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
这也是一个有效的解决方案:
function array_insert(&$array,$element,$position=null) {
if (count($array) == 0) {
$array[] = $element;
}
elseif (is_numeric($position) && $position < 0) {
if((count($array)+position) < 0) {
$array = array_insert($array,$element,0);
}
else {
$array[count($array)+$position] = $element;
}
}
elseif (is_numeric($position) && isset($array[$position])) {
$part1 = array_slice($array,0,$position,true);
$part2 = array_slice($array,$position,null,true);
$array = array_merge($part1,array($position=>$element),$part2);
foreach($array as $key=>$item) {
if (is_null($item)) {
unset($array[$key]);
}
}
}
elseif (is_null($position)) {
$array[] = $element;
}
elseif (!isset($array[$position])) {
$array[$position] = $element;
}
$array = array_merge($array);
return $array;
}
获奖者: http://binarykitten.com/php/52-php-insert-element-and-shift.html
其他回答
通常,使用标量值:
$elements = array('foo', ...);
array_splice($array, $position, $length, $elements);
要在数组中插入一个数组元素,不要忘记将数组包装在数组中(因为它是一个标量值!):
$element = array('key1'=>'value1');
$elements = array($element);
array_splice($array, $position, $length, $elements);
否则,数组的所有键都将逐条添加。
试试这个:
$colors = array('red', 'blue', 'yellow');
$colors = insertElementToArray($colors, 'green', 2);
function insertElementToArray($arr = array(), $element = null, $index = 0)
{
if ($element == null) {
return $arr;
}
$arrLength = count($arr);
$j = $arrLength - 1;
while ($j >= $index) {
$arr[$j+1] = $arr[$j];
$j--;
}
$arr[$index] = $element;
return $arr;
}
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(
$arr,
"email",
[
"phone" => [
"type" => "string",
"format" => "phone",
],
]
);
// ->
array (
'name' =>
array (
'type' => 'string',
'maxlength' => '30',
),
'phone' =>
array (
'type' => 'string',
'format' => 'phone',
),
'email' =>
array (
'type' => 'email',
'maxlength' => '150',
),
)
function array_insert($array, $position, $insert) {
if ($position > 0) {
if ($position == 1) {
array_unshift($array, array());
} else {
$position = $position - 1;
array_splice($array, $position, 0, array(
''
));
}
$array[$position] = $insert;
}
return $array;
}
电话的例子:
$array = array_insert($array, 1, ['123', 'abc']);
如果你有正则数组,没有什么特别的,这就可以了。记住,使用array_splice()插入元素实际上意味着在开始索引之前插入。移动元素时要小心,因为向上移动意味着$targetIndex -1,向下移动意味着$targetIndex + 1。
class someArrayClass
{
private const KEEP_EXISTING_ELEMENTS = 0;
public function insertAfter(array $array, int $startIndex, $newElements)
{
return $this->insertBefore($array, $startIndex + 1, $newElements);
}
public function insertBefore(array $array, int $startIndex, $newElements)
{
return array_splice($array, $startIndex, self::KEEP_EXISTING_ELEMENTS, $newElements);
}
}