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<?php
 
$arr = array("arif", "arin", "asif", "armin", "arpan");
$newar = preg_grep('|^ar|', $arr);
print_r(array_keys($newar));

Success #stdin #stdout 0.01s 52488KB

stdin

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Standard input is empty

stdout

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Array
(
    [0] => 0
    [1] => 1
    [2] => 3
    [3] => 4
)

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