code: def interpret(self, expr):
      self._cg.reset_state()
      self._reset_reused_expr_cache()
  
      with self._cg.function_definition(
          name=self.function_name,
          args=[(True, self._feature_array_name)],
      ):
          last_result = self._do_interpret(expr)
          self._cg.add_return_statement(last_result)
  
      current_dir = Path(__file__).absolute().parent
  
      if self.with_linear_algebra:
          filename = current_dir / "linear_algebra.php"
          self._cg.add_code_lines(get_file_content(filename))
  
      if self.with_softmax_expr:
          filename = current_dir / "softmax.php"
          self._cg.add_code_lines(get_file_content(filename))
  
      if self.with_sigmoid_expr:
          filename = current_dir / "sigmoid.php"
          self._cg.add_code_lines(get_file_content(filename))
  
      self._cg.prepend_code_line("<?php")
  
      return self._cg.finalize_and_get_generated_code()
  
file_path: m2cgen/m2cgen/interpreters/php/interpreter.py
imports: from pathlib import Path
  from m2cgen.ast import BinNumOpType
  from m2cgen.interpreters.interpreter import ImperativeToCodeInterpreter
  from m2cgen.interpreters.mixins import LinearAlgebraMixin, PowExprFunctionMixin
  from m2cgen.interpreters.php.code_generator import PhpCodeGenerator
  from m2cgen.interpreters.utils import get_file_content
label_desc: Use image node_id 2 for calling the PhpInterpreter obj's underlying member method code with example usage: obj.interpret(expr) and returns: self