如何将一个新项目插入到数组的任何位置,例如在数组的中间?
当前回答
可以在整数和字符串位置进行插入的函数:
/**
* @param array $array
* @param int|string $position
* @param mixed $insert
*/
function array_insert(&$array, $position, $insert)
{
if (is_int($position)) {
array_splice($array, $position, 0, $insert);
} else {
$pos = array_search($position, array_keys($array));
$array = array_merge(
array_slice($array, 0, $pos),
$insert,
array_slice($array, $pos)
);
}
}
整数的用法:
$arr = ["one", "two", "three"];
array_insert(
$arr,
1,
"one-half"
);
// ->
array (
0 => 'one',
1 => 'one-half',
2 => 'two',
3 => 'three',
)
字符串的用法:
$arr = [
"name" => [
"type" => "string",
"maxlength" => "30",
],
"email" => [
"type" => "email",
"maxlength" => "150",
],
];
array_insert(
$arr,
"email",
[
"phone" => [
"type" => "string",
"format" => "phone",
],
]
);
// ->
array (
'name' =>
array (
'type' => 'string',
'maxlength' => '30',
),
'phone' =>
array (
'type' => 'string',
'format' => 'phone',
),
'email' =>
array (
'type' => 'email',
'maxlength' => '150',
),
)
其他回答
没有本地PHP函数(据我所知)可以完全完成您的请求。
我已经写了2个我认为适合目的的方法:
function insertBefore($input, $index, $element) {
if (!array_key_exists($index, $input)) {
throw new Exception("Index not found");
}
$tmpArray = array();
$originalIndex = 0;
foreach ($input as $key => $value) {
if ($key === $index) {
$tmpArray[] = $element;
break;
}
$tmpArray[$key] = $value;
$originalIndex++;
}
array_splice($input, 0, $originalIndex, $tmpArray);
return $input;
}
function insertAfter($input, $index, $element) {
if (!array_key_exists($index, $input)) {
throw new Exception("Index not found");
}
$tmpArray = array();
$originalIndex = 0;
foreach ($input as $key => $value) {
$tmpArray[$key] = $value;
$originalIndex++;
if ($key === $index) {
$tmpArray[] = $element;
break;
}
}
array_splice($input, 0, $originalIndex, $tmpArray);
return $input;
}
虽然速度更快,而且可能更节省内存,但这只适用于不需要维护数组键的地方。
如果你确实需要维护密钥,下面的方法会更合适;
function insertBefore($input, $index, $newKey, $element) {
if (!array_key_exists($index, $input)) {
throw new Exception("Index not found");
}
$tmpArray = array();
foreach ($input as $key => $value) {
if ($key === $index) {
$tmpArray[$newKey] = $element;
}
$tmpArray[$key] = $value;
}
return $input;
}
function insertAfter($input, $index, $newKey, $element) {
if (!array_key_exists($index, $input)) {
throw new Exception("Index not found");
}
$tmpArray = array();
foreach ($input as $key => $value) {
$tmpArray[$key] = $value;
if ($key === $index) {
$tmpArray[$newKey] = $element;
}
}
return $tmpArray;
}
在做了几天之后,这是我能找到的最简单的解决方案。
$indexnumbertoaddat // this is a variable that points to the index # where you
want the new array to be inserted
$arrayToAdd = array(array('key' => $value, 'key' => $value)); //this is the new
array and it's values that you want to add. //the key here is to write it like
array(array('key' =>, since you're adding this array inside another array. This
is the point that a lot of answer left out.
array_splice($originalArray, $indexnumbertoaddatt, 0, $arrayToAdd); //the actual
splice function. You're doing it to $originalArray, at the index # you define,
0 means you're just shifting all other index items down 1, and then you add the
new array.
你可能会觉得这更直观一些。它只需要调用array_splice一个函数:
$original = array( 'a', 'b', 'c', 'd', 'e' );
$inserted = array( 'x' ); // not necessarily an array, see manual quote
array_splice( $original, 3, 0, $inserted ); // splice in at position 3
// $original is now a b c x d e
如果replacement只是一个元素,则没有必要在它周围加上array(),除非该元素本身是数组、对象或NULL。
RETURN VALUE:需要注意的是,函数不返回所需的替换。$original通过引用传递,并在适当的位置进行编辑。请参阅参数列表中带有&的表达式array &$array。
$a = array(1, 2, 3, 4);
$b = array_merge(array_slice($a, 0, 2), array(5), array_slice($a, 2));
// $b = array(1, 2, 5, 3, 4)
杰伊的解决方案。李是完美的。如果要向多维数组中添加项,请先添加一个一维数组,然后再替换它。
$original = (
[0] => Array
(
[title] => Speed
[width] => 14
)
[1] => Array
(
[title] => Date
[width] => 18
)
[2] => Array
(
[title] => Pineapple
[width] => 30
)
)
将相同格式的项添加到此数组中将添加所有新的数组索引作为项,而不仅仅是项。
$new = array(
'title' => 'Time',
'width' => 10
);
array_splice($original,1,0,array('random_string')); // can be more items
$original[1] = $new; // replaced with actual item
注意:使用array_splice直接向多维数组添加项会将其所有索引作为项添加,而不仅仅是该项。