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@ 2022-02-07T17:01:33Z

<?php
$tests = array(
    'empty array'              => array(),
    'consecutive from 0'       => array(
        0 => 'one',
        1 => 'two',
    ),
    'consecutive from 0 float' => array(
        0.0 => 'one',
        1.0 => 'two',
    ),
    'consecutive from 0 str'   => array(
        '0' => 'one',
        '1' => 'two',
    ),
    'consecutive from 1'       => array(
        1 => 'one',
        2 => 'two',
    ),
    'consecutive from 1 float' => array(
        1.0 => 'one',
        2.0 => 'two',
    ),
    'consecutive from 1 str'   => array(
        '1' => 'one',
        '2' => 'two',
    ),
    'non-consecutive int'      => array(
        1 => 'one',
        0 => 'two',
    ),
    'non-consecutive float'    => array(
        1.0 => 'one',
        0.0 => 'two',
    ),
    'non-consecutive string'   => array(
        '1' => 'one',
        '0' => 'two',
    ),
);

foreach ( $tests as $test => $arr ) {
    echo str_pad( $test, 30 ), var_export( array_is_list( $arr ), true ), PHP_EOL;
}

Output for git.master, git.master_jit, rfc.property-hooks: empty array true consecutive from 0 true consecutive from 0 float true consecutive from 0 str true consecutive from 1 false consecutive from 1 float false consecutive from 1 str false non-consecutive int false non-consecutive float false non-consecutive string false

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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