PHP array pointer study notes (1)-PHP Tutorial-php.cn

PHP array pointer study notes (1)

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Release： 2016-07-28 08:29:42

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There is such a problem. In an array queue, the array length is fixed. When inserting elements into the input, after the maximum length is exceeded, the array automatically starts overwriting and filling.

At this time, the entire array forms a ring. As shown below.When the array is less than the specified length, add elements directly

php数组指针学习笔记（一） use using each to take out the element of the current pointer and move the pointer down

List ($ k, $ v) = EACH ($ test_array);

// Generally use the mold taking algorithm, obtain the key to be covered, and then directly overwrite

$ k = $ k % 12;
$test_array[$k] = $value;

}

}
push_array(0,$test_array);

push_array(1,$test_array);

push_array(2,$test_array);
push_array(3,$test_array);

push_array(4,$test_array);

push_array(5,$test_array);
push_array(6,$test_array);

push_array(7,$test_array);

push_array(8,$test_array);

push_array(9, $test_array);

push_array(10,$test_array);
push_array(11,$test_array);

push_array(12,$test_array);

push_array(13,$test_array);
push_array(14,$test_array);
push_array(15,$test_array);
push_array(16,$test_array);
push_array(17,$test_array);
push_array(18,$test_array);
push_array(19,$test_array);
push_array(20,$ test_array);
push_array(21,$test_array);
push_array(22,$test_array);
push_array(23,$test_array);
push_array(24,$test_array);
var_dump($test_array);exit;

Test results:

<span>array(12) {
  [0]=>
  int(24)
  [1]=>
  int(13)
  [2]=>
  int(14)
  [3]=>
  int(15)
  [4]=>
  int(16)
  [5]=>
  int(17)
  [6]=>
  int(18)
  [7]=>
  int(19)
  [8]=>
  int(20)
  [9]=>
  int(21)
  [10]=>
  int(22)
  [11]=>
  int(23)
}</span>

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In addition to each, the following array pointer function also works well

current() - returns the value of the current element in the array

end() - points the internal pointer to the last element in the array element, and output

next() - Point the internal pointer to the next element in the array, and output

prev() - Point the internal pointer to the previous element in the array, and output

reset() - Set the internal The pointer points to the first element in the array and outputs

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