The following function retrieves a line in a file, regardless of its size, so you won't get an error if the file's size is beyond php's allowed memory limit (the string has to be below however), which is something i was needing for accessing a big log file generated by a webhost. Indexes start at 1 (so $line = 1 means the first line unlike arrays). If the file is small, it would be better to use "file()" however.
<?php
function strpos_count($haystack, $needle, $i = 0) {
while (strpos($haystack,$needle) !== false) {$haystack = substr($haystack, (strpos($haystack,$needle) + 1)); $i++;}
return $i;
}
function getLine($file,$line=1){
$occurence = 0;
$contents = '';
$startPos = -1;
if (!file_exists($file)) return '';
$fp = @fopen($file, "rb");
if (!$fp) return '';
while (!@feof($fp)) {
$str = @fread($fp, 1024);
$number_of_occurences = strpos_count($str,"\n");
if ($number_of_occurences == 0) {if ($start_pos != -1) {$contents .= $str;}}
else {
$lastPos = 0;
for ($i = 0; $i < $number_of_occurences; $i++){
$pos = strpos($str,"\n", $lastPos);
$occurence++;
if ($occurence == $line) {
$startPos = $pos;
if ($i == $number_of_occurences - 1) {$contents = substr($str, $startPos + 1);}
} elseif ($occurence == $line + 1) {
if ($i == 0) {$contents .= substr($str, 0, $pos);} else {$contents = substr($str, $startPos, $pos - $startPos);}
$occurence = 0;
break;
}
$lastPos = $pos + 1;
}
}
}
@fclose($fp);
return $contents;
}
?>
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9 years ago