从string PHP结束SUBSTR？ [英] Substr from end of string php?

问题描述

我有这种类型的数组，我会变得非常简单易懂。

I have this kind of array, i will make it very simple to understand

$picture = ( 'artist2-1_thumb.jpg',
             'artist2-2.jpg' ,
             'artist2-3_thumb.jpg',
             'artist2-4.jpg',
             'artist2-5_thumb.jpg');

现在我想用SUBSTR获得新的数组只有拇指，能有新的数组像这样

Now i want use substr to get new array that only have thumb, to have new array like this

$picturethumbs = ( 'artist2-1_thumb.jpg',
                   'artist2-3_thumb.jpg',
                   'artist2-5_thumb.jpg');

可以将某些SUBSTR但哪里开始呢？

Can some substr but where to start?

推荐答案

您可以使用的 array_filter（） 到数组进行筛选，只返回匹配给定的条件下哪些项目：

You could use array_filter() to filter the array, returning only items which match the given condition:

$picturethumbs = array_filter($picture, function($v) {
  return stristr($v, '_thumb'); 
});

将返回包含字符串 _thumb 所有数组项。如果你不知道该文件的扩展名这可能是有用的，或者如果 _thumb 显得比字符串的结尾（例如：其他地方my_thumb.gif 将仍然匹配）

Would return all array items which contain the string _thumb. This could be useful if you don't know the extension of the file, or if _thumb appears somewhere other than the end of the string (eg. my_thumb.gif would still match)

$picturethumbs = array_filter($picture, function($v) {
  return substr($v, -10) === '_thumb.jpg'; 
});

将返回其中最后10个字符匹配 _thumb.jpg 。

两者（给你的例子数组）输出：

Both (given your example array) output:

array
  0 => string 'artist2-1_thumb.jpg' (length=19)
  2 => string 'artist2-3_thumb.jpg' (length=19)
  4 => string 'artist2-5_thumb.jpg' (length=19)

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