PHP 类型转换函数intval
发布时间：2020-12-13 05:32:54 所属栏目：PHP教程 来源：网络整理
导读：PHP代码 $id = intval($_GET['id']); intval (PHP 4,PHP 5) intval — Get the integer value of a variable Description int intval ( mixed $var [,int $base= 10 ] ) Returns the integer value of var,using the specified base for the conversion (the
PHP代码 $id = intval($_GET['id']); intval (PHP 4,PHP 5) intval — Get the integer value of a variable Descriptionint intval ( mixed $var [,int $base= 10 ] ) Returns the integer value of var,using the specified base for the conversion (the default is base 10). Parameters var The scalar value being converted to an integer base The base for the conversion (default is base 10) Return Values The integer value of var on success,or 0 on failure. Empty arrays and objects return 0,non-empty arrays and objects return 1. The maximum value depends on the system. 32 bit systems have a maximum signed integer range of -2147483648 to 2147483647. So for example on such a system,intval('1000000000000') will return 2147483647. The maximum signed integer value for 64 bit systems is 9223372036854775807. Strings will most likely return 0 although this depends on the leftmost characters of the string. The common rules of integer casting apply. Examples 代码如下: echo intval(42); // 42 echo intval(4.2); // 4 echo intval('42'); // 42 echo intval('+42'); // 42 echo intval('-42'); // -42 echo intval(042); // 34 echo intval('042'); // 42 echo intval(1e10); // 1410065408 echo intval('1e10'); // 1 echo intval(0x1A); // 26 echo intval(42000000); // 42000000 echo intval(420000000000000000000); // 0 echo intval('420000000000000000000'); // 2147483647 echo intval(42,8); // 42 echo intval('42',8); // 34 ?> （编辑：李大同） 【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容! |