php 我怎样才能爆炸和修剪空白？
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How can I explode and trim whitespace?
提问by SeanWM
For example, I would like to create an array from the elements in this string:
例如，我想从这个字符串中的元素创建一个数组：
$str = 'red, green, blue ,orange';
I know you can explode and loop through them and trim:
我知道你可以爆炸并遍历它们并修剪：
$arr = explode(',', $str);
foreach ($arr as $value) {
$new_arr[] = trim($value);
}
But I feel like there's a one line approach that can handle this. Any ideas?
但我觉得有一种方法可以解决这个问题。有任何想法吗？
回答by SeanWM
回答by Amr ElAdawy
An Improved answer
改进的答案
preg_split ('/(\s*,*\s*)*,+(\s*,*\s*)*/', 'red, green thing ,, ,, blue ,orange');
Result:
结果：
Array
(
[0] => red
[1] => green thing
[2] => blue
[3] => orange
)
This
这个
- Splits on commas only
- Trims white spaces from each item.
- Ignores empty items
- Does not split an item with internal spaces like "green thing"
- 仅在逗号上拆分
- 从每个项目中修剪空白。
- 忽略空项目
- 不会拆分带有内部空间的项目，例如“绿色东西”
回答by Diego Perini
The following also takes care of white-spaces at start/end of the input string:
下面还处理输入字符串开头/结尾的空格：
$new_arr = preg_split('/\s*,\s*/', trim($str));
and this is a minimal test with white-spaces in every sensible position:
这是在每个合理位置都有空格的最小测试：
$str = ' first , second , third , fourth, fifth ';
$new_arr = preg_split('/\s*,\s*/', trim($str));
var_export($str);
回答by shmurf
By combining some of the principals in the existing answers I came up with
通过结合现有答案中的一些原则，我想出了
preg_split ('/\s*,+\s*/', 'red, green thing ,, ,, blue ,orange', NULL, PREG_SPLIT_NO_EMPTY);
The reasoning behind it is that I found a bug in this answer, where if there is a comma at the end of the string it'll return a blank element in the array. i.e.
其背后的原因是我在此答案中发现了一个错误，如果字符串末尾有逗号，它将返回数组中的空白元素。IE
preg_split ('/(\s*,*\s*)*,+(\s*,*\s*)*/', 'red, green thing ,, ,, blue ,orange,');
Results in
结果是
Array
(
[0] => red
[1] => green thing
[2] => blue
[3] => orange
[4] => ''
)
You can fix this by using PREG_SPLIT_NO_EMPTYas mentioned in this answerto remove it, but once you are doing that there is technically no need to remove consecutive commas via the regex, thus the shortened expression
您可以通过使用本答案中提到的PREG_SPLIT_NO_EMPTY将其删除来解决此问题，但是一旦您这样做，技术上就不需要通过正则表达式删除连续的逗号，因此缩短了表达式
回答by Amit Sharma
this how you replace and explode in a single line of code
这是你如何在一行代码中替换和爆炸
$str = 'red, green, blue ,orange';
$new_string = explode(',',preg_replace('/\s+/', '', $str));
will output the results as
将输出结果为
Array
(
[0] => red
[1] => green
[2] => blue
[3] => orange
)
回答by Dom
You can also do this with a one line regex
你也可以用一行正则表达式来做到这一点
preg_split('@(?:\s*,\s*|^\s*|\s*$)@', $str, NULL, PREG_SPLIT_NO_EMPTY);
回答by mickmackusa
SPECIFICALLYfor the OP's sample string, because each substring to be matched is a single word, you can use str_word_count().
特别是对于 OP 的示例字符串，因为要匹配的每个子字符串都是一个单词，所以您可以使用str_word_count()。
Code: (Demo)
代码：（演示）
$str = ' red, green, blue ,orange ';
var_export(str_word_count($str,1)); // 1 means return all words in an indexed array
Output:
输出：
array (
0 => 'red',
1 => 'green',
2 => 'blue',
3 => 'orange',
)
This can also be adapted for substrings beyond letters (and some hyphens and apostrophes -- if you read the fine print) by adding the necessary characters to the character mask / 3rd parameter.
通过将必要的字符添加到字符掩码/第三个参数，这也可以适用于字母以外的子字符串（以及一些连字符和撇号——如果你阅读了细则）。
Code: (Demo)
代码：（演示）
$str = " , Number1 , 234, 0 ,4heaven's-sake , ";
var_export(str_word_count($str,1,'0..9'));
Output:
输出：
array (
0 => 'Number1',
1 => '234',
2 => '0',
3 => '4heaven\'s-sake',
)
Again, I am treating this question very narrowly because of the sample string, but this will provide the same desired output:
同样，由于示例字符串，我非常狭隘地处理这个问题，但这将提供相同的所需输出：
Code: (Demo)
代码：（演示）
$str = ' red, green, blue ,orange ';
var_export(preg_match_all('/[^, ]+/',$str,$out)?$out[0]:'fail');
回答by Jason OOO
try this:
尝试这个：
$str = preg_replace("/\s*,\s*/", ",", 'red, green, blue ,orange');
回答by Sutandiono
You can use preg_split()for that.
您可以为此使用preg_split()。
$bar = preg_split ('/[,\s]+/', $str);
print_r ($bar);
/* Result:
Array
(
[0] => red
[1] => green
[2] => blue
[3] => orange
)
*/
回答by BlackWhite
$str = str_replace(" ","", $str);
