code: def test_log_expr():
      expr = ast.LogExpr(ast.NumVal(2.0))
  
      expected_code = """
  <?php
  function score(array $input) {
      return log(2.0);
  }
  """
  
      interpreter = PhpInterpreter()
      assert_code_equal(interpreter.interpret(expr), expected_code)
  
imports: from itertools import product
  import pytest
  from m2cgen import ast
  from m2cgen.interpreters import PhpInterpreter
  from tests.utils import assert_code_equal
label_desc: Use image node_id 15 for calling a global function with example usage: test_log_expr() without return types