorLog, the CLI terminal, the FPM service journal or the container’s standard-error stream. - Reproduce one controlled error and correlate timestamps across the relevant logs.
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