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lai nolasa pēdējos 5 ierakstus


kalabox
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kā dabūt lai nolasa tikai pēdējos 5 ierakstus?? 

 

<?php
$file = "viesi.txt";
 
if (fopen($file, "r")) {
$fil = "viesi.txt";
$fo = fopen ($fil, "r");
$con = fread ($fo,filesize ($fil));
fclose ($fo);
echo "$con";
} else {
echo "<h3>Radās kļūda, sazinies ar mums<h3>";
}
?>
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Izmanto datu bāzi failu vietā. Bet ja gribas caur pakaļu,tad var ielasīt visu failu masīvā,apmest reversā un ciklā izvadīt cik vajag.

 

Un ja fails ir 20gb liels, tad arī lasīsi masīvā?

 

 

Ja ieraksti atdalās ar newline, tad ar fseek aizej līdz pašām faila beigām un tad ciklā ar fread lasi pa vienam simbolam. Cheko katru simbolu. Ciklu pārtrauc kad esi atradis 5 newline simbolus

 

$f = fopen( 'fails.txt', 'r' );
$pos = filesize( 'fails.txt' ) - 1;
$found = 0;
$lastLines = '';
fseek( $f, $pos );
while ( $s = fread( $f, 1 ) ) {
    if ( $s == "\n" )
        if ( ++$found > 4 )
            break;
        
    $lastLines = $s.$lastLines;
    
    fseek( $f, --$pos );
}
 
var_dump( explode( "\n", $lastLines ) );
Edited by aaxc
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Un ja fails ir 20gb liels, tad arī lasīsi masīvā?

Nē-pie tāda viesu grāmatas trafika lasīšu memkešā no datu bāzes. Bet ja saki,ka šādas tēmas autoram fseek ir tas kas vajadzīgs,tad steidzami labojos un drošu sirdi rekomendēju pielāgot pēc vajadzībām šo:

http://stackoverflow.com/questions/2961618/how-to-read-only-5-last-line-of-the-txt-file/#answer-13936967

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