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@ 2018-03-26T18:12:56Z

<?php

$strings = [
    "ABwerty45^&*jk",
    "ABwerrtty",
    "LF%$^erftgt5234",
    "TABYR56H",
    "ab7877",
    "Abtyu7"
];
$arr = ['AB', 'DC', 'LF'];

foreach ($strings as $string) {
    $match = in_array(substr($string, 0, 2), $arr);
    echo $match ? "Match: $string" . PHP_EOL : "No match: $string" . PHP_EOL;
}

Output
Performance
VLD
References
Branches

substr: documentation ( source)
in_array: documentation ( source)

preferences:dark modelive preview

66.71 ms | 402 KiB | 5 Q