PHP Filter 简介
PHP 过滤器用于对来自非安全来源的数据(比如用户输入)进行验证和过滤。
安装
filter 函数是 PHP 核心的组成部分。无需安装即可使用这些函数。
PHP Filter 函数
PHP:指示支持该函数的最早的 PHP 版本。
filter_has_var() | 检查是否存在指定输入类型的变量。 | 5 |
filter_id() | 返回指定过滤器的 ID 号。 | 5 |
filter_input() | 从脚本外部获取输入,并进行过滤。 | 5 |
filter_input_array() | 从脚本外部获取多项输入,并进行过滤。 | 5 |
filter_list() | 返回包含所有得到支持的过滤器的一个数组。 | 5 |
filter_var_array() | 获取多项变量,并进行过滤。 | 5 |
filter_var() | 获取一个变量,并进行过滤。 | 5 |
PHP Filters
FILTER_CALLBACK | 调用用户自定义函数来过滤数据。 |
FILTER_SANITIZE_STRING | 去除标签,去除或编码特殊字符。 |
FILTER_SANITIZE_STRIPPED | "string" 过滤器的别名。 |
FILTER_SANITIZE_ENCODED | URL-encode 字符串,去除或编码特殊字符。 |
FILTER_SANITIZE_SPECIAL_CHARS | HTML 转义字符 '"& 以及 ASCII 值小于 32 的字符。 |
FILTER_SANITIZE_EMAIL | 删除所有字符,除了字母、数字以及 !#$%&'*+-/=?^_`{|}~@.[] |
FILTER_SANITIZE_URL | 删除所有字符,除了字母、数字以及 $-_.+!*'(),{}|\\^~[]`#%";/?:@&= |
FILTER_SANITIZE_NUMBER_INT | 删除所有字符,除了数字和 +- |
FILTER_SANITIZE_NUMBER_FLOAT | 删除所有字符,除了数字、+- 以及 .,eE。 |
FILTER_SANITIZE_MAGIC_QUOTES | 应用 addslashes()。 |
FILTER_UNSAFE_RAW | 不进行任何过滤,去除或编码特殊字符。 |
FILTER_VALIDATE_INT | 在指定的范围以整数验证值。 |
FILTER_VALIDATE_BOOLEAN | 如果是 "1", "true", "on" 以及 "yes",则返回 true,如果是 "0", "false", "off", "no" 以及 "",则返回 false。否则返回 NULL。 |
FILTER_VALIDATE_FLOAT | 以浮点数验证值。 |
FILTER_VALIDATE_REGEXP | 根据 regexp,兼容 Perl 的正则表达式来验证值。 |
FILTER_VALIDATE_URL | 把值作为 URL 来验证。 |
FILTER_VALIDATE_EMAIL | 把值作为 e-mail 来验证。 |
FILTER_VALIDATE_IP | 把值作为 IP 地址来验证。 |

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