Home >Backend Development >PHP Tutorial >An array arithmetic problem, a three-dimensional array, how to eliminate 8 consecutive empty arrays with sk_id of each element in the sub-array of each array in the first layer?
An array arithmetic problem, a three-dimensional array, how to eliminate 8 consecutive empty arrays with sk_id of each element in the sub-array of each array in the first layer?
- WBOYOriginal
- 2016-09-08 08:43:511157browse
If each element of the sub-array in the large array has 8 consecutive sub-elements with empty sk_id, then this sub-array will be removed. The data is printed as follows:
<code>array(100) {
[0] =array(88){
[0] => array(8) {
["email"] => string(19) "13537951319@163.com"
["sno"] => string(15) "106725097310815"
["class_id"] => string(3) "559"
["user_id"] => string(4) "6648"
["date_time"] => string(10) "1473159600"
["classname"] => string(15) "呵呵呵呵呵"
["sk_id"] => NULL
["num"] => int(0)
}
[1] => array(8) {
["email"] => string(19) "13537951319@163.com"
["sno"] => string(15) "106725097310815"
["class_id"] => string(3) "559"
["user_id"] => string(4) "6648"
["date_time"] => string(10) "1473150900"
["classname"] => string(15) "呵呵呵呵呵"
["sk_id"] => NULL
["num"] => int(1)
}
[2] => array(8) {
["email"] => string(19) "13537951319@163.com"
["sno"] => string(15) "106725097310815"
["class_id"] => string(3) "559"
["user_id"] => string(4) "6648"
["date_time"] => string(10) "1473147900"
["classname"] => string(15) "呵呵呵呵呵"
["sk_id"] => NULL
["num"] => int(2)
}
[3] => array(8) {
["email"] => string(19) "13537951319@163.com"
["sno"] => string(15) "106725097310815"
["class_id"] => string(3) "559"
["user_id"] => string(4) "6648"
["date_time"] => string(10) "1473144600"
["classname"] => string(15) "呵呵呵呵呵"
["sk_id"] => NULL
["num"] => int(3)
}
....
},
[1] =array(88){
[0] => array(8) {
["email"] => string(19) "13537951319@163.com"
["sno"] => string(15) "106725097310815"
["class_id"] => string(3) "559"
["user_id"] => string(4) "6648"
["date_time"] => string(10) "1473159600"
["classname"] => string(15) "呵呵呵呵呵"
["sk_id"] => NULL
["num"] => int(0)
}
[1] => array(8) {
["email"] => string(19) "13537951319@163.com"
["sno"] => string(15) "106725097310815"
["class_id"] => string(3) "559"
["user_id"] => string(4) "6648"
["date_time"] => string(10) "1473150900"
["classname"] => string(15) "呵呵呵呵呵"
["sk_id"] => NULL
["num"] => int(1)
}
[2] => array(8) {
["email"] => string(19) "13537951319@163.com"
["sno"] => string(15) "106725097310815"
["class_id"] => string(3) "559"
["user_id"] => string(4) "6648"
["date_time"] => string(10) "1473147900"
["classname"] => string(15) "呵呵呵呵呵"
["sk_id"] => NULL
["num"] => int(2)
}
[3] => array(8) {
["email"] => string(19) "13537951319@163.com"
["sno"] => string(15) "106725097310815"
["class_id"] => string(3) "559"
["user_id"] => string(4) "6648"
["date_time"] => string(10) "1473144600"
["classname"] => string(15) "呵呵呵呵呵"
["sk_id"] => NULL
["num"] => int(3)
}
....
}
....
}</code>
Reply content:
If each element of the sub-array in the large array has 8 consecutive sub-elements with empty sk_id, then this sub-array will be removed. The data is printed as follows:
<code>array(100) {
[0] =array(88){
[0] => array(8) {
["email"] => string(19) "13537951319@163.com"
["sno"] => string(15) "106725097310815"
["class_id"] => string(3) "559"
["user_id"] => string(4) "6648"
["date_time"] => string(10) "1473159600"
["classname"] => string(15) "呵呵呵呵呵"
["sk_id"] => NULL
["num"] => int(0)
}
[1] => array(8) {
["email"] => string(19) "13537951319@163.com"
["sno"] => string(15) "106725097310815"
["class_id"] => string(3) "559"
["user_id"] => string(4) "6648"
["date_time"] => string(10) "1473150900"
["classname"] => string(15) "呵呵呵呵呵"
["sk_id"] => NULL
["num"] => int(1)
}
[2] => array(8) {
["email"] => string(19) "13537951319@163.com"
["sno"] => string(15) "106725097310815"
["class_id"] => string(3) "559"
["user_id"] => string(4) "6648"
["date_time"] => string(10) "1473147900"
["classname"] => string(15) "呵呵呵呵呵"
["sk_id"] => NULL
["num"] => int(2)
}
[3] => array(8) {
["email"] => string(19) "13537951319@163.com"
["sno"] => string(15) "106725097310815"
["class_id"] => string(3) "559"
["user_id"] => string(4) "6648"
["date_time"] => string(10) "1473144600"
["classname"] => string(15) "呵呵呵呵呵"
["sk_id"] => NULL
["num"] => int(3)
}
....
