How to use PHP pagination in array's - php

Question

Since I am trying to learn more about PHP I would like to add Pagination to array's
I have a JSON output that I can read and echo via a foreach. But I am not able to show 10 or 20 records.
I have used the code from this page:
But I miss the place where I can store the echo for the array.
$persons = '[
{"FrstName":"Henry","Middlename":"","LastName":"Walton","Online":true,"DeptId":"4"},
{"FrstName":"Klaus","Middlename":"","LastName":"Mikaelson","Online":true,"DeptId":"2"},
{"FrstName":"Kylo","Middlename":"","LastName":"Ren","Online":false,"DeptId":"4"},
{"FrstName":"Stan","Middlename":"","LastName":"Lee","Online":false,"DeptId":"3"},
{"FrstName":"Kevin","Middlename":"","LastName":"McNally","Online":false,"DeptId":"3"},
{"FrstName":"Katherine","Middlename":"","LastName":"Pierce","Online":false,"DeptId":"2"},
{"FrstName":"Clint","Middlename":"","LastName":"Barton","Online":true,"DeptId":"3"},
{"FrstName":"Avery","Middlename":"","LastName":"Walton","Online":true,"DeptId":"4"},
{"FrstName":"Peter","Middlename":"","LastName":"Kap","Online":true,"DeptId":"2"},
{"FrstName":"Denzo","Middlename":"","LastName":"Falc","Online":false,"DeptId":"4"},
{"FrstName":"Eveline","Middlename":"","LastName":"Benzel","Online":false,"DeptId":"3"},
{"FrstName":"Bill","Middlename":"","LastName":"Libuz","Online":false,"DeptId":"3"},
{"FrstName":"April","Middlename":"","LastName":"Gonzo","Online":false,"DeptId":"2"},
{"FrstName":"Harry","Middlename":"","LastName":"Geraldson","Online":true,"DeptId":"3"},
{"FrstName":"Heraldson","Middlename":"","LastName":"McGree","Online":false,"DeptId":"3"}
{"FrstName":"Abraham","Middlename":"","LastName":"Retz","Online":true,"DeptId":"4"},
{"FrstName":"June","Middlename":"","LastName":"Pharee","Online":true,"DeptId":"2"},
{"FrstName":"Anthony","Middlename":"","LastName":"Gonzales","Online":false,"DeptId":"4"},
{"FrstName":"Billy","Middlename":"","LastName":"Scott","Online":false,"DeptId":"3"},
{"FrstName":"Anika","Middlename":"","LastName":"Rose","Online":false,"DeptId":"3"},
{"FrstName":"Kristen","Middlename":"","LastName":"Fontana","Online":false,"DeptId":"2"},
{"FrstName":"Olivia","Middlename":"","LastName":"Menzel","Online":true,"DeptId":"3"},
{"FrstName":"Mark","Middlename":"van","LastName":"Gad","Online":false,"DeptId":"3"}
{"FrstName":"Hope","Middlename":"van","LastName":"Dyne","Online":false,"DeptId":"3"}
]';
$page = ! empty( $_GET['page'] ) ? (int) $_GET['page'] : 1;
$total = count( $persons ); //total items in array
$limit = 10; //per page
$totalPages = ceil( $total/ $limit ); //calculate total pages
$page = max($page, 1); //get 1 page when $_GET['page'] <= 0
$page = min($page, $totalPages); //get last page when $_GET['page'] > $totalPages
$offset = ($page - 1) * $limit;
if( $offset < 0 ) $offset = 0;
$yourDataArray = array_slice( $persons, $offset, $limit );
$link = 'index.php?page=%d';
$pagerContainer = '<div style="width: 300px;">';
if( $totalPages != 0 )
{
if( $page == 1 )
{
$pagerContainer .= '';
}
else
{
$pagerContainer .= sprintf( ' « prev page', $page - 1 );
}
$pagerContainer .= ' <span> page <strong>' . $page . '</strong> from ' . $totalPages . '</span>';
if( $page == $totalPages )
{
$pagerContainer .= '';
}
else
{
$pagerContainer .= sprintf( ' next page » ', $page + 1 );
}
}
$pagerContainer .= '</div>';
echo $pagerContainer;
I would like to know how I can fix this to use pagination for my array.

