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<?php
 
$arr = array("te", "sx", "ds");
 
$n = 6;
array_walk($arr, function($value) use (&$x, &$n) {$x[$n] = $value; $n++;});
print_r($x);

Success #stdin #stdout 0.01s 82880KB

stdin

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Standard input is empty

stdout

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Array
(
    [6] => te
    [7] => sx
    [8] => ds
)

https://ideone.com/ezF18B

language:

PHP (php 7.3.5)

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public

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