Four ways to randomly extract a piece of data from a php file_PHP tutorial

This article will introduce to you an example of randomly extracting a piece of data from a php file. I hope this tutorial will be helpful to all students.

代码如下

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//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; } ?>

http://www.bkjia.com/PHPjc/633151.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/633151.htmlTechArticleThis article will introduce to you an example of randomly extracting a piece of data from a php file. I hope this tutorial will be useful to all students. Help. The code is as follows Copy code ?php //First method: $lin...