read file in descending php [closed] - php

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Closed 11 years ago.
hi im trying to read a file in descending order.
i want to echo last 10 words from the file
expected result:
brian tracy, brian tracy, der reiche
sack, der reiche sack, der reiche
sack, electrical machines by charles s
siskind second e, test de politica
fiscal, gigantomastia,gigantomastia,,
a,
file i want to read :
find a doctor, Find a Doctor,technique with fingers of right hand over left ven, la empresa adaptable, la empresa adaptable en la era de la informaci n, la pobre mia, probabilidad estadistica, crack beam, dwarf rabbit, probabilidad estadistica, kamsutra bangla, power of the dog, power of the dog, prinsip kerja uji ninhidrin, letramania 3, gre, gre, prinsip kerja uji ninhidrin, prinsip kerja uji ninhidrin, artificial intelligence a modern approach, configuring sap erp financials and controlling, gas spring, imperio carolingio, blue collar man, caligrafia, wonderlic, women and weight loss tamasha, women and the weight loss tamasha, vivir amar y aprender leo buscaglia, vivir amar y aprender leo buscaglia, wonderlic, plan de manejo ambiental, calibra o de manometros, curso de carpinteria, secreto industrial, secreto industrial, deneme, elementos secundarios de un triangulo, imperio carolingio, caligrafia, construir en lo construido, plan de manejo ambiental, lisboa, lisboa secreta, modelo de contrato secreto industrial, el conde de montecristo, metode titrasi formol, metode titrasi formol, probabilidad estadistica, probabilidad estadistica, history of islam akbar shah najeebabadi, caligrafia, caligrafia, conversacion en la catedral, brian tracy, brian tracy, der reiche sack, der reiche sack, der reiche sack, electrical machines by charles s siskind second e, test de politica fiscal, gigantomastia,gigantomastia, Find a Doctor, Find a Doctor,technique with fingers of right hand over left ven, la empresa adaptable, la empresa adaptable en la era de la informaci n, la pobre mia, probabilidad estadistica, crack beam, dwarf rabbit, probabilidad estadistica, kamsutra bangla, power of the dog, power of the dog, prinsip kerja uji ninhidrin, letramania 3, gre, gre, prinsip kerja uji ninhidrin, prinsip kerja uji ninhidrin, artificial intelligence a modern approach, configuring sap erp financials and controlling, gas spring, imperio carolingio, blue collar man, caligrafia, wonderlic, women and weight loss tamasha, women and the weight loss tamasha, vivir amar y aprender leo buscaglia, vivir amar y aprender leo buscaglia, wonderlic, plan de manejo ambiental, calibra o de manometros, curso de carpinteria, secreto industrial, secreto industrial, deneme, elementos secundarios de un triangulo, imperio carolingio, caligrafia, construir en lo construido, plan de manejo ambiental, lisboa, lisboa secreta, modelo de contrato secreto industrial, el conde de montecristo, metode titrasi formol, metode titrasi formol, probabilidad estadistica, probabilidad estadistica, history of islam akbar shah najeebabadi, caligrafia, caligrafia, conversacion en la catedral, brian tracy, brian tracy, der reiche sack, der reiche sack, der reiche sack, electrical machines by charles s siskind second e, test de politica fiscal, gigantomastia,gigantomastia,, a,

Answer 1

If the file will not be too big, you can simply read it all and then remove the data you don't need :
$content = file_get_contents($filename); // $filename is the file to read
$chunks = explode($delimiter, $content); // $delimiter is your word separator
$chunks = array_slice($chunks, -$n); // $n is the number of words to keep from the end of the file
// NOTE : -$n !
If the file will grow beyond reasonable size to be loaded into memory, you may read it in chunks. Something like (untested) :
function getLastTokens($filename, $n, $delimiter) {
$offset = filesize($filename);
$chunksize = 4096; // 4K chunk
if ($offset <= $chunksize * 2) {
// our one liner here because the file is samll enough
$tokens = explode($delimiter, file_get_contents($filename));
} else {
$tokens = array();
$fp = fopen($filename, 'r');
$chunkLength = 0;
while (count($tokens) < $n && $offset > 0) {
$lastOffset = $offset;
$offset -= $chunksize;
if ($offset < 0) $offset = 0; // can't seek before first byte
$chunkLength += ($lastOffset - $offset); // how much to read
fseek($fp, $offset);
$data = fread($fp, $chunkLength); // read the next (previous) chunk
if (($pos = strpos($data, $delimiter)) !== false) {
$chunkLength = 0; // reset chunk size to read next time
$offset += $pos;
$data = explode($delimiter, substr($data, $pos + 1));
array_unshift($data, & $tokens); // make $tokens the $data array's first element
// with the last line, this is equivalent to
// array_push($tokens, $data[1], $data[2], $data[3], ....)
call_user_func_array('array_push', $data);
}
}
fclose($fp);
}
fclose($fp);
return array_slice($tokens, -$n);
}

Answer 2

$file = "File contents"; //File get contents or anything else here.
$array = explode(",", $file);
$array = array_slice($array, -10, 10); //Starting from Last 10th element, get Ten elements.
$string = implode(", ", $array);
echo $array;
Edit:
Changed the implementation to remove the loop and the count etc.

Answer 3

$text = file_get_contents($file); //get contents of file
$words = explode(',', $text); //split into array
if (($length = count($words) < 10) {
$lastWords = $words; //shorter than 10 so return all
} else {
for ($i = $length-11, $i < $length; $i++ { //loop through last 10 words
$lastWords[] = $words[$i]; //add to array
}
}
$str = implode(',', $lastWords); //change array back into a string
echo $str;