Detailed explanation of usage of class SplFileObject for reading large files in PHP

/**Returns the content of the file from line return string
*/
function getFileLines($filename, $startLine = 1, $endLine=50, $method='rb') {
 $content = array() ;
 $count = $endLine - $startLine;
 // Determine the php version (because SplFileObject is used, PHP>=5.1.0)
 if(version_compare(PHP_VERSION, '5.1.0', '>=') ){
 $fp = new SplFileObject($filename, $method);
 $fp->seek($startLine-1);//Go to line N, the seek method parameters start counting from 0
 for($i = 0; $i <= $count; ++$i) {
 $content[]=$fp->current();// current() gets the current row content
 $fp->next() ;//Next line
 }
 }else{//PHP<5.1
 $fp = fopen($filename, $method);
 if(!$fp) return 'error:can not read file';
 for ($ i=1;$i<$startLine;++$i) {// Skip the previous $startLine line
 fgets($fp);
 }
 for($i;$i<=$endLine;++$i ){
 $content[]=fgets($fp);//Read file line content
 }
 fclose($fp);
 }
 return array_filter($content); // array_filter filter: false,null,' '
}



Copy code

echo '

';<ol>var_dump(getFileLines('test.php',35270,35280));<li>echo '

';

Copy Code