php 如何删除数组键中的前缀
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How to remove prefix in array keys
提问by rat4m3n
I try to remove a prefix in array keys and every attempt is failing. What I want to achieve is to:
我尝试删除数组键中的前缀，但每次尝试都失败了。我想要实现的是：
Having: Array ( [attr_Size] => 3 [attr_Colour] => 7 )
拥有： Array ( [attr_Size] => 3 [attr_Colour] => 7 )
To Get: Array ( [Size] => 3 [Colour] => 7 )
要得到： Array ( [Size] => 3 [Colour] => 7 )
Your help will be much appreciated...
您的帮助将不胜感激...
采纳答案by TigerTiger
One of the ways To Get:Array ( [Size] => 3 [Colour] => 7 )From your Having: Array ( [attr_Size] => 3 [attr_Colour] => 7 )
获取方式之一：Array ( [Size] => 3 [Colour] => 7 )从您的Having: Array ( [attr_Size] => 3 [attr_Colour] => 7 )
$new_arr = array();
foreach($Your_arr as $key => $value) {
list($dummy, $newkey) = explode('_', $key);
$new_arr[$newkey] = $value;
}
If you think there'll be multiple underscores in keys just replace first line inside foreach with list($dummy, $newkey) = explode('attr_', $key);
如果您认为键中会有多个下划线，只需将 foreach 中的第一行替换为 list($dummy, $newkey) = explode('attr_', $key);
回答by Frosty Z
If I understood your question, you don't have to use implode()to get what you want.
如果我理解你的问题，你就不必使用implode()来得到你想要的。
define(PREFIX, 'attr_');
$array = array('attr_Size' => 3, 'attr_Colour' => 7);
$prefixLength = strlen(PREFIX);
foreach($array as $key => $value)
{
if (substr($key, 0, $prefixLength) === PREFIX)
{
$newKey = substr($key, $prefixLength);
$array[$newKey] = $value;
unset($array[$key]);
}
}
print_r($array); // shows: Array ( [Size] => 3 [Colour] => 7 )
回答by Ligemer
Here's something else to chew on that can be reused for multiple arrays in your application that have different key prefixes. This would be useful if you have Redis prefixed keys to remap or something of that nature.
这里还有一些需要注意的东西，它可以重用于应用程序中具有不同键前缀的多个数组。如果你有 Redis 前缀的键来重新映射或类似的东西，这将很有用。
$inputArray = array('attr_test' => 'test', 'attr_two' => 'two');
/**
* Used to remap keys of an array by removing the prefix passed in
*
* Example:
* $inputArray = array('app_test' => 'test', 'app_two' => 'two');
* $keys = array_keys($inputArray);
* array_walk($keys, 'removePrefix', 'app_');
* $remappedArray = array_combine($keys, $inputArray);
*
* @param $value - key value to replace, should be from array_keys
* @param $omit - unused, needed for prefix call
* @param $prefix - prefix to string replace in keys
*/
function removePrefix(&$value, $omit, $prefix) {
$value = str_replace($prefix, '', $value);
}
// first get all the keys to remap
$keys = array_keys($inputArray);
// perform internal iteration with prefix passed into walk function for dynamic replace of key
array_walk($keys, 'removePrefix', 'attr_');
// combine the rewritten keys and overwrite the originals
$remappedArray = array_combine($keys, $inputArray);
// see full output of comparison
var_dump($inputArray);
var_dump($remappedArray);
Output:
输出：
array(2) {
'attr_test' =>
string(4) "test"
'attr_two' =>
string(3) "two"
}
array(2) {
'test' =>
string(4) "test"
'two' =>
string(3) "two"
}
