PHP：从数组键中提取值

I have this code:

$arrmixData = array();
$arrmixData['maintenance_request'] = array(
'is_charge_post' => '1',
'is_material_post' => '1',
 'sub_maintenance_request_123456'=> array(
    'is_complete_sub_task' => '0'
    ),
'sub_maintenance_request_123465'=> array(
    'is_complete_sub_task' => '1'
    ));

After displaying the array it shows -

Array(
[maintenance_request] => Array
    (
        [is_charge_post] => 1
        [is_material_post] => 1
        [sub_maintenance_request_123456] => Array
            (
                [is_complete_sub_task] => 0
            )

        [sub_maintenance_request_123465] => Array
            (
                [is_complete_sub_task] => 1
            )

    ))

I want only id from the key "sub_maintenanace_request_". I tried for explode but its not work. Any suggestions.

Expected output:

$arrSubIds = (123456,123465);

Here we are using strpos function to retrieve position of substring with in a string and ltrim function to trim a substring from the left.

Try this code snippet here

<?php

$arrmixData = array();
$arrmixData['maintenance_request'] = array(
    'is_charge_post' => '1',
    'is_material_post' => '1',
    'sub_maintenance_request_123456' => array(
        'is_complete_sub_task' => '0'
    ),
    'sub_maintenance_request_123465' => array(
        'is_complete_sub_task' => '1'
        ));
$result=array();
foreach($arrmixData["maintenance_request"] as $key => $value)
{
    if(strpos($key, "sub_maintenance_request_")===0)//getting the position of substring
    {
        $result[]=ltrim($key,"sub_maintenance_request_");trimmed substring to retrieve last digits
    }
}
print_r($result);

Output:

Array
(
    [0] => 123456
    [1] => 123465
)

use Explode and strpos

1) strpos to check current key is sub_maintenance_request_ or not

2) if it's sub_maintenance_request_ then use explode by "_"underscore.

3) Get the last value from exploded array using array_pop()

<?php

$arrSubIds=array();
foreach($arrmixData['maintenance_request'] as $key=>$row)
{

   if(strpos($key, 'sub_maintenance_request_') !== false)
   {
      $arrSubIds[] = array_pop(explode('_',$key)); 

   }

}

print_r($arrSubIds);

?>

Output:

Array
(
    [0] => 123456
    [1] => 123465
 )

Code Snippet

You can iterate on each key and check if key has 'sub_maintenance_request' or not. Further you check if it has digit or not, if it has digit you can store matched digit.

$result has the final result.

Try this :

$arrmixData = array();
$arrmixData['maintenance_request'] = array(
    'is_charge_post' => '1',
    'is_material_post' => '1',
    'sub_maintenance_request_123456'=> array(
        'is_complete_sub_task' => '0'
    ),
    'sub_maintenance_request_123465'=> array(
        'is_complete_sub_task' => '1'
        )
    );
$result = array();
//Itetrate on each key
foreach($arrmixData['maintenance_request'] as $key=> $value){
    //check if key has 'sub_maintenance_request_' in it or not
    if (strpos($key, 'sub_maintenance_request_') !== false) {
        //check if key contains digits if yes then store them in $result
        if (preg_match('#(\d+)$#', $key, $matches)) {
            $result[] = array_shift( $matches );
        }
    }
}