PHP 8.1 UPGRADE NOTES

1. Backward Incompatible Changes
2. New Features
3. Changes in SAPI modules
4. Deprecated Functionality
5. Changed Functions
6. New Functions
7. New Classes and Interfaces
8. Removed Extensions and SAPIs
9. Other Changes to Extensions
10. New Global Constants
11. Changes to INI File Handling
12. Windows Support
13. Other Changes
14. Performance Improvements

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1. Backward Incompatible Changes
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2. New Features
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- hash:
  . Added MurmurHash3 with streaming support. The following variants are implemented

    - murmur3a, 32-bit hash
    - murmur3c, 128-bit hash for x86
    - murmur3f, 128-bit hash for x64

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3. Changes in SAPI modules
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4. Deprecated Functionality
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5. Changed Functions
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6. New Functions
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7. New Classes and Interfaces
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8. Removed Extensions and SAPIs
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9. Other Changes to Extensions
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- OpenSSL:
  . The OpenSSL extension now requires at least OpenSSL version 1.0.2.

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10. New Global Constants
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11. Changes to INI File Handling
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12. Windows Support
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. The macro IGNORE_URL_WIN has been removed; it had no effect as of PHP 5.0.0.

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13. Other Changes
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14. Performance Improvements
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