fgets
(PHP 4, PHP 5)
fgets — Gets line from file pointer
說明
Gets a line from file pointer.
參數
- handle
-
檔案指標必須有效，並且必須指向一個由 fopen() 或 fsockopen() 成功打開（但還沒有被 fclose() 關閉）的檔案。
- length
-
Reading ends when length - 1 bytes have been read, on a newline (which is included in the return value), or on EOF (whichever comes first). If no length is specified, it will keep reading from the stream until it reaches the end of the line.
Note: Until PHP 4.3.0, omitting it would assume 1024 as the line length. If the majority of the lines in the file are all larger than 8KB, it is more resource efficient for your script to specify the maximum line length.
Return值
Returns a string of up to length - 1 bytes read from the file pointed to by handle .
If an error occurs, returns FALSE.
更新日誌
| 版本 | 說明 |
|---|---|
| 4.3.0 | fgets() is now binary safe |
| 4.2.0 | The length parameter became optional |
範例
Example#1 Reading a file line by line
<?php
$handle = @fopen("/tmp/inputfile.txt", "r");
if ($handle) {
while (!feof($handle)) {
$buffer = fgets($handle, 4096);
echo $buffer;
}
fclose($handle);
}
?>
註釋
Note: 如果碰到 PHP 在讀取文件時不能識別 Macintosh 文件的換行字元，可以開啟 auto_detect_line_endings 執行時期設定選項。
Note: People used to the 'C' semantics of fgets() should note the difference in how EOF is returned.