Understanding Development vs Production PHP Settings

Development favors visible warnings and debuggability; production favors private logs and bounded resources.

What It Does and When to Use It

Production settings prevent diagnostics being returned to public HTTP clients. Direct PHP code exposes the underlying operation clearly; a framework can supply lifecycle hooks, dependency wiring and retries.

Requirements, Inputs and Expected Behavior

Confirm the runtime, extension, environment variables, and permissions before running the examples in production. Never ship development display_errors, debug Xdebug sessions or embedded test credentials to production.

Example 1: Basic Operation

Production settings prevent diagnostics being returned to public HTTP clients.

display_errors=Off
log_errors=On
expose_php=Off
zend.assertions=-1

Example 2: Behavior and Validation

Inspect effective SAPI settings; CLI and PHP-FPM load different INI files.

<?php
foreach (['display_errors','log_errors','error_log','memory_limit'] as $key) { echo $key, '=', var_export(ini_get($key),true), PHP_EOL; }

Practical Example: Application Use

Keep internal exception details out of the response and avoid logging credentials.

<?php
try { throw new RuntimeException('Private: DB connection failed'); }
catch (Throwable $e) {
    error_log('request_failure class='.get_class($e));
    http_response_code(500);
    echo 'An unexpected error occurred';
}

Important Behavior and Edge Cases

The second example highlights: Inspect effective SAPI settings; CLI and PHP-FPM load different INI files. The practical example adds: Keep internal exception details out of the response and avoid logging credentials.

Comparison with Related Approaches

Common Beginner Mistakes

Key Takeaways

• Development favors visible warnings and debuggability; production favors private logs and bounded resources.
• Keep internal exception details out of the response and avoid logging credentials.
• Choose based on deployment requirements and verify actual behavior rather than assuming defaults.