<?php

class Sendgrid {

    public $reply = '', $replyEmail = '', $from = '', $fromEmail = '', $cc = '', $bcc = '';

    public function send($to = null, $subject = null, $body = null, $attachmentFiles = null)
    {
        if (is_null($to) OR is_null($subject) OR is_null($body)) {
            return false;
        }

        $emails = explode(',', $to);
        foreach ($emails as $email) {
            $headers = array(
                'Authorization: Bearer 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',
                'Content-Type: application/json'
            );
    
            $data = array(
                'personalizations' => array(
                    array(
                        'to' => array(
                            array(
                                'email' => trim($email),
                            )
                        )
                    )
                ),
                'from' => array(
                    'email' => $this->fromEmail,
                    'name'  => $this->from,
                ),
                'reply_to' => array(
                    'email' => $this->replyEmail,
                    'name'  => $this->reply,
                ),
                'subject' => $subject,
                'content' => array(
                    array(
                        'type' => 'text/html',
                        'value' => $body
                    )
                )
            );
            if ($this->cc) {
                foreach (explode(',', $this->cc) as $k => $cc) {
                    $ccs[$k]['email']  = trim($cc);
                }
                $data['personalizations'][0]['cc'] = $ccs;
            }
            if ($this->bcc) {
                foreach (explode(',', $this->bcc) as $k => $bcc) {
                    $bccs[$k]['email']  = trim($bcc);
                }
                $data['personalizations'][0]['bcc'] = $bccs;
            }
    
            if (isset($attachmentFiles) && is_array($attachmentFiles) && count($attachmentFiles) > 0) {
                foreach ($attachmentFiles as $k => $attachment) {
                    $attachments[$k]['content']  = base64_encode(file_get_contents($attachment));
                    $attachments[$k]['type']     = 'text/html';
                    $attachments[$k]['filename'] = basename($attachment);
                }
                $data['attachments'] = $attachments;
            }
    
            $ch = curl_init();
            curl_setopt($ch, CURLOPT_URL, 'https://api.sendgrid.com/v3/mail/send');
            curl_setopt($ch, CURLOPT_POST, 1);
            curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($data));
            curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
            curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
            curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
            curl_exec($ch);
            curl_close($ch);
        }
    }
}
?>