there is a bug using fseek on previos versions of PHP8.0.1
See:
https://bugs.php.net/bug.php?id=46569
https://3v4l.org/O89dJ
I solved it with a function:
<?php
/**
* SEEK an Spl object
* There is a bug in php for seeking files
* seems solved php_version > PHP8.0.1
* See https://bugs.php.net/bug.php?id=46569
* & https://3v4l.org/O89dJ
*
* $Spl->seek() Works ok in all versions with offset 0 (first row)
* On PHP_VERSION < 8.0.1:
* - Offset 1: seek() cannot seek at row 1. It will be done manually, rewind file and reading first row
* - Rest of Offsets: The cursor remains at next row of $Offset
*
* @param SplObject $Spl
* @param int $Offset
*/
function seek_spl($Spl, $Offset){
if (version_compare(PHP_VERSION, '8.0.1', '>=') || $Offset == 0) {
$Spl->seek($Offset);
} else {
if( $Offset == 1 ){
$Spl->rewind(); // Ensure to go at first row before exit
$Spl->fgets(); // Read line 0. Cursor remains now at line 1
} else {
$Spl->seek($Offset-1);
}
}
}?>
SplFileObject::seek
(PHP 5 >= 5.1.0, PHP 7)
SplFileObject::seek — Seek to specified line
Descrierea
public SplFileObject::seek
( int
$line_pos
) : voidSeek to specified line in the file.
Parametri
-
line_pos -
The zero-based line number to seek to.
Valorile întoarse
Nu este întoarsă nici o valoare.
Erori/Excepții
Throws a LogicException if the
line_pos is negative.
Exemple
Example #1 SplFileObject::seek() example
This example outputs the third line of the script which is found at position 2.
<?php
$file = new SplFileObject(__FILE__);
$file->seek(2);
echo $file->current();
?>
Exemplul de mai sus va afișa ceva similar cu:
$file->seek(2);
A se vedea și
- SplFileObject::current() - Retrieve current line of file
- SplFileObject::key() - Get line number
- SplFileObject::next() - Read next line
- SplFileObject::rewind() - Rewind the file to the first line
- SplFileObject::valid() - Not at EOF
add a note
User Contributed Notes 2 notes
info at inatica dot com ¶
3 years ago
ahmad_maqsood at waku-2 dot com ¶
7 years ago
A sleek way of counting the number of lines in a file can be like below
$file = new \SplFileObject('file.extension', 'r');
$file->seek(PHP_INT_MAX);
echo $file->key() + 1;
