PHP: Extracting values from the keys of array

Question

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);

Touheed Khan · Accepted Answer · 2017-04-26 09:28:17Z

2

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 );
        }
    }
}

edited Apr 26, 2017 at 9:28

answered Apr 26, 2017 at 3:45

Touheed Khan

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2 Comments

Rizier123 Over a year ago

While this code snippet may solve the question, including an explanation really helps to improve the quality of your post. Remember that you are answering the question for readers in the future, and those people might not know the reasons for your code suggestion. Please also try not to crowd your code with explanatory comments, this reduces the readability of both the code and the explanations!

Touheed Khan Over a year ago

@Rizier123 thanks.. I'll edit and improve my answer.

JYoThI · Accepted Answer · 2017-04-26 03:58:51Z

1

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
 )

edited Apr 26, 2017 at 3:58

answered Apr 26, 2017 at 3:45

JYoThI

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Comments

Sahil Gulati · Accepted Answer · 2017-04-26 03:44:54Z

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
)

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