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<?php //第一种方法: $line = getrandline1('test.txt'); function getrandline1($filename) { $linenum = 0; $fh = fopen($filename, 'r'); while(!feof($fh)) { if($rowcontents = fgets($fh)) { $linenum++; $contens[] = $rowcontents; } } $randline = mt_rand(0, $linenum - 1); $line = $contens[$randline]; fclose($fh); return $line; } //第二种方法: $line = getrandline2('test.txt'); function getrandline2($filename) { $contents = file('test.txt'); $linenum = count($contents); $randline = mt_rand(0, $linenum - 1); $line = $contents[$randline]; return $line; } //第三种方法: $line = getrandline3('test.txt'); function getrandline3($filename) { $contents = file('test.txt'); shuffle($contents); return $contents[0]; } //第四种方法: $line = getrandline4('test.txt'); function getrandline4($filename) { $linenum = 0; $fh = fopen($filename, 'r'); while(!feof($fh)) { if($linecontents = fgets($fh)) { $linenum++; $randint = (mt_rand(1, 1000000 * $linenum) - 1)/1000000); if($randint < 1) { $line = $linecontents; } } } fclose($fh); return $line; } ?>