如何从右到左爆炸弦？

$split_point = ' - ';
$string = 'this is my - string - and more';

How can i make a split using the second instance of $split_point and not the first one. Can I specify somehow a right to left search? Best simple approach?

如何使用$ split_point的第二个实例而不是第一个实例进行拆分。我能以某种方式指定从右到左的搜索吗？最简单的方法？

Basically how do I explode from Right to Left. I want to pick up the last instance of " - ".

基本上我如何从右到左爆炸。我想拿起“ - ”的最后一个例子。

Result I need:

结果我需要：

$item[0]='this is my - string'; $item[1]='and more';

and not:

并不是：

$item[0]='this is my'; $item[1]='string - and more';

10 个解决方案

#1

You may use strrev to reverse the string, and then reverse the results back:

您可以使用strrev来反转字符串，然后反转结果：

$split_point = ' - ';
$string = 'this is my - string - and more';

$result = array_map('strrev', explode($split_point, strrev($string)));

Not sure if this is the best solution though.

不确定这是否是最好的解决方案。

#2

How about this:

这个怎么样：

$parts = explode($split_point, $string);
$last = array_pop($parts);
$item = array(implode($split_point, $parts), $last);

Not going to win any golf awards, but it shows intent and works well, I think.

我认为，不会赢得任何高尔夫奖项，但它显示出意图并且运作良好。

#3

Here is another way of doing it:

这是另一种方法：

$split_point = ' - ';
$string = 'this is my - string - and more';

$stringpos = strrpos($string, $split_point, -1);
$finalstr = substr($string,0,$stringpos);

#4

If I understand correctly, you want the example case to give you ('this is my - string', 'and more')?

如果我理解正确，你想要示例案例给你（'这是我的 - 字符串'，'和更多'）？

Built-in split/explode seems to be forwards-only - you'll probably have to implement it yourself with strrpos. (right-left search)

内置拆分/爆炸似乎只是前进 - 您可能必须自己使用strrpos实现它。 （左右搜索）

$idx = strrpos($string, $split_point);
$parts = array(substr($string, 0, $idx), substr($string, $idx+strlen($split_point)))

#5

Why not split on ' - ', but then join the first two array entries that you get back together?

为什么不拆分' - '，然后加入你重新组合的前两个数组条目？

#6

I've stumbled uppon the same, and fixed it like so:

我偶然发现了这个问题，并修复了它：

$split_point = ' - ';
$string = 'this is my - string - and more';

$reverse_explode = array_reverse(explode($split_point, $string));

#7

I liked Moff's answer, but I improved it by limiting the number of elements to 2 and re-reversing the array:

我喜欢Moff的答案，但我通过将元素数量限制为2并重新反转数组来改进它：

$split_point = ' - ';
$string = 'this is my - string - and more';

$result = array_reverse(array_map('strrev', explode($split_point, strrev($string),2)));

Then $result will be :

那么$ result将是：

Array ( [0] => this is my - string [1] => and more )

#8

this is my - string - and more

这是我的 - 字符串 - 还有更多

1. Use common explode function to get all strings
2. 使用常见的爆炸函数来获取所有字符串
3. Get sizeof array and fetch last item
4. 获取sizeof数组并获取最后一项
5. Pop last item using array_pop function.
6. 使用array_pop函数弹出最后一项。
7. Implode remaining string with same delimeter(if u want other delimeter can use).
8. 使用相同的分隔符内爆剩余字符串（如果你想要其他分隔符可以使用）。

Code

码

$arrSpits=explode("", "this is my - string - and more");
$arrSize=count($arrSpits);

echo "Last string".$arrSpits[arrSize-1];//Output: and more


array_pop(arrSpits); //now pop the last element from array

$firstString=implode("-", arrSpits);
echo "First String".firstString; //Output: this is my - string

#9

Assuming you only want the first occurrence of $split_point to be ignored, this should work for you:

假设您只想忽略第一次出现的$ split_point，这应该对您有用：

# retrieve first $split_point position
$first = strpos($string, $split_point);
# retrieve second $split_point positon
$second = strpos($string, $split_point, $first+strlen($split_point));
# extract from the second $split_point onwards (with $split_point)
$substr = substr($string, $second);

# explode $substr, first element should be empty
$array = explode($split_point, $substr);

# set first element as beginning of string to the second $split_point
$array[0] = substr_replace($string, '', strpos($string, $substr));

This will allow you to split on every occurrence of $split_point after (and including) the second occurrence of $split_point.

这将允许您在第二次出现$ split_point之后（包括）拆分$ split_point的每次出现。

#10

$split_point = ' - ';
$string = 'this is my - string - and more';
$result = end(explode($split_point, $string));

This is working fine

这工作正常