What are some common issues when upgrading PHP versions and how can they be resolved?

Issue: Deprecated functions and syntax in older PHP versions causing errors in newer PHP versions. Solution: Update deprecated functions and syntax to their modern equivalents. 

// Deprecated syntax
$old_array = array();

// Modern syntax
$new_array = [];
```

Issue: Incompatibility with third-party libraries or frameworks due to PHP version differences.

Solution: Update the third-party libraries or frameworks to versions that are compatible with the new PHP version.

```php
// Update composer.json to specify compatible versions
"require": {
    "vendor/library": "^2.0"
}
```

Issue: Changes in default PHP settings or configurations leading to unexpected behavior.

Solution: Check the PHP configuration files and adjust settings as needed to align with the new PHP version.

```php
// Adjust PHP configuration settings
ini_set('memory_limit', '256M');

Keywords

incompatible extensions deprecated functions syntax errors PHP configuration version conflicts

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