Array_slice function usage example in PHP, array_slice instance _ PHP Tutorial

For example, array_slice function usage in PHP. The array_slice function usage examples in PHP are described in detail. the array_slice instance describes the detailed usage of the array_slice function and some common array_slice instance programs, array_slice instance

This article describes in detail the usage of the array_slice function and some common array_slice instance programs for your reference. The specific analysis is as follows:

The array_slice () function extracts a value from the array based on the conditions and returns the result.

Note: If the array has a string key, the returned array retains the key name. See Example 4.

Syntax: array_slice (array, offset, length, preserve)

The function extracts a value from the array based on the conditions and returns the result.

Parameters:

Array required. specifies the input array.

Offset is required. it is a numerical value that specifies the start position of the retrieved element. if it is a positive number, it is obtained from the beginning to the end. if it is a negative value, it is taken from the end to the absolute value of the offset.

Length (optional) value. specify the length of the returned array. if it is a negative number, select the element with the absolute value from the back to the front. if this value is not set, all elements are returned.

Optional. value options: true-retain key false-default-reset key. when the value is 0, assign the value to a new variable and return 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"
";
$ Arr2 = array ('a' => array ('A', 'A', 'A'), 'B' => array ('B', 'B ', 'B '));
Var_dump (array_slice ($ arr2, 0, 1 ));
?>

The returned results 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) ""}}

The paging method implemented by the array_slice function is very easy to use. The following is an example:

The code is as follows:

<? Php
// Assume a two-dimensional array of the result set:
$ 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' => 'job1 '),
Array ('name' => 'name5', 'sex' => 'sex5 ', 'job' => 'job5 '),
Array ('name' => 'name6', 'sex' => 'sex6', 'job' => 'job1 '),
Array ('name' => 'name7', 'sex' => 'sex7', 'job' => 'job2 '),
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' => 'job2 '),
);

// Calculate the total number of records
$ Num = count ($ arr );
// Specify the number of entries displayed on each page
$ Perpage = 3;
// Calculate the page number
$ 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;
?>

<? PhpForeach ($ 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 "homepage ";
Echo "previous page ";
}
If ($ page <$ pages)
{
Echo "next page ";
Echo "last page ";
}
?>

I hope this article will help you with PHP programming.

This article describes the usage of array_slice functions and some common array_slice instance programs...