来来来~把你第一眼看到的结果输出来~

This topic created in 2503 days ago, the information mentioned may be changed or developed.

<?php
$a = 0.7 - 0.4;
$b = 0.3;
echo 'gettype($a) = ' . gettype($a) . PHP_EOL;
echo 'gettype($b) = ' . gettype($b) . PHP_EOL;
echo '$a === $b ? ' . ($a === $b ? 'equal' : 'not equal') . PHP_EOL;

gettype

php_eol

echo

equal'

10 replies • 2020-01-03 09:03:23 +08:00

b821025551b

Jan 2, 2020

精度问题又拿出来了

eecjimmy

Jan 2, 2020

@b821025551b
哈哈~狗头~

eecjimmy

Jan 2, 2020

升级版本:
```php
<?php
$a = 0.7 - 0.4;
$b = 0.3;
$c = 0.29999999999999991111;
$d = 0.29999999999999992222;
$e = 0.29999999999999993333;
echo 'gettype($a) = ' . gettype($a) . PHP_EOL;
echo 'gettype($b) = ' . gettype($b) . PHP_EOL;
echo 'gettype($c) = ' . gettype($c) . PHP_EOL;
echo 'gettype($d) = ' . gettype($d) . PHP_EOL;
echo 'gettype($e) = ' . gettype($e) . PHP_EOL;
echo '$a === $b ? ' . ($a === $b ? 'equal' : 'not equal') . PHP_EOL;
echo '$a === $c ? ' . ($a === $c ? 'equal' : 'not equal') . PHP_EOL;
echo '$a === $d ? ' . ($a === $d ? 'equal' : 'not equal') . PHP_EOL;
echo '$a === $e ? ' . ($a === $e ? 'equal' : 'not equal') . PHP_EOL;
```