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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 8.1.2 - 8.1.33, 8.2.10 - 8.2.29, 8.3.0 - 8.3.28, 8.4.1 - 8.4.14, 8.5.0: 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
Output for 8.4.15: /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.

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