SplFileObject::hasChildren
SplFileObject::next
SplFileObject
PHP Manual

# SplFileObject::key

(PHP 5 >= 5.1.0)

SplFileObject::key — Get line number

### 説明

public int SplFileObject::key ( void )

Gets the current line number.

> 注意: This number may not reflect the actual line number in the file if SplFileObject::setMaxLineLen is used to read fixed lengths of the file.

### パラメータ

この関数にはパラメータはありません。

### 返り値

Returns the current line number.

### 例

例1 SplFileObject::key example

`<?php
$file = new SplFileObject("lipsum.txt");
foreach ($file as $line) {
echo $file->key() . ". " . $line;
}
?>`

上の例の出力は、 たとえば以下のようになります。

    0. Lorem ipsum dolor sit amet, consectetur adipiscing elit.
    1. Duis nec sapien felis, ac sodales nisl.
    2. Lorem ipsum dolor sit amet, consectetur adipiscing elit.

例2 SplFileObject::key example with SplFileObject::setMaxLineLen

`<?php
$file = new SplFileObject("lipsum.txt");
$file->setMaxLineLen(20);
foreach ($file as $line) {
echo $file->key() . ". " . $line . "\n";
}
?>`

上の例の出力は、 たとえば以下のようになります。

    0. Lorem ipsum dolor s
    1. it amet, consectetu
    2. r adipiscing elit.
    3.

    4. Duis nec sapien fel
    5. is, ac sodales nisl
    6. .

    7. Lorem ipsum dolor s
    8. it amet, consectetu
    9. r adipiscing elit.

### 参考

- SplFileObject::current - Retrieve current line of file
- SplFileObject::seek - Seek to specified line
- SplFileObject::next - Read next line
- SplFileObject::rewind - Rewind the file to the first line
- SplFileObject::valid - Not at EOF

SplFileObject::hasChildren
SplFileObject::next
SplFileObject
PHP Manual