看看下面的代码，我们什么时候才能进入else块？
<?php
try {
if ($mail->send()) {
echo 'success';
} else {
echo 'failed to send';
echo $mail->ErrorInfo;
}
} catch (Exception $e) {
echo 'Exception!';
echo $mail->ErrorInfo;
}
?>
根据我的测试，电子邮件设置的配置出现任何问题（例如主机或端口错误，试图从foo@example.com发送），都会导致异常。
因此，我想知道是否有任何理由测试$mail->send()。还是可以假设如果没有异常发生，$mail->send()将返回true？
答案 0 :(得分：3)
来自source：
/**
* Create a message and send it.
* Uses the sending method specified by $Mailer.
*
* @throws Exception
*
* @return bool false on error - See the ErrorInfo property for details of the error
*/
public function send()
{
try {
if (!$this->preSend()) {
return false;
}
return $this->postSend();
} catch (Exception $exc) {
$this->mailHeader = '';
$this->setError($exc->getMessage());
if ($this->exceptions) {
throw $exc;
}
return false;
}
}
和preSend()方法：
/**
* Prepare a message for sending.
*
* @throws Exception
*
* @return bool
*/
public function preSend()
{
if ('smtp' == $this->Mailer or
('mail' == $this->Mailer and stripos(PHP_OS, 'WIN') === 0)
) {
//SMTP mandates RFC-compliant line endings
//and it's also used with mail() on Windows
static::setLE("\r\n");
} else {
//Maintain backward compatibility with legacy Linux command line mailers
static::setLE(PHP_EOL);
}
//Check for buggy PHP versions that add a header with an incorrect line break
if (ini_get('mail.add_x_header') == 1
and 'mail' == $this->Mailer
and stripos(PHP_OS, 'WIN') === 0
and ((version_compare(PHP_VERSION, '7.0.0', '>=')
and version_compare(PHP_VERSION, '7.0.17', '<'))
or (version_compare(PHP_VERSION, '7.1.0', '>=')
and version_compare(PHP_VERSION, '7.1.3', '<')))
) {
trigger_error(
'Your version of PHP is affected by a bug that may result in corrupted messages.' .
' To fix it, switch to sending using SMTP, disable the mail.add_x_header option in' .
' your php.ini, switch to MacOS or Linux, or upgrade your PHP to version 7.0.17+ or 7.1.3+.',
E_USER_WARNING
);
}
try {
$this->error_count = 0; // Reset errors
$this->mailHeader = '';
// Dequeue recipient and Reply-To addresses with IDN
foreach (array_merge($this->RecipientsQueue, $this->ReplyToQueue) as $params) {
$params[1] = $this->punyencodeAddress($params[1]);
call_user_func_array([$this, 'addAnAddress'], $params);
}
if (count($this->to) + count($this->cc) + count($this->bcc) < 1) {
throw new Exception($this->lang('provide_address'), self::STOP_CRITICAL);
}
// Validate From, Sender, and ConfirmReadingTo addresses
foreach (['From', 'Sender', 'ConfirmReadingTo'] as $address_kind) {
$this->$address_kind = trim($this->$address_kind);
if (empty($this->$address_kind)) {
continue;
}
$this->$address_kind = $this->punyencodeAddress($this->$address_kind);
if (!static::validateAddress($this->$address_kind)) {
$error_message = sprintf('%s (%s): %s',
$this->lang('invalid_address'),
$address_kind,
$this->$address_kind);
$this->setError($error_message);
$this->edebug($error_message);
if ($this->exceptions) {
throw new Exception($error_message);
}
return false;
}
}
// Set whether the message is multipart/alternative
if ($this->alternativeExists()) {
$this->ContentType = static::CONTENT_TYPE_MULTIPART_ALTERNATIVE;
}
$this->setMessageType();
// Refuse to send an empty message unless we are specifically allowing it
if (!$this->AllowEmpty and empty($this->Body)) {
throw new Exception($this->lang('empty_message'), self::STOP_CRITICAL);
}
//Trim subject consistently
$this->Subject = trim($this->Subject);
// Create body before headers in case body makes changes to headers (e.g. altering transfer encoding)
$this->MIMEHeader = '';
$this->MIMEBody = $this->createBody();
// createBody may have added some headers, so retain them
$tempheaders = $this->MIMEHeader;
$this->MIMEHeader = $this->createHeader();
$this->MIMEHeader .= $tempheaders;
// To capture the complete message when using mail(), create
// an extra header list which createHeader() doesn't fold in
if ('mail' == $this->Mailer) {
if (count($this->to) > 0) {
$this->mailHeader .= $this->addrAppend('To', $this->to);
} else {
$this->mailHeader .= $this->headerLine('To', 'undisclosed-recipients:;');
}
$this->mailHeader .= $this->headerLine(
'Subject',
$this->encodeHeader($this->secureHeader($this->Subject))
);
}
// Sign with DKIM if enabled
if (!empty($this->DKIM_domain)
and !empty($this->DKIM_selector)
and (!empty($this->DKIM_private_string)
or (!empty($this->DKIM_private)
and static::isPermittedPath($this->DKIM_private)
and file_exists($this->DKIM_private)
)
)
) {
$header_dkim = $this->DKIM_Add(
$this->MIMEHeader . $this->mailHeader,
$this->encodeHeader($this->secureHeader($this->Subject)),
$this->MIMEBody
);
$this->MIMEHeader = rtrim($this->MIMEHeader, "\r\n ") . static::$LE .
static::normalizeBreaks($header_dkim) . static::$LE;
}
return true;
} catch (Exception $exc) {
$this->setError($exc->getMessage());
if ($this->exceptions) {
throw $exc;
}
return false;
}
}
简而言之：如果发生异常，它将返回false。
答案 1 :(得分：0)
测试$mail->send()始终是一个好习惯。
要回答您的问题：
您是正确的。如果没有例外，那么它将始终返回true。
一些其他信息：
如果要在将电子邮件发送给收件人之前先对其进行测试，则可以执行以下操作：
您可以将php ini中的sendmail_path设置为所需的值。例如，它可以是tee -a mail.log，以便所有内容都记录到文件中。