Symfony Polyfill

https://github.com/symfony/polyfill

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Symfony Polyfill backports features found in newer PHP versions and provides compatibility layers...

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License:MIT

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### Configure composer.json replace section

Source: https://github.com/symfony/polyfill/blob/1.x/README.md

Use the replace section to inform Composer that specific polyfills are not needed because the project meets the required PHP version or extension requirements.

```json
{
    "replace": {
        "symfony/polyfill-php54": "*",
        "symfony/polyfill-php55": "*",
        "symfony/polyfill-php56": "*",
        "symfony/polyfill-php70": "*",
        "symfony/polyfill-mbstring": "*"
    }
}
```

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