Syntax & Parse
Parser and tokenization failures.
PHP Error Library
Practical PHP error explanations with causes, diagnosis steps, and modern fixes.
Paste your PHP error
Paste a fatal, warning, SQLSTATE, or cURL message. Paths and line numbers are normalized and are not stored.
PHP errors are often more actionable than they look—if you know which fragment of the message matters. This library focuses on real diagnostic workflows: isolate the message, identify the subsystem, reproduce with the smallest input, then apply a fix that survives PHP upgrades.
Paste a full fatal/warning into the matcher, browse categories such as Composer, Xdebug, PHP-FPM, Apache, nginx, and database/SQLSTATE issues, or filter by PHP version and environment. Every guide starts near the answer—no generic “PHP is popular” filler.
Cross-link into the PHP Error Matcher, Configuration Inspector, and Composer Platform Checker when text analysis helps more than another prose page.
Browse by category
Variables & Constants
Variable scope and constant lookup.
Arrays
Array keys, offsets, and shapes.
Strings
String operations and encoding.
Functions
Function declarations and calls.
Classes & Objects
Object model and property failures.
Namespaces & Autoload
Name resolution and loading.
Type Errors
Runtime type contract violations.
Exceptions
Thrown and uncaught exceptions.
Warnings & Notices
Non-fatal runtime diagnostics.
Deprecated
Version migration deprecations.
Filesystem
File paths, permissions, and streams.
Uploads
HTTP upload handling.
Sessions & Cookies
Session persistence and cookies.
Headers & Output
HTTP output ordering.
JSON
JSON parsing and encoding.
Date & Time
Timezone and date processing.
Memory & Performance
Resource and execution limits.
Composer
Dependency and autoload tooling.
PDO
PDO drivers and statements.
MySQL & MariaDB
Database server errors.
Database Connections
Connection and authentication.
cURL & HTTP
Outbound HTTP transfers.
SSL Certificates
TLS trust and certificates.
PHP Extensions
Extension loading and availability.
PHP-FPM
FastCGI process management.
Apache
Apache PHP integration.
nginx
nginx FastCGI integration.
Xdebug
Xdebug diagnostics.
OPcache
Bytecode cache configuration.
CLI
Command-line PHP.
Cron
Scheduled PHP tasks.
WordPress PHP
WordPress runtime integration.
Laravel PHP
Laravel container and runtime.
Symfony PHP
Symfony services and runtime.
Zend & Laminas
Zend Studio and Laminas runtime.
Legacy PHP
Removed and historical behavior.
PHP Version Compatibility
Cross-version migration failures.
php.ini
PHP configuration directives.
Filter the library
162 matching guides
| Title | Pattern | Severity |
|---|---|---|
| display_errors change does not show startup errors | display_errors => Off => Off |
warning |
| Division by zero | Fatal error: Uncaught DivisionByZeroError: Division by zero in %s on line %d |
fatal |
| Failed to open stream no such file | Warning: require(%s): Failed to open stream: No such file or directory |
warning |
| Failed to open stream permission denied | Warning: file_put_contents(%s): Failed to open stream: Permission denied |
warning |
| File was only partially uploaded | The uploaded file was only partially uploaded |
warning |
| Function disabled by disable_functions | Fatal error: Uncaught Error: Call to undefined function %s() |
fatal |
| Implicit conversion loses precision | Deprecated: Implicit conversion from float 8.5 to int loses precision in %s on line %d |
notice |
| Interface not found | Fatal error: Uncaught Error: Interface "App\\Contracts\\Exporter" not found in %s on line %d |
fatal |
| It is not safe to rely on system timezone | Warning: date(): It is not safe to rely on the system's timezone settings |
warning |
| JSON malformed UTF-8 | JsonException: Malformed UTF-8 characters, possibly incorrectly encoded |
error |
| JSON maximum stack depth exceeded | JsonException: Maximum stack depth exceeded |
error |
| JSON recursion detected | JsonException: Recursion detected |
error |
| JSON syntax error | JsonException: Syntax error |
error |
| Laminas module could not be initialized | Laminas\\ModuleManager\\Exception\\RuntimeException: Module (App) could not be initialized. |
fatal |
| Laravel facade root has not been set | RuntimeException: A facade root has not been set. |
fatal |
| Laravel target class does not exist | Illuminate\\Contracts\\Container\\BindingResolutionException: Target class [App\\Services\\Report] does not exist. |
fatal |
| Lost connection to MySQL server during query | SQLSTATE[HY000]: General error: 2013 Lost connection to MySQL server during query |
error |
| max_input_vars truncates form data | Warning: Unknown: Input variables exceeded %d |
warning |
| Maximum execution time exceeded | Fatal error: Maximum execution time of %d seconds exceeded in %s on line %d |
fatal |
| Modulo by zero | Fatal error: Uncaught DivisionByZeroError: Modulo by zero in %s on line %d |
