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Check all PHP files in a directory for syntax errors

harmlessPHPalle
Adjust the values, the command updates live
user@server
find /var/www/vhosts/example.com/httpdocs/wp-content/themes -name '*.php' -exec php -l {} \; 2>&1 | grep -v '^No syntax errors'

Runs the syntax check php -l on every .php file found, without executing the code. Only files with parse errors are printed. Useful before switching PHP versions or after manual changes to theme and plugin files.

Note: For a PHP upgrade, check with the target version, for example /opt/plesk/php/8.3/bin/php -l. The syntax check does not find runtime errors such as deprecated functions.

Also searched as

  • find php syntax errors
  • search for php parse error
  • lint php files before upgrade

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Check Composer packages for known vulnerabilities

$composer audit --working-dir=/var/www/vhosts/example.com/httpdocs
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Check PHP OPcache settings

$php -i | grep -E '^opcache\.(enable|enable_cli|memory_consumption|max_accelerated_files|validate_timestamps|revalidate_freq) '
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Check the current value of a PHP setting

$php -i | grep -i memory_limit
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Check whether a PHP extension is loaded

$php -m | grep -i imagick
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Count PHP-FPM processes per pool

$ps -eo args | grep '[p]hp-fpm: pool' | awk '{print $NF}' | sort | uniq -c | sort -rn
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Install Composer dependencies for production

$composer install --no-dev --optimize-autoloader --working-dir=/var/www/vhosts/example.com/httpdocs
cautionPHP

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