Finding Deprecated PHP APIs with Static Analysis

Combine static analysis, deprecation reports and dependency audits before runtime upgrades. The examples separate the essential operation from the conditions a production implementation must enforce.

What It Does

Combine static analysis, deprecation reports and dependency audits before runtime upgrades.

Prerequisites

Use a dedicated development environment with test accounts and records. Separate authorization, validation and error handling from response formatting; never copy demonstration-only secrets into production.

Static Analysis Commands

composer check-platform-reqs
vendor/bin/phpstan analyse src --level=8

PHPStan requires installation as a development dependency; the command is not part of core PHP.

Example 1: Core Behavior

This scenario applies the exact rule described in the guide, with controlled sample values.

<?php
$command="vendor/bin/phpstan analyse --level=8 src"; echo $command;

Example 2: Alternative or Failure Case

This scenario applies the exact rule described in the guide, with controlled sample values.

<?php
$files=["composer.json","composer.lock"]; foreach($files as $f){echo $f." ".(is_file($f)?"present":"missing").PHP_EOL;}

Practical Example: Applying the Rule

This scenario applies the exact rule described in the guide, with controlled sample values.

<?php
$phpTarget="8.4"; echo "Run static checks against PHP ".$phpTarget." and review deprecation notices";

Important Behavior and Edge Cases

Running composer audit does not detect code-level deprecated PHP functions.

Comparison with Related Functions or Patterns

Common Beginner Mistakes

Key Takeaways

• Combine static analysis, deprecation reports and dependency audits before runtime upgrades.
• Running composer audit does not detect code-level deprecated PHP functions.
• PHP version platform constraints help catch incompatible dependencies early.

Select this API or pattern based on its documented behavior and the trust boundaries in your own application, and test all external integrations against their actual deployments.