fatal |
| MySQL commands out of sync | SQLSTATE[HY000]: General error: 2014 Cannot execute queries while other unbuffered queries are active |
error |
| MySQL server has gone away | SQLSTATE[HY000]: General error: 2006 MySQL server has gone away |
error |
| New PHP syntax used on an older runtime | Parse error: syntax error, unexpected token "%s" in %s on line %d |
fatal |
| nginx connect failed connection refused | connect() failed (111: Connection refused) while connecting to upstream |
error |
| nginx No input file specified | No input file specified. |
error |
| nginx upstream sent too big header | upstream sent too big header while reading response header from upstream |
error |
| nginx upstream timed out | upstream timed out (110: Connection timed out) while reading response header from upstream |
error |
| Object could not be converted to string | Fatal error: Uncaught Error: Object of class App\\Value\\Money could not be converted to string in %s on line %d |
fatal |
| OPcache file cache permission denied | Fatal Error Unable to open base address file |
fatal |
| OPcache insufficient shared memory | Zend OPcache can't be temporary enabled (it may be only disabled till the end of request) |
warning |
| OPcache serves stale PHP files after deployment | OPcache cached script timestamp is older than deployed file: %s |
warning |
| open_basedir restriction in effect | Warning: file_exists(): open_basedir restriction in effect. File(/etc/passwd) is not within the allowed path(s) |
warning |
| Optional parameter before required parameter | Deprecated: Optional parameter $format declared before required parameter $value is implicitly treated as a required parameter in %s on line %d |
notice |
| Output buffering does not fix header ordering | Warning: Cannot modify header information - headers already sent by (output started at %s:%d) |
warning |
| Parse error: syntax error, unexpected token | Parse error: syntax error, unexpected token "%s" in %s on line %d |
parse |
| Parse error: unexpected end of file | Parse error: syntax error, unexpected end of file in %s on line %d |
parse |
| Passing null to non-nullable internal parameter is deprecated | Deprecated: strlen(): Passing null to parameter #1 ($string) of type string is deprecated in %s on line %d |
notice |
| PDO could not find driver | PDOException: could not find driver |
fatal |
| PHP @ error suppression hides the root cause | @%s suppresses a PHP diagnostic |
warning |
| PHP CLI argc or argv is missing | Warning: Undefined variable $argv |
warning |
| PHP CLI loads a different php.ini | Loaded Configuration File => %s |
warning |
| php command not found | %s: php: command not found |
error |
| PHP error_reporting hides warnings | error_reporting() returns %d but expected E_ALL |
warning |
| PHP process cannot allocate memory | mmap() failed: Cannot allocate memory |
fatal |
| PHP reports no loaded php.ini | Loaded Configuration File => (none) |
warning |
| PHP shebang bad interpreter | %s: %s: bad interpreter: No such file or directory |
error |
| PHP Startup unable to load dynamic library | PHP Warning: PHP Startup: Unable to load dynamic library 'redis' |
warning |
| PHP warning not handled correctly | Warning: %s in %s on line %d |
warning |
| PHP-FPM address already in use | ERROR: unable to bind listening socket for address '%s:9000': Address already in use |
error |
| PHP-FPM pool seems busy | WARNING: [pool www] seems busy (you may need to increase pm.start_servers, or pm.min/max_spare_servers) |
warning |
Popular / recently updated
- Call to undefined function each
- Call to undefined function mysql_connect
- Class not found
- Creation of dynamic property is deprecated
- Passing null to non-nullable internal parameter is deprecated
- Class not found after Composer install
- post_max_size exceeded and POST is empty
- Undefined array key
- Xdebug could not connect to debugging client
- Xdebug Docker client host unreachable
- Xdebug legacy port 9000 mismatch
- 502 Bad Gateway from PHP-FPM
Troubleshooting tools
- Composer Platform Checker Paste composer.json to list PHP constraints and ext-* platform requirements without runni…
- JSON Formatter Validate, pretty-print, and minify JSON in the browser without sending payloads to a serv…
- PHP Configuration Inspector Paste php --ini output or selected directive lines to identify loaded ini files and key l…
- PHP Error Matcher Paste a full PHP error, warning, SQLSTATE, or cURL message to find the best ZendStudio.ne…
FAQ
How should I search for a PHP error?
Paste the distinctive message fragment or the full fatal/warning line. Dynamic paths and line numbers are normalized automatically.
Are these pages replacements for the PHP manual?
No. They are practical troubleshooting guides that complement php.net, Composer, Xdebug, and server documentation.