PHP Array_slice Function Usage example detailed _php

In this paper, the detailed usage of the Array_slice function and some common Array_slice instance programs are introduced in detail, which are shared for everyone's reference. The specific analysis is as follows:

The Array_slice () function takes a value out of the array and returns it as a condition.

Note: If the array has a string key, the returned array will retain the key name, see Example 4.

Syntax: Array_slice (Array,offset,length,preserve)

The function takes a value out of the array and returns it as a condition.

Parameters:

Array required, which specifies the input arrays.

Offset required, numeric, specifies the starting position of the element to be removed, if it is a positive number, the previous start to take, if a negative value, from the back forward to the absolute value.

The length is optional, the value is specified, and if it is a negative number, the element that has the absolute value of the values is selected, and if the value is not set, all elements are returned.

Preserve optional, possible value: true – Reserved key false– default – Resets the key, when it is 0, assigns the value inside to a new variable, and finally returns the variable.

The code is as follows:

The code is as follows:

<?php
$arr = Array (0,1,2,3,4);
Var_dump (Array_slice ($arr, 0,2));

echo "
";
$arr 2 = Array (' A ' =>array (' A ', ' a ', ' a '), ' B ' =>array (' B ', ' B ', ' B '));
Var_dump (Array_slice ($arr 2,0,1));
?>

The results returned are as follows:
Array (2) {[0]=> int (0) [1]=> int (1)}
Array (1) {["A"]=> Array (3) {[0]=> string (1) "A" [1]=> string (1) "A" [2]=> string (1) "A"}}

The paging method implemented by the Array_slice function is very useful and is shared as follows:

The code is as follows:

<?php
Assume a two-dimensional array of result sets:
$arr = Array (' name ' = ' name1 ', ' sex ' = ' sex1 ', ' job ' = ' job1 '),
Array (' name ' = ' name2 ', ' sex ' = ' sex2 ', ' job ' = ' job2 '),
Array (' name ' = ' name3 ', ' sex ' = ' sex3 ', ' job ' = ' job3 '),
Array (' name ' = ' name4 ', ' sex ' = ' sex4 ', ' job ' = ' job4 '),
Array (' name ' = ' name5 ', ' sex ' = ' sex5 ', ' job ' = ' job5 '),
Array (' name ' = ' name6 ', ' sex ' = ' sex6 ', ' job ' = ' job6 '),
Array (' name ' = ' name7 ', ' sex ' = ' sex7 ', ' job ' = ' job7 '),
Array (' name ' = ' name8 ', ' sex ' = ' sex8 ', ' job ' = ' job8 '),
Array (' name ' = ' name9 ', ' sex ' = ' sex9 ', ' job ' = ' job9 '),
Array (' name ' = ' name10 ', ' sex ' = ' sex10 ', ' job ' = ' job10 '),
Array (' name ' = ' name11 ', ' sex ' = ' sex11 ', ' job ' = ' job11 '),
Array (' name ' = ' name12 ', ' sex ' = ' sex12 ', ' job ' = ' job12 '),
);

Calculate total number of records
$num = count ($arr);
Specify the number of bars to display per page
$perpage = 3;
Count pages
$pages = Ceil ($num/$perpage);
Echo $num, $perpage, $pagecount; exit;
if (Is_numeric ($_request[' page '))
{
if ($_request[' page ']<1) {
$page = 1;
}elseif ($_request[' page ']> $pages)
{
$page = $pages;
}else{
$page = $_request[' page '];
}
}else{
$page = 1;
}
$start = ($page-1) * $perpage;
$newpage = Array_slice ($arr, $start, $perpage, true);
Print_r ($newpage); exit;
?>

<?php foreach ($newpage as $k = = $v) {?> <?php}?>

Name	Sex	Job
<?php echo $v [' name '];?>	<?php echo $v [' sex '];?>	<?php echo $v [' job '];?>

<?php
if ($page >1) {
echo "Home";
echo "";
echo "Last";
}
?>

I hope this article is helpful to everyone's PHP programming.

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