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PHP Manual :: What has changed in PHP 5.3.x



Migrating from PHP 5.2.x to PHP 5.3.x || Backward Incompatible Changes || PHP Manual

Most improvements in PHP 5.3.x have no impact on existing code. There are a few incompatibilities and new features that should be considered, and code should be tested before switching PHP versions in production environments.

For systems being upgraded from an older version of PHP, the relevant documentation is available at:



Migrating from PHP 5.2.x to PHP 5.3.x || Backward Incompatible Changes || PHP Manual
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