假设我们有两个数组:
$array_1 = array(
'0' => 'zero',
'1' => 'one',
'2' => 'two',
'3' => 'three',
);
$array_2 = array(
'zero' => '0',
'one' => '1',
'two' => '2',
'three' => '3',
);
现在,我想在每个数组的第三个元素后插入数组('sample_key' => 'sample_value')。我该怎么做呢?
代码:
function insertValueAtPosition($arr, $insertedArray, $position) {
$i = 0;
$new_array=[];
foreach ($arr as $key => $value) {
if ($i == $position) {
foreach ($insertedArray as $ikey => $ivalue) {
$new_array[$ikey] = $ivalue;
}
}
$new_array[$key] = $value;
$i++;
}
return $new_array;
}
例子:
$array = ["A"=8, "K"=>3];
$insert_array = ["D"= 9];
insertValueAtPosition($array, $insert_array, $position=2);
// result ====> ["A"=>8, "D"=>9, "K"=>3];
也许看起来不完美,但很有效。
我刚刚创建了一个ArrayHelper类,它可以使数值索引变得非常容易。
class ArrayHelper
{
/*
Inserts a value at the given position or throws an exception if
the position is out of range.
This function will push the current values up in index. ex. if
you insert at index 1 then the previous value at index 1 will
be pushed to index 2 and so on.
$pos: The position where the inserted value should be placed.
Starts at 0.
*/
public static function insertValueAtPos(array &$array, $pos, $value) {
$maxIndex = count($array)-1;
if ($pos === 0) {
array_unshift($array, $value);
} elseif (($pos > 0) && ($pos <= $maxIndex)) {
$firstHalf = array_slice($array, 0, $pos);
$secondHalf = array_slice($array, $pos);
$array = array_merge($firstHalf, array($value), $secondHalf);
} else {
throw new IndexOutOfBoundsException();
}
}
}
例子:
$array = array('a', 'b', 'c', 'd', 'e');
$insertValue = 'insert';
\ArrayHelper::insertValueAtPos($array, 3, $insertValue);
开始$数组:
Array (
[0] => a
[1] => b
[2] => c
[3] => d
[4] => e
)
结果:
Array (
[0] => a
[1] => b
[2] => c
[3] => insert
[4] => d
[5] => e
)
$list = array(
'Tunisia' => 'Tunis',
'Germany' => 'Berlin',
'Italy' => 'Rom',
'Egypt' => 'Cairo'
);
$afterIndex = 2;
$newVal= array('Palestine' => 'Jerusalem');
$newList = array_merge(array_slice($list,0,$afterIndex+1), $newVal,array_slice($list,$afterIndex+1));
代码:
function insertValueAtPosition($arr, $insertedArray, $position) {
$i = 0;
$new_array=[];
foreach ($arr as $key => $value) {
if ($i == $position) {
foreach ($insertedArray as $ikey => $ivalue) {
$new_array[$ikey] = $ivalue;
}
}
$new_array[$key] = $value;
$i++;
}
return $new_array;
}
例子:
$array = ["A"=8, "K"=>3];
$insert_array = ["D"= 9];
insertValueAtPosition($array, $insert_array, $position=2);
// result ====> ["A"=>8, "D"=>9, "K"=>3];
也许看起来不完美,但很有效。