},
[1] =array(88){
[0] => array(8) {
["email"] => string(19) "13537951319@163.com"
["sno"] => string(15) "106725097310815"
["class_id"] => string(3) "559"
["user_id"] => string(4) "6648"
["date_time"] => string(10) "1473159600"
["classname"] => string(15) "呵呵呵呵呵"
["sk_id"] => NULL
["num"] => int(0)
}
[1] => array(8) {
["email"] => string(19) "13537951319@163.com"
["sno"] => string(15) "106725097310815"
["class_id"] => string(3) "559"
["user_id"] => string(4) "6648"
["date_time"] => string(10) "1473150900"
["classname"] => string(15) "呵呵呵呵呵"
["sk_id"] => NULL
["num"] => int(1)
}
[2] => array(8) {
["email"] => string(19) "13537951319@163.com"
["sno"] => string(15) "106725097310815"
["class_id"] => string(3) "559"
["user_id"] => string(4) "6648"
["date_time"] => string(10) "1473147900"
["classname"] => string(15) "呵呵呵呵呵"
["sk_id"] => NULL
["num"] => int(2)
}
[3] => array(8) {
["email"] => string(19) "13537951319@163.com"
["sno"] => string(15) "106725097310815"
["class_id"] => string(3) "559"
["user_id"] => string(4) "6648"
["date_time"] => string(10) "1473144600"
["classname"] => string(15) "呵呵呵呵呵"
["sk_id"] => NULL
["num"] => int(3)
}
....
}
....
}</code>
<code> foreach($arr as $k1 =>$v1){
$z=0;
foreach($v1 as $k2 =>$v2){
if(empty($v2['sk_id'])){
$z=$z+1;
}else{
$z=0;
}
if($z==8){
unset($arr[$k1]);
break;
}
}
}
print_r($arr);
</code>
Can you see if this is okay
Write a simple example, repeat three times in a row, and remove the subarray.
Array:
<code class="php">array(2) {
[0]=>
array(3) {
[0]=>
array(2) {
["key"]=>
int(0)
["sk_id"]=>
NULL
}
[1]=>
array(2) {
["key"]=>
int(1)
["sk_id"]=>
NULL
}
[2]=>
array(2) {
["key"]=>
int(2)
["sk_id"]=>
NULL
}
}
[1]=>
array(3) {
[0]=>
array(2) {
["key"]=>
int(0)
["sk_id"]=>
NULL
}
[1]=>
array(2) {
["key"]=>
int(1)
["sk_id"]=>
NULL
}
[2]=>
array(2) {
["key"]=>
int(2)
["sk_id"]=>
int(1)
}
}
}
</code>
Code:
<code class="php">$three = array(
array(
array(
'key' => 0,
'sk_id' => null
),
array(
'key' => 1,
'sk_id' => null
),
array(
'key' => 2,
'sk_id' => null
),
),
array(
array(
'key' => 0,
'sk_id' => null
),
array(
'key' => 1,
'sk_id' => null
),
array(
'key' => 2,
'sk_id' => 1
),
),
);
$result = array();
foreach($three as $key=>$value) {
$flag = 0;
foreach($value as $k => $v) {
if($v['sk_id'] == null) {
$flag += 1;
}
}
if($flag < 3) {
array_push($result,$value);
}
}
var_dump($result);
}</code>
Output:
<code class="php">array(1) {
[0]=>
array(3) {
[0]=>
array(2) {
["key"]=>
int(0)
["sk_id"]=>
NULL
}
[1]=>
array(2) {
["key"]=>
int(1)
["sk_id"]=>
NULL
}
[2]=>
array(2) {
["key"]=>
int(2)
["sk_id"]=>
int(1)
}
}
}</code>
Look at this idea, I didn’t do any testing
<code>function test($array)
{
$result = array();
foreach ($array as $key => $val) {
$flag = false;
foreach ($val as $k => $v) {
if ($v['sk_id'] != null) {
$flag = true;
}
}
if ($flag) {
$result[] = $val;
}
}
return $result;
}</code>
<code>foreach ($data $key=>$row){
$i=1;
foreach ($row as $k=>$r){
if (empty($r['sk_id'])){
$i++;
}
if (!empty($r['sk_id']) && $i<8){
$i=1;
}
if ($i>8){
unset($data[$key]);
break;
}
}
}</code>Statement：
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