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?
当前回答
我已经创建了一个函数(PHP 8.1)，它允许您将项插入到关联数组或数值数组:
function insertItemsToPosition(array $array, string|int $insertAfterPosition, array $itemsToAdd): array
{
$insertAfterIndex = array_search($insertAfterPosition, array_keys($array), true);
if ($insertAfterIndex === false) {
throw new \UnexpectedValueException(sprintf('You try to insert items to an array after the key "%s", but this key is not existing in given array. Available keys are: %s', $insertAfterPosition, implode(', ', array_keys($array))));
}
$itemsBefore = array_slice($array, 0, $insertAfterIndex + 1);
$itemsAfter = array_slice($array, $insertAfterIndex + 1);
return $itemsBefore + $itemsToAdd + $itemsAfter;
}
其他回答
非常简单的2个字符串回答你的问题:
$array_1 = array(
'0' => 'zero',
'1' => 'one',
'2' => 'two',
'3' => 'three',
);
首先，你用array_splice向第三个元素插入任何东西，然后给这个元素赋值:
array_splice($array_1, 3, 0 , true);
$array_1[3] = array('sample_key' => 'sample_value');
对于第一个数组，使用array_splice():
$array_1 = array(
'0' => 'zero',
'1' => 'one',
'2' => 'two',
'3' => 'three',
);
array_splice($array_1, 3, 0, 'more');
print_r($array_1);
输出:
Array(
[0] => zero
[1] => one
[2] => two
[3] => more
[4] => three
)
对于第二个，没有顺序，所以你只需要做:
$array_2['more'] = '2.5';
print_r($array_2);
把钥匙按你想要的排序。
我已经创建了一个函数(PHP 8.1)，它允许您将项插入到关联数组或数值数组:
function insertItemsToPosition(array $array, string|int $insertAfterPosition, array $itemsToAdd): array
{
$insertAfterIndex = array_search($insertAfterPosition, array_keys($array), true);
if ($insertAfterIndex === false) {
throw new \UnexpectedValueException(sprintf('You try to insert items to an array after the key "%s", but this key is not existing in given array. Available keys are: %s', $insertAfterPosition, implode(', ', array_keys($array))));
}
$itemsBefore = array_slice($array, 0, $insertAfterIndex + 1);
$itemsAfter = array_slice($array, $insertAfterIndex + 1);
return $itemsBefore + $itemsToAdd + $itemsAfter;
}
试试这个===
$key_pos=0;
$a1=array("a"=>"red", "b"=>"green", "c"=>"blue", "d"=>"yellow");
$arrkey=array_keys($a1);
array_walk($arrkey,function($val,$key) use(&$key_pos) {
if($val=='b')
{
$key_pos=$key;
}
});
$a2=array("e"=>"purple");
$newArray = array_slice($a1, 0, $key_pos, true) + $a2 +
array_slice($a1, $key_pos, NULL, true);
print_r($newArray);
输出
Array (
[a] => red
[e] => purple
[b] => green
[c] => blue
[d] => yellow )
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。
