PHP unset,array_splice Remove the difference between elements in an array, unsetarray_splice_php tutorial

PHP Unset,array_splice Removes the difference between elements in an array, Unsetarray_splice

If you want to delete an element in an array, you can use the unset directly, but the index of the array does not reflow:

<?php $arr = Array (' A ', ' B ', ' C ', ' d '); unset ($arr [1]);p Rint_r ($arr);? >

The result is:

Array ([0] = a [2] = c [3] = + D)

So how can the missing elements be filled and the array will be re-indexed? The answer is Array_splice ():

<?php $arr = Array (' A ', ' B ', ' C ', ' d '); Array_splice ($arr, 1, 1); Print_r ($arr);?>

The result is:

Array ([0] = a [1] = c [2] = + D)

Delete a specific element in an array

<?PHP$ARR2 = Array (1,3, 5,7,8), foreach ($arr 2 as $key = + $value) {  if ($value = = = 3)    

Supplemental Delete Empty Array

Instance:

<?php $array = (' a ' + = ' abc ', ' B ' + = ' bcd ', ' c ' = ' CDE ', ' d ' = ' def ', ' e ' = ' = ') ';  Array_filter ($array); echo "
";  Print_r ($array);? >

Results:
Array (
[A] = ABC
[B] = BCD
[C] = CDE
[d] = def
)
Summarize
If the Array_splice () function is deleted, the index value of the array also changes.
If the unset () function is removed, the index value of the array does not change.

What is the difference between unset and Array_pop in PHP?
Unset can delete all the variables, Array_pop only for array operations, only the last element of the array is popped, unset can delete any element in the array

PHP deletes the elements in an array
Do not know the classmate know array_slice this function?
$arr = Array_slice ($arr, 0, 3);
You can do it.
Array_slice () The first parameter is the array to be cut, the second argument is the starting position, and the third parameter is the length.
is to cut $arr this array, from the No. 0 element back to the number of 3.
Array_slice usage is flexible, can support negative parameters, you can view the PHP manual.
cn.php.net/manual/en/function.range.php

http://www.bkjia.com/PHPjc/851336.html www.bkjia.com true http://www.bkjia.com/PHPjc/851336.html techarticle php unset,array_splice Remove the difference between the elements in an array, unsetarray_splice if you want to delete an element in an array, you can use the unset directly, but the index of the array does not reflow ...
