I assume you are talking about indents (leading spaces). If so:
For this you need to open such file and select text you want to process.
Alternatively: you can process a bunch of files at once via "Code | Reformat Code..."
(will be done accordingly to your Code Style).. but that will do actual full reformat, which may not be desirable in some cases (e.g. limited formatting rules; or rules do not fork as you need (limited options; edge cases); or whatever).
출처 : https://stackoverflow.com/questions/19966734/convert-tabs-to-spaces-phpstorm
참조:
https://www.jetbrains.com/help/phpstorm/changing-indentation.html
https://www.jetbrains.com/help/phpstorm/common-code-style-options-tabs-and-indents.html