Question

我正在尝试拆分字符串，如下所示

<?php    
$str = "Q:1) What is PHP?Opensource,cms,framework,webservice,opensource
        Q:2) What is Laravel?Opensource,cms,framework,webservice,framework     
        Q:3) What is Wordpress?Opensource,cms,framework,webservice,framwork     
        Q:4) What is Shopify?Opensource,cms,framework,webservice,framwork       
        Q:5) What is Mangento?Opensource,cms,framework,webservice,framwork";    

$ex = explode("Q:",$str);    
echo $ex[0];

它什么也没显示

Answer 1

第0个索引将为空，因为Q:位于起始位置。所以从索引1开始

您的结果将是：

Array
(
    [0] => 
    [1] => 1) What is PHP?Opensource,cms,framework,webservice,opensource 
    [2] => 2) What is Laravel?Opensource,cms,framework,webservice,framework 
    [3] => 3) What is Wordpress?Opensource,cms,framework,webservice,framwork 
    [4] => 4) What is Shopify?Opensource,cms,framework,webservice,framwork 
    [5] => 5) What is Mangento?Opensource,cms,framework,webservice,framwork
)

可能的解决方法：

您可以通过应用array_shift：

来解决这个问题

array_shift($ex);

这会将元素从爆炸数组的开头移开。然后你的数组将成为：

Array
(
    [0] => 1) What is PHP?Opensource,cms,framework,webservice,opensource 
    [1] => 2) What is Laravel?Opensource,cms,framework,webservice,framework 
    [2] => 3) What is Wordpress?Opensource,cms,framework,webservice,framwork 
    [3] => 4) What is Shopify?Opensource,cms,framework,webservice,framwork 
    [4] => 5) What is Mangento?Opensource,cms,framework,webservice,framwork
)

Answer 2

那是因为第一次出现＆＃34; Q：＆＃34;在字符串的最开头，所以$ ex中的第一项是一个空字符串。尝试输出第二个项目$echo $ex[1];，它应该给你

"1) What is PHP?Opensource,cms,framework,webservice,opensource"

如何使用php

2 个答案: