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<?php $summary="The problem with field2 is field13. The fix will be field7"; $_POST['field2']='thiscomputer'; $_POST['field7']='thishotfix'; $_POST['field13']='thisapplication'; echo str_replace(array_keys($_POST),array_values($_POST),$summary); ?>
Output for 7.1.26 - 7.1.33, 7.2.17 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.27, 8.4.1 - 8.4.14
The problem with thiscomputer is thisapplication. The fix will be thishotfix

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