ctype_xdigit
소개
Variable and Type Related Extensions
PHP Manual

# Data Filtering

- 소개
- 설치/설정
  - 요구 조건
  - 설치
  - 실행시 설정
  - 자원형
- Types of filters
  - Validate filters
  - Sanitize filters
  - Other filters
- 예약 상수
- 예제
  - Validation
  - Sanitization
- Filter 함수 목록
  - filter_has_var — Checks if variable of specified type exists
  - filter_id — Returns the filter ID belonging to a named filter
  - filter_input_array — Gets external variables and optionally filters them
  - filter_input — Gets a specific external variable by name and optionally filters it
  - filter_list — Returns a list of all supported filters
  - filter_var_array — Gets multiple variables and optionally filters them
  - filter_var — Filters a variable with a specified filter

ctype_xdigit
소개
Variable and Type Related Extensions
PHP Manual