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check-file-io

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Audits file I/O patterns in PHP code. Detects full-file reads into memory, missing file locks, temp file cleanup issues, missing stream usage, and insecure file operations.

skills/check-file-io/SKILL.md

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# File I/O Patterns Audit

Analyze PHP code for suboptimal or dangerous file I/O patterns.

## Detection Patterns

### 1. Full File Read Into Memory

```php
// CRITICAL: Entire file loaded into memory
$content = file_get_contents('/path/to/large-file.csv'); // 500MB file → OOM!
$lines = file('/path/to/large-file.csv'); // Loads all lines into array!

// CRITICAL: Reading large file to process line by line
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