Foreach last item gets methode-CodePudding

Guys I have an array with objects, I want the last item in the foreach loop do something else then the rest. How do I archive that?

if(sizeof($testDup) > 3){
    } else {
        foreach ($testDup as $d) {  
        }
    }

$test array(3)
    432 => test_id -> 21
    431 => test_id -> 21
    435 => test_id -> 21

CodePudding user response：

you can compare the current one with the end():

class Test {
    public function __construct(private string $name) {}
    
    public function read(): string {
        return sprintf('%s: hurray', $this->name);
    }
    
    public function readLast():string {
        return sprintf('%s: am I last?', $this->name);
    }
}



$array = [
    new Test('first'),
    new Test('second'),
    new Test('third'),
    new Test('fourth'),
    ];
              
foreach( $array as $object ){
    if($object === end($array)) {
        echo $object->readLast().PHP_EOL;
    }else{
        echo $object->read().PHP_EOL;
    }
}

CodePudding user response：

This will process the array of objects and do something else with the last element:

    $data = '';
    $arrayWithObjects = array(
        (object)array('test1', 'test2'),
        (object)array('test1', 'test2'),
        (object)array('test1', 'test2'),
    );

    foreach ($arrayWithObjects as $object) {
        // Can't get next in the array, so is last element
        if (!next($arrayWithObjects)) {
            // Process last element
            $data .= $object->{1};
        } else {
            // Process all other elements
            $data .= $object->{0};
        }
    }

    var_dump($data); // "test1test1test2"

CodePudding user response：

As an alternative to checking if the current item is the last one (which the other answers show), you could use array_slice() to get the start of the array to loop over and then end() to get the last element of the array.

$data = [/*...*/]

foreach ($item as array_splice($data, 0, -1, true) {
   $item->foo();
}

if (($item = end($data) !== false) {
    $item->bar();
}

In my opinion, this code is easier to read (and metrics like cyclomatic complexity agree) than the nested if $item === end($data) check. If the same is true on your specific case will depend on what, exactly is in the loop and how much of it is different.

In addition, if your array is large, this approach may offer (slightly) better performance (but if your array is large and a small performance difference is important, don't take my word for this - benchmark both solutions with read data).

CodePudding user response：

It's so easy: When the loop is finished, you still got the last element!!

if (!empty($arr)) {
    foreach ($arr as $item) {
        ; // Do something with $item
    }

    // Here you still got last $item
    echo var_export($item, true);
}