PHP浮点比较大小的方法,php浮点大小
本文实例讲述了PHP浮点比较大小的方法。分享给大家供大家参考,具体如下:
<?php /** * 浮点数一般是不能用来比较大小的,但是我们可以用一种变通的的方式 * 用var_dump输出浮点是看不出效果的,可以用serialize查看 * 1.round 2.浮点转换成字符串 * * 转换成字符串方法: * 通过在其前面加上(string)或用strval()函数来转变成 字符串 * 在一个需要字符串的表达式中,字符串会自动转变,比如在使用函数 echo() 或 print() 时, 或在一个变量和一个 字符串 进行比较时,就会发生这种转变 * true会转为1 , 而false则会转为空字符串 * */ $a = 13.2; $b = 24; $c = $a/$b; //实际值是这个d:0.54999999999999993338661852249060757458209991455078125; echo serialize($c).'<br/>';// echo $c.'<br/>';//输出时会显示成0.55 实际的值是比他小的 //所以直接和0.55比较大小是不成立的 if($c == 0.55){ echo 'nothing'; } $c = round($c,2); //用round处理 if($c == 0.55){ echo 'ok'; } echo "<br/>"; //强制转为字符串 // $c = (string)$c; // $c = strval($c); if("$c" == 0.55){ echo 'ok'; } ?>
运行结果如下:
d:0.54999999999999993338661852249060757458209991455078125; 0.55 ok ok
更多关于PHP相关内容感兴趣的读者可查看本站专题:《PHP运算与运算符用法总结》、《PHP基本语法入门教程》、《PHP错误与异常处理方法总结》及《php常用函数与技巧总结》
希望本文所述对大家PHP程序设计有所帮助。
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