modify this python code to check for "is also an antonym"

import json
import os
import re

def check_phrase_in_explanation(input_path, phrase="sounds similar", verbose=True, case_sensitive=False, save_missing_ids=False, output_path="missing_ids.txt"):
    """
    Checks each entry in the JSON file to see if the 'explanation' field contains a specific phrase.
    Prints the 'id' of entries where the phrase is not found.

    Args:
        input_path (str): Path to the input JSON file (e.g., 'synonymtemp1.json').
        phrase (str): The phrase to search for in the 'explanation' field.
        verbose (bool): If True, prints detailed warnings and information.
        case_sensitive (bool): If True, the search is case-sensitive.
        save_missing_ids (bool): If True, saves the missing ids to a text file.
        output_path (str): Path to save the missing ids if `save_missing_ids` is True.
    """
    # Check if the input file exists
    if not os.path.exists(input_path):
        print(f"Error: The file '{input_path}' does not exist.")
        return

    # Load the JSON data
    try:
        with open(input_path, 'r', encoding='utf-8') as file:
            data = json.load(file)
    except json.JSONDecodeError as e:
        print(f"Error decoding JSON from '{input_path}': {e}")
        return

    # Ensure the JSON data is a list
    if not isinstance(data, list):
        print(f"Error: Expected the JSON data to be a list of entries in '{input_path}'.")
        return

    # List to store ids missing the phrase
    missing_ids = []

    # Compile the search pattern
    flags = 0
    if not case_sensitive:
        flags = re.IGNORECASE
    # Escape the phrase to handle any special regex characters
    pattern = re.compile(re.escape(phrase), flags)

    # Iterate through each entry
    for entry in data:
        entry_id = entry.get('id', 'Unknown ID')
        explanation = entry.get('explanation', '')

        if not explanation:
            if verbose:
                print(f"Warning: Entry with id '{entry_id}' has an empty 'explanation' field.")
            missing_ids.append(entry_id)
            continue

        # Search for the phrase in the explanation
        if not pattern.search(explanation):
            if verbose:
                print(f"Entry with id '{entry_id}' is missing the phrase '{phrase}'.")
            missing_ids.append(entry_id)

    # Print the results
    if missing_ids:
        print("\nEntries missing the phrase '{}':".format(phrase))
        for eid in missing_ids:
            print(eid)
    else:
        print(f"All entries contain the phrase '{phrase}' in their explanations.")

    # Optionally, save the missing ids to a file
    if save_missing_ids:
        try:
            with open(output_path, 'w', encoding='utf-8') as out_file:
                for eid in missing_ids:
                    out_file.write(f"{eid}\n")
            print(f"\nMissing ids have been saved to '{output_path}'.")
        except IOError as e:
            print(f"Error writing to '{output_path}': {e}")

# Example usage
if __name__ == "__main__":
    # Define the path to your JSON file
    input_file = r'D:\DBImportExport\AllJsonFiles\synonymtemp1.json'

    # Call the function with desired parameters
    check_phrase_in_explanation(
        input_path=input_file,
        phrase="sounds similar",
        verbose=True,
        case_sensitive=False,      # Set to True if the search should be case-sensitive
        save_missing_ids=True,    # Set to True to save the missing ids to a file
        output_path="missing_ids.txt"  # File to save missing ids
    )