[英]PHP Search array recursively and return count of index?
是否有一个PHP函数,允许您递归搜索数组并返回某个键'x'出现的实例数(无论有多深)?
I would use array_walk_recursive()
. 我会使用array_walk_recursive()
。 Example: 例:
$a = array(1,2,3,'x',array(4,5,'x',array(6,7,8,'x')));
$v = "x";
$i = 0;
array_walk_recursive($a, function($val, $key) use (&$i, $v) {
if ($val == $v) {
$i++;
}
});
echo $i;
Output: 输出:
3
You can traverse the array recursively (that is regardless of the depth) and then count the values: 您可以递归遍历数组(无论深度如何),然后计算值:
$array = array(1, 2, 3, 'x', array(4, 5, 'x', array(6, 7, 8, 'x')));
$rit = new RecursiveIteratorIterator(new RecursiveArrayIterator($array));
$xCount = 0;
foreach ($rit as $value) {
if ($value === 'x') {
$xCount++;
}
}
var_dump($xCount); # int(3)
A variation of this is to convert this iteration into an array again and count values: 这种变化是将此迭代再次转换为数组并计算值:
$array = array(1, 2, 3, 'x', array(4, 5, 'x', array(6, 7, 8, 'x')));
$rit = new RecursiveIteratorIterator(new RecursiveArrayIterator($array));
$allCount = array_count_values(iterator_to_array($rit, FALSE));
print_r($allCount);
Output/Result: 输出/结果:
Array
(
[1] => 1
[2] => 1
[3] => 1
[x] => 3
[4] => 1
[5] => 1
[6] => 1
[7] => 1
[8] => 1
)
See as well: 另见:
You could write a simple recursive function that does what you want. 您可以编写一个简单的递归函数来执行您想要的操作。 I didn't test this, but the idea would be something like: 我没有测试这个,但想法是这样的:
$count = 0;
function findKey($array,&$count){
if(!empty($array)){
foreach($array as $key => $childArray){
if($key == 'keyImLookingFor'){
$count++;
}
findKey($childArray,$count);
}
}
}
$count should then contain your number of key occurrences. 然后$ count应包含您的密钥出现次数。 Again, this might need some cleanup. 同样,这可能需要一些清理。
$array = array(
'key1' => 'val1',
'key2' => 'val2',
'key3' => array('key1' => 'val3'));
$count = 0;
function key_count($val, $key){
global $count;
if($key == "key1"){
$count++;
}
}
array_walk_recursive($array, 'key_count');
echo $count;
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