========================================== Rule simple_to_complex_string_variable

Converts explicit variables in double-quoted strings and heredoc syntax from simple to complex format (${ to {$).

Description

Doesn't touch implicit variables. Works together nicely with explicit_string_variable.

Examples

Example #1

.. code-block:: diff

   --- Original
   +++ New
    <?php
    $name = 'World';
   -echo "Hello ${name}!";
   +echo "Hello {$name}!";

Example #2

.. code-block:: diff

--- Original +++ New <?php $name = 'World'; echo <<<TEST -Hello ${name}! +Hello {$name}! TEST;

Rule sets

The rule is part of the following rule sets:

• @PHP8x2Migration <./../../ruleSets/PHP8x2Migration.rst>_
• @PHP8x3Migration <./../../ruleSets/PHP8x3Migration.rst>_
• @PHP8x4Migration <./../../ruleSets/PHP8x4Migration.rst>_
• @PHP8x5Migration <./../../ruleSets/PHP8x5Migration.rst>_
• @PHP82Migration <./../../ruleSets/PHP82Migration.rst>_ (deprecated)
• @PHP83Migration <./../../ruleSets/PHP83Migration.rst>_ (deprecated)
• @PHP84Migration <./../../ruleSets/PHP84Migration.rst>_ (deprecated)
• @PHP85Migration <./../../ruleSets/PHP85Migration.rst>_ (deprecated)
• @PhpCsFixer <./../../ruleSets/PhpCsFixer.rst>_
• @Symfony <./../../ruleSets/Symfony.rst>_

References

• Fixer class: PhpCsFixer\\Fixer\\StringNotation\\SimpleToComplexStringVariableFixer <./../../../src/Fixer/StringNotation/SimpleToComplexStringVariableFixer.php>_
• Test class: PhpCsFixer\\Tests\\Fixer\\StringNotation\\SimpleToComplexStringVariableFixerTest <./../../../tests/Fixer/StringNotation/SimpleToComplexStringVariableFixerTest.php>_

The test class defines officially supported behaviour. Each test case is a part of our backward compatibility promise.