22 lines
410 B
PHP
22 lines
410 B
PHP
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<?php
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function day4(int $part = 1) {
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$key = 'bgvyzdsv';
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$stop_value = 0;
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for ($i = 0; $i < 10000000; $i++) {
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$stop_value = $key . $i;
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$md5 = md5($stop_value);
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if ($part == 1) {
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$identifier = '00000';
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}
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elseif ($part == 2) {
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$identifier = '000000';
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}
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if (str_starts_with($md5, $identifier)) {
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break;
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}
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}
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return str_replace($key, '', $stop_value);
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}
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