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(PHP 5 >= 5.1.0)
SplFileObject::key — Get line number
Gets the current line number.
Note:
This number may not reflect the actual line number in the file if SplFileObject::setMaxLineLen() is used to read fixed lengths of the file.
此函数没有参数。
Returns the current line number.
Example #1 SplFileObject::key() example
  <?php
$file  = new  SplFileObject ( "lipsum.txt" );
foreach ( $file  as  $line ) {
    echo  $file -> key () .  ". "  .  $line ;
}
 ?>   以上例程的输出类似于:
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.
Example #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" ;
}
 ?>   以上例程的输出类似于:
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.