PHP Array Pointers Learning notes (i)

There is a problem with an array queue, the array length is fixed, and when an element is inserted into the input, the array auto-header begins to overwrite the fill after the maximum length is exceeded.

At this point, the entire array is formed into a ring. Such as.

Define an array

$test _array = Array ();
function Push_array ($value, & $test _array) {
if (count ($test _array) < 12) {

Add elements directly when the array is less than the specified length

$test _array[] = $value;
} else {

When the array is greater than the specified length, use each to remove the element of the current pointer and move the pointer down

List ($k, $v) = each ($test _array);

Generally use the modulus algorithm, get the key to be overwritten, and then directly overwrite it.

$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 (Ten, $test _array);
Push_array (one, $test _array);
Push_array ($test _array);
Push_array ($test _array);
Push_array ($test _array);
Push_array ($test _array);
Push_array ($test _array);
Push_array (n, $test _array);
Push_array ($test _array);
Push_array ($test _array);
Push_array ($test _array);
Push_array (+, $test _array);
Push_array ($test _array);
Push_array (at $test _array);
Push_array ($test _array);
Var_dump ($test _array); exit;

Test results:

Array (+) {  [0]=>  int ([1]=> int) [2]=> int (+)  [3]=>  Int (15)  [4]=>  Int (+)  [5]=>  Int (+)  [6]=>  Int ([7]=>)  Int (19)  [8]=>  int ([9]=> int  )  [10]=> Int (23)  [11]=>  int }

In addition to each, the following array pointer functions are also useful

• Current ()-Returns the value of the present element in the array
• End ()-Points the inner pointer to the last element in the array and outputs
• Next ()-Points the inner pointer to the next element in the array and outputs
• Prev ()-Points the internal pointer to the previous element in the array and outputs
• Reset ()-Points the inner pointer to the first element in the array and outputs

The above describes the PHP array pointer Learning notes (a), including aspects of the content, I hope that the PHP tutorial interested in a friend helpful.

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