ScotlandPHP 2016

ArrayIterator::seek

(PHP 5 >= 5.0.0)

ArrayIterator::seekجستجوی موقعیت

Description

void ArrayIterator::seek ( int $position )
Warning

This function is currently not documented; only its argument list is available.

Parameters

position

جستجوی موقعیت.

Return Values

No value is returned.

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User Contributed Notes 2 notes

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3
jon at ngsthings dot com
7 years ago
<?php
// didn't see any code demos...here's one from an app I'm working on

$array = array('1' => 'one',
              
'2' => 'two',
              
'3' => 'three');

$arrayobject = new ArrayObject($array);
$iterator = $arrayobject->getIterator();

if(
$iterator->valid()){
   
$iterator->seek(1);            // expected: two, output: two
   
echo $iterator->current();    // two
}

?>
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1
foalford at gmail dot com
4 months ago
<?php
//seek alter the iterator's internal indice instead of the value that key() returns.
//This is a big trap if combining with uasort/natsort function.

$a = new ArrayObject([4,3,2,1]);
$it = $a->getIterator();
$it->natsort();   //The Iterator preserve the key while sorting the array
$it->rewind();
$first = $it->key();   //The first element is  1 and it's key is 3
echo $first. PHP_EOL// 3

$it->next();
$second = $it->key();
echo
$second. PHP_EOL; //2

$it->next();
$it->seek($first);             //Was intended to seek to element 1, key 3, indice 0
echo  $it->key() . PHP_EOL; //end up 0 because seek took parameter as indice instead of key. It seek to element indice 3, element 4 key 0.

var_dump($it);

/* Output:
3
2
0
object(ArrayIterator)#2 (1) {
  ["storage":"ArrayIterator":private]=>
  object(ArrayObject)#1 (1) {
    ["storage":"ArrayObject":private]=>
    array(4) {
      [3]=>
      int(1)
      [2]=>
      int(2)
      [1]=>
      int(3)
      [0]=>
      int(4)
    }
  }
}
*/
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