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<?php $strings = [ '100010' => '110', '010200' => '1200', '01110' => '1110', ]; foreach ($strings as $subject => $expected) { $actual = preg_replace('/0(?=^)/', '', $subject); printf(" %s -> %s (expected: %s)\n", $subject, $actual, $expected); }

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37.03 ms | 402 KiB | 5 Q