(PHP 5 >= 5.1.0, PHP 7)
SplFileObject::__construct — Construct a new file object
$filename
[, string $open_mode = "r"
[, bool $use_include_path = FALSE
[, resource $context
]]] )Construct a new file object.
filenameThe file to read.
如已启用fopen 包装器，在此函数中， URL 可作为文件名。关于如何指定文件名详见 fopen()。各种 wapper 的不同功能请参见 支持的协议和封装协议，注意其用法及其可提供的预定义变量。
open_modeThe mode in which to open the file. See fopen() for a list of allowed modes.
use_include_path
Whether to search in the include_path for filename.
contextA valid context resource created with stream_context_create().
没有返回值。
Throws a RuntimeException if the filename cannot be opened.
Throws a LogicException if the filename is a directory.
Example #1 SplFileObject::__construct() example
This example opens the current file and iterates over its contents line by line.
<?php
$file = new SplFileObject(__FILE__);
foreach ($file as $line_num => $line) {
echo "Line $line_num is $line";
}
?>
以上例程的输出类似于：
Line 0 is <?php
Line 1 is $file = new SplFileObject(__FILE__);
Line 2 is foreach ($file as $line_num => $line) {
Line 3 is echo "Line $line_num is $line";
Line 4 is }
Line 5 is ?>