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php tutorial filter introduction
Installation
php filter function
php filters
Home Backend Development PHP Tutorial PHP filter_var() function_PHP tutorial

PHP filter_var() function_PHP tutorial

Jul 20, 2016 am 11:02 AM
filter php var function Safety right Tutorial data source of Introduction filter No

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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