PHP filter_var() function_PHP tutorial
php tutorial filter introduction
php filters are used to validate and filter data from non-secure sources (such as user input).
Installation
The filter function is an integral part of the core of php. No installation is required to use these functions.
php filter function
php: indicates the earliest php version that supports this function.
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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