is_readable

(PHP 4, PHP 5, PHP 7)

is_readable — Tells whether a file exists and is readable

설명

bool is_readable ( string $filename )

Tells whether a file exists and is readable.

인수

filename: Path to the file.

반환값

Returns TRUE if the file or directory specified by filename exists and is readable, FALSE otherwise.

예제

Example #1 is_readable() example


<?php
$filename = 'test.txt';
if (is_readable($filename)) {
    echo 'The file is readable';
} else {
    echo 'The file is not readable';
}
?>

오류/예외

실패 시, E_WARNING이 발생합니다.

주의

Keep in mind that PHP may be accessing the file as the user id that the web server runs as (often 'nobody'). Safe mode limitations are not taken into account before PHP 5.1.5.

Note: 이 함수의 결과는 캐시에 저장합니다. 자세한 설명은 clearstatcache()를 참고하십시오.

Tip

PHP 5.0.0부터 이 함수는 몇몇 URL 래퍼를 사용할 수 있습니다. 기능적으로 stat() 패밀리를 지원하는 래퍼 목록은 Supported Protocols and Wrappers를 참고하십시오.

Note:
The check is done using the real UID/GID instead of the effective one.

This function may return TRUE for directories. Use is_dir() to distinguish file and directory.

참고

is_writable() - Tells whether the filename is writable
file_exists() - Checks whether a file or directory exists
fgets() - Gets line from file pointer