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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。

函数 描述 PHP
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

ID 名称 描述
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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