Answer 1

You need to json_decode() your JSON first to access array methods (count(), array_slice()). Also, your JSON data was invalid, missing some commas, fixed that.
<?php
$persons = '[
{"FrstName":"Henry","Middlename":"","LastName":"Walton","Online":true,"DeptId":"4"},
{"FrstName":"Klaus","Middlename":"","LastName":"Mikaelson","Online":true,"DeptId":"2"},
{"FrstName":"Kylo","Middlename":"","LastName":"Ren","Online":false,"DeptId":"4"},
{"FrstName":"Stan","Middlename":"","LastName":"Lee","Online":false,"DeptId":"3"},
{"FrstName":"Kevin","Middlename":"","LastName":"McNally","Online":false,"DeptId":"3"},
{"FrstName":"Katherine","Middlename":"","LastName":"Pierce","Online":false,"DeptId":"2"},
{"FrstName":"Clint","Middlename":"","LastName":"Barton","Online":true,"DeptId":"3"},
{"FrstName":"Avery","Middlename":"","LastName":"Walton","Online":true,"DeptId":"4"},
{"FrstName":"Peter","Middlename":"","LastName":"Kap","Online":true,"DeptId":"2"},
{"FrstName":"Denzo","Middlename":"","LastName":"Falc","Online":false,"DeptId":"4"},
{"FrstName":"Eveline","Middlename":"","LastName":"Benzel","Online":false,"DeptId":"3"},
{"FrstName":"Bill","Middlename":"","LastName":"Libuz","Online":false,"DeptId":"3"},
{"FrstName":"April","Middlename":"","LastName":"Gonzo","Online":false,"DeptId":"2"},
{"FrstName":"Harry","Middlename":"","LastName":"Geraldson","Online":true,"DeptId":"3"},
{"FrstName":"Heraldson","Middlename":"","LastName":"McGree","Online":false,"DeptId":"3"},
{"FrstName":"Abraham","Middlename":"","LastName":"Retz","Online":true,"DeptId":"4"},
{"FrstName":"June","Middlename":"","LastName":"Pharee","Online":true,"DeptId":"2"},
{"FrstName":"Anthony","Middlename":"","LastName":"Gonzales","Online":false,"DeptId":"4"},
{"FrstName":"Billy","Middlename":"","LastName":"Scott","Online":false,"DeptId":"3"},
{"FrstName":"Anika","Middlename":"","LastName":"Rose","Online":false,"DeptId":"3"},
{"FrstName":"Kristen","Middlename":"","LastName":"Fontana","Online":false,"DeptId":"2"},
{"FrstName":"Olivia","Middlename":"","LastName":"Menzel","Online":true,"DeptId":"3"},
{"FrstName":"Mark","Middlename":"van","LastName":"Gad","Online":false,"DeptId":"3"},
{"FrstName":"Hope","Middlename":"van","LastName":"Dyne","Online":false,"DeptId":"3"}
]';
// Make the JSON an array, so count() and array_slice() work
$persons = json_decode($persons, true);
$page = ! empty( $_GET['page'] ) ? (int) $_GET['page'] : 1;
$total = count( $persons ); //total items in array
// $limit = 10; //per page
// Set limit to 3 for testing:
$limit = 3;
$totalPages = ceil( $total/ $limit ); //calculate total pages
$page = max($page, 1); //get 1 page when $_GET['page'] <= 0
$page = min($page, $totalPages); //get last page when $_GET['page'] > $totalPages
// Uncomment this for testing
// $page = 2;
$offset = ($page - 1) * $limit;
if( $offset < 0 ) $offset = 0;
$yourDataArray = array_slice( $persons, $offset, $limit );
$link = 'index.php?page=%d';
$pagerContainer = '<div style="width: 300px;">';
if( $totalPages != 0 )
{
if( $page == 1 )
{
$pagerContainer .= '';
}
else
{
$pagerContainer .= sprintf( ' « prev page', $page - 1 );
}
$pagerContainer .= ' <span> page <strong>' . $page . '</strong> from ' . $totalPages . '</span>';
if( $page == $totalPages )
{
$pagerContainer .= '';
}
else
{
$pagerContainer .= sprintf( ' next page » ', $page + 1 );
}
}
$pagerContainer .= '</div>';
echo $pagerContainer;
foreach($yourDataArray as $person) {
echo "\n";
echo "First name: " . $person['FrstName'];
echo " - Middle name: " . $person['Middlename'];
echo " - Last name: " . $person['LastName'];
echo " - Online: " . $person['Online'];
echo " - Dept: " . $person['DeptId'];
}
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