PHP error guide

nginx No input file specified: meaning and fix

error server Affects: Current PHP-FPM, Apache 2.4, or nginx Last verified:

Error summary

Use $document_root or $realpath_root consistently with the deployed root. FastCGI receives a SCRIPT_FILENAME that does not identify an accessible file.

What it means

Use $document_root or $realpath_root consistently with the deployed root. FastCGI receives a SCRIPT_FILENAME that does not identify an accessible file.

What the error means

This message means that FastCGI receives a SCRIPT_FILENAME that does not identify an accessible file. The exact signature distinguishes nginx no input file specified from a generic application failure.

Why PHP produces it

The engine or service reports “nginx No input file specified” because its required precondition was not met. Use $document_root or $realpath_root consistently with the deployed root.

PHP version notes

The nginx no input file specified wording here is based on Current PHP-FPM, Apache 2.4, or nginx; punctuation and exception class names can differ on older branches or vendor builds.

Most common causes

  • The immediate input or configuration reaches the specific condition: FastCGI receives a SCRIPT_FILENAME that does not identify an accessible file
  • The code path assumes the prerequisite for nginx no input file specified has already been satisfied.
  • For nginx no input file specified, development and production differ in version, extension, permissions, paths, or service configuration.
  • An earlier operation returned an unchecked value that is consumed by the line reporting nginx no input file specified.

Minimal examples

BAD — reproduces the problem

nginx 
fastcgi_param SCRIPT_FILENAME $document_root/app$fastcgi_script_name;

FIXED — safer pattern

nginx 
fastcgi_param SCRIPT_FILENAME $realpath_root$fastcgi_script_name;

Step-by-step diagnosis

  1. Copy the complete “No input file specified.” text and retain the first application stack frame.
  2. Reproduce nginx no input file specified in the same SAPI and environment listed for this page.
  3. Before changing nginx no input file specified, inspect the preceding value or directive and verify its type, path, version, and permissions.
  4. Apply the narrow correction—use $document_root or $realpath_root consistently with the deployed root—then repeat the original request once.

Fixes

Correct the failing prerequisite

Use $document_root or $realpath_root consistently with the deployed root

nginx 
fastcgi_param SCRIPT_FILENAME $realpath_root$fastcgi_script_name;

Fail explicitly at the boundary

Validate the condition before the operation that emits nginx no input file specified, and log a safe diagnostic without credentials or full production paths.

Common mistakes when fixing it

  • Suppressing nginx no input file specified instead of correcting its upstream condition.
  • Testing nginx no input file specified only with the CLI binary when the failing request runs under FPM or Apache.
  • Changing a global setting for nginx no input file specified before confirming the site-specific effective configuration.

How to prevent it

  • Add a focused test that exercises the boundary responsible for nginx no input file specified.
  • Keep runtime versions, extensions, configuration, and deploy artifacts affecting nginx no input file specified reproducible.
  • Validate external data and service return values before they can trigger nginx no input file specified.

Web server / environment notes

fpm, nginx, linux. The failure occurs where fastCGI receives a SCRIPT_FILENAME that does not identify an accessible file

Tags: fpm,nginx,linux

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