fix: cleanup php unused use statements (#320)

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# Fixes [DII-702](https://issues.corp.twilio.com/browse/DII-702)

Cleans unused "use" statements from php code files.

### Checklist
- [x] I acknowledge that all my contributions will be made under the
project's license
- [ ] Run `make test-docker`
- [ ] Verify affected language:
- [ ] Generate [twilio-go](https://github.com/twilio/twilio-go) from our
[OpenAPI specification](https://github.com/twilio/twilio-oai) using the
[build_twilio_go.py](./examples/build_twilio_go.py) using `python
examples/build_twilio_go.py path/to/twilio-oai/spec/yaml
path/to/twilio-go` and inspect the diff
    - [ ] Run `make test` in `twilio-go`
    - [ ] Create a pull request in `twilio-go`
    - [ ] Provide a link below to the pull request
- [ ] I have made a material change to the repo (functionality, testing,
spelling, grammar)
- [ ] I have read the [Contribution
Guidelines](https://github.com/twilio/twilio-oai-generator/blob/main/CONTRIBUTING.md)
and my PR follows them
- [ ] I have titled the PR appropriately
- [ ] I have updated my branch with the main branch
- [ ] I have added tests that prove my fix is effective or that my
feature works
- [ ] I have added the necessary documentation about the functionality
in the appropriate .md file
- [ ] I have added inline documentation to the code I modified

If you have questions, please create a GitHub Issue in this repository.

Co-authored-by: childish-sambino <sharrison@twilio.com>

Author: isha689

scripts/build_twilio_library.py

@@ -4,8 +4,7 @@
 from pathlib import Path
 from typing import Tuple
 
-from clean_java_imports import remove_unused_imports
-
+from clean_unused_imports import remove_unused_imports
 '''
 Subdirectories map for maintaining directory
 structures specific to language style.
@@ -15,7 +14,7 @@
     'csharp': 'Rest',
     'php': 'Rest'
 }
-
+CLEANUP_IMPORT_LANGUAGES = ['java', 'php']
 
 def build(openapi_spec_path: str, output_path: str, language: str) -> None:
     if os.path.isfile(openapi_spec_path):
@@ -33,8 +32,8 @@ def generate(openapi_spec_path: str, output_path: str, language: str, domain: st
     sub_dir = subdirectories.get(language, 'rest')
     output_path = os.path.join(output_path, sub_dir)
     run_openapi_generator(parent_dir, language, output_path, full_path)
-    if language == 'java':
-        remove_unused_imports(output_path, 'java')
+    if language in CLEANUP_IMPORT_LANGUAGES:
+        remove_unused_imports(output_path, language)
 
 
 def run_openapi_generator(parent_dir: str, language: str, output_path: str, full_path: str) -> None:

scripts/clean_java_imports.py renamed to scripts/clean_unused_imports.py

@@ -2,10 +2,15 @@
 import os
 import re
 
-IMPORT_RE = re.compile(r'^\s*import\s+[\w\.]+\.(\w+)\s*;\s*(?://.*)?$')
-
 LANGUAGE_REGEX_MAP = {
-    "java": "*.java"
+    "java": {
+        "pattern": "*.java",
+        "regex": re.compile(r'^\s*import\s+[\w\.]+\.(\w+)\s*;\s*(?://.*)?$')
+    },
+    "php": {
+        "pattern": "*.php",
+        "regex": re.compile(r'^\s*use\s+[\w\\]+\\(\w+)\s*\w*\s*(\w*);\s*(?://.*)?$')
+    }
 }
 
 
@@ -16,15 +21,19 @@ def locate(pattern, root=os.curdir):
 
 
 def remove_unused_imports(root_dir, language):
-    for filename in locate(LANGUAGE_REGEX_MAP[language], root_dir):
+    for filename in locate(LANGUAGE_REGEX_MAP[language]["pattern"], root_dir):
         import_lines = {}
         other_lines = []
         with open(filename) as f:
             all_lines = f.readlines()
         for n, line in enumerate(all_lines):
+            IMPORT_RE=LANGUAGE_REGEX_MAP[language]["regex"]
             m = IMPORT_RE.match(line)
             if m:
-                import_lines[n] = m.group(1)
+                if " as " in line:
+                    import_lines[n] = m.group(2)
+                else:
+                    import_lines[n] = m.group(1)
             else:
                 other_lines.append(line)
         other_code = ''.join(other_lines)