8734a9a4af
If add more than a certain number of times, it will overflow, so need to adjust the digits before adding.
36 lines
616 B
PHP
36 lines
616 B
PHP
--TEST--
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bcmul() checking overflow
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--EXTENSIONS--
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bcmath
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--INI--
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bcmath.scale=0
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--FILE--
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<?php
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for ($i = 1; $i < 15; $i++) {
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$repeat = 2 ** $i;
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$num1 = str_repeat('99999999', $repeat);
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/*
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* 9999 * 9999 = 99980001
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* 99999999 * 99999999 = 9999999800000001
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*/
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$expected = str_repeat('9', $repeat * 8 - 1) . '8' . str_repeat('0', $repeat * 8 - 1) . '1';
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$actual = bcmul($num1, $num1);
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echo $repeat . ': ' . ($actual === $expected ? 'OK' : 'NG') . PHP_EOL;
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}
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?>
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--EXPECT--
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2: OK
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4: OK
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8: OK
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16: OK
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32: OK
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64: OK
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128: OK
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256: OK
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512: OK
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1024: OK
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2048: OK
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4096: OK
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8192: OK
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16384: OK
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