您应该引用您的字符串,它可以正常工作,请参见此处。
$jsonString = '["m@gmail.com","b@gmail.com","c@gmail.com"]';$arrayOfEmails=json_depre($jsonString);
要么
$jsonString = "["a@gmail.com","b@gmail.com","c@gmail.com"]";$arrayOfEmails=json_depre($jsonString);

您应该引用您的字符串,它可以正常工作,请参见此处。
$jsonString = '["m@gmail.com","b@gmail.com","c@gmail.com"]';$arrayOfEmails=json_depre($jsonString);
要么
$jsonString = "["a@gmail.com","b@gmail.com","c@gmail.com"]";$arrayOfEmails=json_depre($jsonString);