OpenAI Functions

index.php

$response = $client->chat()->create([
    'model' => 'gpt-3.5-turbo-16k-0613',
    'messages' => $messages,
    'functions' => [
        [
            'name' => 'search_job_post',
            'description' => 'Search for a job based on a search query.',
            'parameters' => [
                'type' => 'object',
                'properties' => [
                    'query' => [
                        'type' => 'string',
                        'description' => 'The search string, e.g. Software engineer in london',
                    ],
                ],
                'required' => ['query'],
            ],
        ]
    ]
]);

if(isset($response->choices[0]->message->functionCall)){

    $functionCall = $response->choices[0]->message->functionCall;
    
    $function = $functionCall->name;
    $args = json_decode($functionCall->arguments);

    switch($function){
        case 'search_job_post':
            $query = $args->query;

            $job = queryAdzuna($query, $conn);

            if($job == 'no_response'){
                $messages[] = ['role' => 'assistant', 'content' => 'Unfortunately I could not find a job under "' . $query .'"'];    
                echo json_encode(['message' => 'Unfortunately I could not find a job under "' . $query .'"']);
                exit;    
            }
            
            $messages[] = ['role' => 'assistant', 'content' => null, 'function_call' => $functionCall];
            $messages[] = ['role' => 'function', 'name' => 'search_job_post', 'content' => json_encode($job)];
            
            $response2 = $client->chat()->create([
                'model' => 'gpt-3.5-turbo-16k-0613',
                'messages' => $messages,
                'functions' => [
                    [
                        'name' => 'search_job_post',
                        'description' => 'Search for a job based on a search query.',
                        'parameters' => [
                            'type' => 'object',
                            'properties' => [
                                'query' => [
                                    'type' => 'string',
                                    'description' => 'The search string, e.g. Software engineer in london',
                                ],
                            ],
                            'required' => ['query'],
                        ],
                    ]
                ]
            ]);
            

            $aiResponse = $response2->choices[0]->message->content;
            echo json_encode(['job' => json_encode($job), 'function_call' => 'search_job_post', 'message' => $aiResponse, 'chatHistory' => $chatHistory]);
            break;
    }
}else{

    $aiResponse = $response->choices[0]->message->content;

    $messages[] = ['role' => 'assistant', 'content' => $aiResponse];

    echo json_encode(['message' => $aiResponse, 'chatHistory' => $chatHistory]);
}