PHP, Changing values in an multidimensional array-CodePudding

I got the following Array in PHP:

$data[] = array('Slug' => 'jan', 'Name' => 'Jan', 'Alter' => '39', 'Jahrgang' => '1981', 'ID' => '3');
$data[] = array('Slug' => 'kjell', 'Name' => 'Kjell', 'Alter' => '4', 'Jahrgang' => '2018', 'ID' => '0');
$data[] = array('Slug' => 'bjarne', 'Name' => 'Bjarne', 'Alter' => '6', 'Jahrgang' => '2015', 'ID' => '2');
$data[] = array('Slug' => 'monika', 'Name' => 'Monika', 'Alter' => '72', 'Jahrgang' => '1950', 'ID' => '1');

How can I output the Value of "Jahrgang" where "Slug = Jan"?

How can I change the "Jahrgang" where "Slug = Jan" from 1981 to 1982?

Is there any way without a foreach?

Thank you so much!

CodePudding user response：

It can be done with pair array_search and array_column like this:

$key = array_search('jan', array_column($data, 'Slug'));

array_column returns single dimension array only with given key, in this case Slug, and then array_search returns key of this value in reduced array with should be same as in main one. So for questions it would be:

echo $data[array_search('jan', array_column($data, 'Slug'))]['Jahrgang'];

$data[array_search('jan', array_column($data, 'Slug'))]['Jahrgang'] = '1982';

CodePudding user response：

I would opt to slightly restructure the data for easier access, by setting the array key to the Slug value.

$data['jan'] = array('Name' => 'Jan', 'Alter' => '39', 'Jahrgang' => '1981', 'ID' => '3');
$data['kjell'] = array('Name' => 'Kjell', 'Alter' => '4', 'Jahrgang' => '2018', 'ID' => '0');
$data['bjarne'] = array('Name' => 'Bjarne', 'Alter' => '6', 'Jahrgang' => '2015', 'ID' => '2');
$data['monika'] = array('Name' => 'Monika', 'Alter' => '72', 'Jahrgang' => '1950', 'ID' => '1');

This would allow you to access or set any values using that key.

//access
$info = $data['jan']; //array('Name' => 'Jan', 'Alter' => '39', 'Jahrgang' => '1981', 'ID' => '3')

//set
$data['jan']['Name'] = 'Not Jan';

//loop
foreach($data as $slug => $info) {
    //$info = array('Name' => 'Jan', 'Alter' => '39', 'Jahrgang' => '1981', 'ID' => '3')
}

Another plus side to this method in your case is it makes sure each "Slug" is unique, because arrays cannot contain duplicate keys.

CodePudding user response：

You could use "function" instead of "nested foreach" like this:

        function replace($data,$index){
        
        // count array length
        $num = count($data);
    
        if($index < $num){
            if($data[$index]['Slug'] === 'jan'){
                
                $a = [ $index => [ "Jahrgang"  => "1982" ] ] ;
            
                // replace new array with new values
                $re = array_replace($data,$a);
                
                return $re;
    
            }else{
    
                $index   ;
                check($data,$index);
            }
        }
                
    
    }
    
    replace($data,0);