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<?php
 
$array = ["a", "b", "c", "d", "f"];
$suffixed_array = preg_filter('/$/', '_M', $array);
print_r($suffixed_array);

Success #stdin #stdout 0.01s 83328KB

stdin

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Standard input is empty

stdout

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Array
(
    [0] => a_M
    [1] => b_M
    [2] => c_M
    [3] => d_M
    [4] => f_M
)

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