我正在尝试根据 Message= 和 Author 上的文本拆分创建一个文本数组。但是它返回一个空值作为第一个数组项。我不明白为什么会这样。所以我决定来这里寻求一些建议。

$text = "Message=Great school. Great teaching team. School does an amazing job at supporting ALL my child’s needs. They have always gone the extra mile for him. So thank you all. You do a great job! Author=Parent

Message=Fabulous school with a friendly atmosphere. Staff and the Headteacher are approachable. I cannot praise the school highly enough. Author=Parent

Message=For the past 9 years, through 2 children, I have always felt NPS goes the extra mile to support it's students in all areas of the curriculum. The staff are fantastic, hard-working and very approachable. It is a great school and I am glad we chose it all those years ago. Author=Parent

Message=This school has always been a positive influence on my children (2 of which didn't want to leave!) I have recommended this school to several people in the past and will continue to do so in the future. High praise for all the teachers and assistants who make the school what it is! Author=Parent

Message=Great team of staff at NPS. Ladies at reception are so helpful. Newsletter and Facebook page are very informative and helpful. Breakfast club - excellent - my child raves about it. Love the Friday celebration assembly. The sense of pride and encouragement felt is overwhelming - a wonderful celebration of the children. Author=Parent

Message=Thanks for the beautiful memories, good times and great learning experiences for Adam, Faith and Rose! Truly has been a life time adventure for the kids...one that will last a lifetime of memories! Hope to visit Neston again in the future! Parent=A parent, after family returned home overseas

Message=We would like to thank all the teachers who made the Delamere trip possible, Kieran had an amazing time and is already asking when he can go again Author=Parent, following Year 2 residential visit";

$tempArray = explode("Message=", $text);
echo "<pre>";
foreach($tempArray as $value){
   print_r(explode("Author=", $value));
}
echo "</pre>";

结果:

Array
(
    [0] => 
)
Array
(
    [0] => Great school. Great teaching team. School does an amazing job at supporting ALL my child’s needs. They have always gone the extra mile for him. So thank you all. You do a great job! 
    [1] => Parent


)
Array
(
    [0] => Fabulous school with a friendly atmosphere. Staff and the Headteacher are approachable. I cannot praise the school highly enough. 
    [1] => Parent


)
Array
(
    [0] => For the past 9 years, through 2 children, I have always felt NPS goes the extra mile to support it's students in all areas of the curriculum. The staff are fantastic, hard-working and very approachable. It is a great school and I am glad we chose it all those years ago. 
    [1] => Parent


)
Array
(
    [0] => This school has always been a positive influence on my children (2 of which didn't want to leave!) I have recommended this school to several people in the past and will continue to do so in the future. High praise for all the teachers and assistants who make the school what it is! 
    [1] => Parent


)
Array
(
    [0] => Great team of staff at NPS. Ladies at reception are so helpful. Newsletter and Facebook page are very informative and helpful. Breakfast club - excellent - my child raves about it. Love the Friday celebration assembly. The sense of pride and encouragement felt is overwhelming - a wonderful celebration of the children. 
    [1] => Parent


)
Array
(
    [0] => Thanks for the beautiful memories, good times and great learning experiences for Adam, Faith and Rose! Truly has been a life time adventure for the kids...one that will last a lifetime of memories! Hope to visit Neston again in the future! 
    [1] => A parent, after family returned home overseas


)
Array
(
    [0] => We would like to thank all the teachers who made the Delamere trip possible, Kieran had an amazing time and is already asking when he can go again 
    [1] => Parent, following Year 2 residential visit
)

最佳答案

让我们用一个较短的字符串来解释这一点。 $text = "Message=很棒的学校。很棒的教学团队。";

当您像这样分解该字符串时:$tempArray = explode("Message=", $text); 然后它会找到一次“Message=”。当你在一点 split 某物时，你将不得不在之后 split 。在这种情况下，第一部分是“Message=”之前的部分，第二部分是“Message=”之后的部分。但是现在因为出现在字符串的开头，所以第一部分将是一个空字符串。

如果你的 $text 是这样的:
$text = "FooBar Message=很棒的学校。很棒的教学团队。"; 那么你仍然会有 2 件，但第一件不会是空的，但会包含“Foobar”。

关于php - 数组中的空值作为第一项 (PHP)，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/47453162/