Cancellare le prime 3 righe di un file

[max_400]

Sintetico e veloce come faccio a cancellare le prime 3 righe o piu di 3 di un file (.txt. html .php)

Ho creato una chat e ogni volta che un utente si collega viene inviato l'orario ogni minuto circa
però ovviamente l'elenco diventa troppo lungo come faccio a cancellare le prime righe che non mi interessano?Per esempio oggi è martedi devo cancellare le righe di ieri magari qualkosa che legge la parola Monday e cancella la righe relativa voi che siete bravi di php.


- Monday, 22 September 2014 - 11:40
- Monday, 22 September 2014 - 20:18
- Monday, 22 September 2014 - 20:21
- Monday, 22 September 2014 - 20:24
- Monday, 22 September 2014 - 20:25
- Monday, 22 September 2014 - 20:26
- Monday, 22 September 2014 - 20:27
- Monday, 22 September 2014 - 20:31
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- Monday, 22 September 2014 - 20:40
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- Monday, 22 September 2014 - 20:45
- Monday, 22 September 2014 - 21:01
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- Monday, 22 September 2014 - 21:05
- Monday, 22 September 2014 - 21:14
- Monday, 22 September 2014 - 21:23
- Monday, 22 September 2014 - 21:27
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- Monday, 22 September 2014 - 21:31
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- Monday, 22 September 2014 - 21:33
- Monday, 22 September 2014 - 21:34
- Monday, 22 September 2014 - 21:35
- Monday, 22 September 2014 - 21:36
- Monday, 22 September 2014 - 21:37
- Monday, 22 September 2014 - 21:38
- Monday, 22 September 2014 - 21:40
- Monday, 22 September 2014 - 21:41
- Monday, 22 September 2014 - 21:42
- Monday, 22 September 2014 - 21:43
- Monday, 22 September 2014 - 21:44
- Monday, 22 September 2014 - 21:45
- Monday, 22 September 2014 - 21:46
- Monday, 22 September 2014 - 21:47
- Monday, 22 September 2014 - 21:48
- Monday, 22 September 2014 - 21:49
- Monday, 22 September 2014 - 21:51
- Monday, 22 September 2014 - 21:51
- Monday, 22 September 2014 - 21:53
- Monday, 22 September 2014 - 21:53
- Monday, 22 September 2014 - 21:55
- Monday, 22 September 2014 - 21:56
- Monday, 22 September 2014 - 21:58
- Monday, 22 September 2014 - 22:01
- Monday, 22 September 2014 - 22:03
- Monday, 22 September 2014 - 22:04
- Monday, 22 September 2014 - 22:05
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- Monday, 22 September 2014 - 22:15
- Monday, 22 September 2014 - 22:19
- Monday, 22 September 2014 - 22:20
- Monday, 22 September 2014 - 22:29
- Monday, 22 September 2014 - 22:30
- Monday, 22 September 2014 - 22:31
- Monday, 22 September 2014 - 22:38
- Monday, 22 September 2014 - 22:39
- Monday, 22 September 2014 - 22:40
- Monday, 22 September 2014 - 22:42
- Monday, 22 September 2014 - 23:23
- Monday, 22 September 2014 - 23:24
- Tuesday, 23 September 2014 - 10:04
- Tuesday, 23 September 2014 - 10:09
- Tuesday, 23 September 2014 - 13:32
- Tuesday, 23 September 2014 - 14:01
- Tuesday, 23 September 2014 - 14:15


grazie

 

[criric]

Ciao Max
apri due volte il file, una volta in lettura, cerchi il giorno e prepari una stringa, una volta in scrittura e sovrascrivi

<?php

$oggi = date("l");
$file = "file.txt";

$fr = fopen($file, 'r');
$nuovo = "";
while (!feof($fr)) {
    $riga = fgets($fr);
    if (strpos($riga, $oggi) !== false) {
        $nuovo .= $riga;
    }
}
fclose($fr);

$fr = fopen($file, 'w');
fwrite($fr, $nuovo);
fclose($fr);
?>

 

[max_400]

grazie criric appena possibile lo provo e vedrò di "montarlo" nello script..stasera ho sonnolenza
comunque mi sembra ok come concetto...sovrascivere l'intero file con solo il giorno che interessa
se non ho capito male.
Thank you

 

[max_400]

Ok Funziona perfettamente!
Grazie Criric, quando mi trovo a passare dalle tue parti ti porto un paio di brioscie e un cappuccino
ti mando il cameriere del bar vicino casa tua... ih ih ih
thank you

 

[criric]

Se passi la mattina va bene altrimenti basta un birra :beer: