This tool will assist you in taking older underscore/prefix spaced code and will namespace it as best as it can, and also make the files and class names ZF/PEAR compatible.
This two step command will first scan files and produce a map. You can then view or edit the file before moving onto the second step. The second step does the actual transformation. These transformations will be done in place, so it is best to either do this in a separate copy of the code, or on top of a git repository where you can easily reset --hard if you need to.
Download: https://github.com/zendframework/Namespacer/blob/master/namespacer.phar?raw=true
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First, create a map file:
namespacer.phar map --mapfile types.php --source path/to/src -
Second, if you want to maintain legacy classes extending your new ones:
namespacer.phar legacy --mapfile types.php --target path/for/legacy/files -
Thirdly, transform the types located in the map file:
namespacer.phar transform --mapfile types.php -
Last, fix any used namespaces
namespacer.phar fix --mapfile types.php --target path/to/src