SplFileObject::seek

(PHP 5 >= 5.1.0, PHP 7, PHP 8)

SplFileObject::seekSeek to specified line

Descrizione

public SplFileObject::seek(int $line): void

Seek to specified line in the file.

Elenco dei parametri

line

The zero-based line number to seek to.

Valori restituiti

Nessun valore viene restituito.

Errori/Eccezioni

Throws a LogicException if the line is negative.

Esempi

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();
?>

Il precedente esempio visualizzerà qualcosa simile a:

$file->seek(2);

Vedere anche:

add a note

User Contributed Notes 2 notes

up
13
info at inatica dot com
3 years ago
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);
}
}
}
?>
up
-1
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;
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