PHP - 从以特定字符串开头的数组中获取所有键
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PHP - get all keys from a array that start with a certain string
提问by Alex
I have an array that looks like this:
我有一个看起来像这样的数组：
array(
'abc' => 0,
'foo-bcd' => 1,
'foo-def' => 1,
'foo-xyz' => 0,
// ...
)
How can I get only the elements that start with foo-?
如何只获取以 开头的元素foo-？
采纳答案by Developer-Sid
$arr_main_array = array('foo-test' => 123, 'other-test' => 456, 'foo-result' => 789);
foreach($arr_main_array as $key => $value){
$exp_key = explode('-', $key);
if($exp_key[0] == 'foo'){
$arr_result[] = $value;
}
}
if(isset($arr_result)){
print_r($arr_result);
}
回答by erisco
Functional approach:
函数式方法：
Pick up an array_filter_keysort of function from the comments in http://php.net/array_filteror write your own. Then you could do:
array_filter_key从http://php.net/array_filter的评论中选择一种函数或编写自己的函数。那么你可以这样做：
$array = array_filter_key($array, function($key) {
return strpos($key, 'foo-') === 0;
});
Procedural approach:
程序方法：
$only_foo = array();
foreach ($array as $key => $value) {
if (strpos($key, 'foo-') === 0) {
$only_foo[$key] = $value;
}
}
Procedural approach using objects:
使用对象的过程方法：
$i = new ArrayIterator($array);
$only_foo = array();
while ($i->valid()) {
if (strpos($i->key(), 'foo-') === 0) {
$only_foo[$i->key()] = $i->current();
}
$i->next();
}
回答by Alex
This is how I would do it, though I can't give you a more efficient advice before understanding what you want to do with the values you get.
这就是我的做法，尽管在了解您想用所获得的值做什么之前，我无法给您更有效的建议。
$search = "foo-";
$search_length = strlen($search);
foreach ($array as $key => $value) {
if (substr($key, 0, $search_length) == $search) {
...use the $value...
}
}
回答by Suresh Velusamy
Simply I used array_filterfunction to achieve the solution as like follows
简单地我使用array_filter函数来实现解决方案如下
<?php
$input = array(
'abc' => 0,
'foo-bcd' => 1,
'foo-def' => 1,
'foo-xyz' => 0,
);
$filtered = array_filter($input, function ($key) {
return strpos($key, 'foo-') === 0;
}, ARRAY_FILTER_USE_KEY);
print_r($filtered);
Output
输出
Array
(
[foo-bcd] => 1
[foo-def] => 1
[foo-xyz] => 0
)
For live check https://3v4l.org/lJCse
回答by biziclop
回答by Tim Cooper
foreach($arr as $key => $value)
{
if(preg_match('/^foo-/', $key))
{
// You can access $value or create a new array based off these values
}
}
回答by Keyur
Modification to erisco's Functional approach,
修改erisco的功能方法，
array_filter($signatureData[0]["foo-"], function($k) {
return strpos($k, 'foo-abc') === 0;
}, ARRAY_FILTER_USE_KEY);
this worked for me.
这对我有用。
回答by Netsurfer
In addition to @Suresh Velusamy's answer above (which needs at least PHP 5.6.0) you can use the following if you are on a prior version of PHP:
除了上面@Suresh Velusamy 的回答（至少需要 PHP 5.6.0）之外，如果您使用的是早期版本的 PHP，您还可以使用以下内容：
<?php
$input = array(
'abc' => 0,
'foo-bcd' => 1,
'foo-def' => 1,
'foo-xyz' => 0,
);
$filtered = array_filter(array_keys($input), function($key) {
return strpos($key, 'foo-') === 0;
});
print_r($filtered);
/* Output:
Array
(
[1] => foo-bcd
[2] => foo-def
[3] => foo-xyz
)
// the numerical array keys are the position in the original array!
*/
// if you want your array newly numbered just add:
$filtered = array_values($filtered);
print_r($filtered);
/* Output:
Array
(
[0] => foo-bcd
[1] => foo-def
[2] => foo-xyz
)
*/
