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@ 2020-11-19T08:16:53Z

<?php

$arr = [
        '', 3445, '', 3446, '', 3452, '', 3530, 3555,
];

$str = serialize($arr);
echo $str; // a:9:{i:0;s:0:"";i:1;i:3445;i:2;s:0:"";i:3;i:3446;i:4;s:0:"";i:5;i:3452;i:6;s:0:"";i:7;i:3530;i:8;i:3555;}
echo PHP_EOL;

$arr = unserialize($str);
print_r($arr); // Array ( [0] => [1] => 3445 [2] => [3] => 3446 [4] => [5] => 3452 [6] => [7] => 3530 [8] => 3555 )
echo PHP_EOL;

$arrayLen = count($arr);
echo 'array length : ' . $arrayLen; // 9
echo PHP_EOL;

// return index of value
$needle = 3452;
$index = array_search($needle, $arr);
echo 'found value ' . $needle . ' at index : ' . $index; // found value 3452 at index 5
echo PHP_EOL;

// Count only non empty array entries
$arrNonEmpty = array_filter($arr, function($element) { return !empty($element); });
$count = count($arrNonEmpty);
echo 'non empty values in array : ' . $count;
echo PHP_EOL;

print_r($arrNonEmpty);

// rebase array indices
$arrNonEmpty = array_values($arrNonEmpty);
echo 'rebased indices:' . PHP_EOL;

print_r($arrNonEmpty);

Output for git.master, git.master_jit, rfc.property-hooks: a:9:{i:0;s:0:"";i:1;i:3445;i:2;s:0:"";i:3;i:3446;i:4;s:0:"";i:5;i:3452;i:6;s:0:"";i:7;i:3530;i:8;i:3555;} Array ( [0] => [1] => 3445 [2] => [3] => 3446 [4] => [5] => 3452 [6] => [7] => 3530 [8] => 3555 ) array length : 9 found value 3452 at index : 5 non empty values in array : 5 Array ( [1] => 3445 [3] => 3446 [5] => 3452 [7] => 3530 [8] => 3555 ) rebased indices: Array ( [0] => 3445 [1] => 3446 [2] => 3452 [3] => 3530 [4] => 3555 )

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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