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# 1. Memory-limit fatals (PHP's exact message)
sudo grep -rh "Allowed memory size of" /var/log/php*-fpm.log /var/log/apache2/ /var/log/httpd/ /var/log/nginx/ 2>/dev/null | tail -50

# 2. Workers killed by signals
sudo grep -rhE "exited on signal (6|11)|exit signal (Segmentation fault|Aborted)" \
  /var/log/php*-fpm.log /var/log/apache2/ /var/log/httpd/ 2>/dev/null | tail -50
sudo journalctl --since "2026-10-01" | grep -E "php.*segfault" | tail

# 3. Clients producing many 500s on POST (combined log format)
sudo awk '$6=="\"POST" && $9==500 {print $1}' /var/log/nginx/access.log* /var/log/apache2/access.log* 2>/dev/null \
  | sort | uniq -c | sort -rn | head -20

# Temporary: log Set-Cookie on responses to spot oversized PHPSESSID values.
# This writes session IDs to disk — restrict the file and remove it afterwards.
# In the http {} block:
log_format php2shell '$remote_addr [$time_local] "$request" $status "$sent_http_set_cookie"';
# In the server {} block:
access_log /var/log/nginx/php2shell.log php2shell;

# Then, from a shell, look for long or percent-encoded session cookies
grep -E 'PHPSESSID=[^;"]{64,}|PHPSESSID=[^;"]*%' /var/log/nginx/php2shell.log

# PHP files changed in the web root since the bugs became known (adjust path/date)
sudo find /var/www -type f -name '*.php' -newermt '2026-08-01' -printf '%TY-%Tm-%Td %TH:%TM  %p\n' | sort | tail -100

# Processes the web user is running right now (shells and downloaders are red flags)
ps -u www-data -o pid,ppid,lstart,cmd | grep -vE 'php-fpm|apache2|httpd'

# Established connections owned by PHP / Apache — review every remote address
sudo ss -tpn state established | grep -E 'php|apache|httpd'