$large_number=2147483647;
var_dump($large_number; //int(2147483647 )。
$large_number=2147483648;
var_dump($large_number; //float(2147483648 )。
$million=1000000;
$large_number=50000 * $million;
var_dump($large_number; //float(5000000000 )。
?
$ large _ number=9223372036854775807;
var_dump($large_number; //int ) 9223372036854775807 )
$ large _ number=9223372036854775808;
var_dump($large_number; //float(9.2233720368548e18 )。
$million=1000000;
$ large _ number=500000000000 * $ million;
var_dump($large_number; //float(5.0e19 )。
?
注:如果系统为64位且php为32位,则最终将在32位系统上运行
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