如何将MySQL数据库的原始值显示为PHP

Question

早上好！

嗨，我有问题显示来自＆＃34;中等文字＆＃34; MySQL中的字段。

  

我的数据库中的数据：119.511865

     

结果在php：119.51186499999999

如何在php上显示与数据库相同的数据？

[UPDATE] 这里我的字段坐标数据：

  

119.5206，-5.071414,0.0 119.52059600000001，-5.071347,0.0 119.52062600000001，-5.071106000000001,0.0 119.520632，-5.071052,0.0 119.520711，-5.070732,0.0 119.52071299999999，-5.070723,0.0 119.52271800000001，-5.070708,0.0 119.523891，-5.070702， 0.0 119.523942，-5.070702000000001,0.0 119.524918，-5.0707,0.0 119.525947，-5.070687,0.0 119.52701800000001，-5.070678,0.0 119.52807499999999，-5.070671999999999,0.0 119.531112，-5.0706,0.0 119.531166，-5.070577,0.0 119.53105900000001，-5.070378999999999,0.0 119.53094500000002 ，-5.070183,0.0 119.53083，-5.069989,0.0 119.530716，-5.069795,0.0 119.53059400000001，-5.069605,0.0 119.530472，-5.069418,0.0 119.530342，-5.069234999999999,0.0 119.530205，-5.0690550000000005,0.0 119.53006，-5.068882,0.0 119.52990700000001， - 5.068721999999999,0.0 119.52973200000001，-5.068572,0.0 119.529556，-5.068433,0.0 119.529373，-5.068300999999999,0.0 119.52919，-5.068173,0.0 119.529007，-5.068047,0.0 119.528824，-5.067916,0.0 119.528641，-5.067781,0.0 119.52846500000001，-5.067639， 0.0 119.528305， - 5.067486,0.0 119.52816，-5.067315,0.0 119.52812500000002，-5.067265,0.0 119.5281，-5.067196000000001,0.0 119.52803500000002，-5.066981,0.0 119.528013，-5.066659,0.0 119.52799000000002，-5.066337,0.0 119.528031，-5.066015,0.0 119.527955，-5.065704000000001， 0.0 119.52789，-5.06540​​3,0.0 119.527803，-5.065081,0.0 119.52769400000001，-5.064759,0.0 119.527608，-5.064686,0.0 119.52757999999999，-5.064484000000001,0.0 119.527317，-5.064455999999999,0.0 119.527007，-5.064268,0.0 119.52668499999999，-5.064097,0.0 119.526278 ，-5.06397,0.0 119.525677，-5.063908,0.0 119.52537800000002，-5.063952,0.0 119.52509900000001，-5.064017999999999,0.0 119.52477899999998，-5.064126000000001,0.0 119.52452099999998，-5.064127,0.0 119.524093，-5.064129000000001,0.0 119.52279600000001，-5.063951,0.0 119.52249600000002， - 5.063844999999999,0.0 119.522153，-5.0637609999999995,0.0 119.521467，-5.063742000000001,0.0 119.52110300000001，-5.063743,0.0 119.520417，-5.063746,0.0 119.51988199999998，-5.063769,0.0 119.51951799999999，-5.063728,0.0 119.51 9003，-5.063623,0.0 119.518574，-5.063431,0.0 119.51808000000001,5.063218000000001,0.0 119.517651，-5.063069,0.0 119.517351，-5.063006000000001,0.0 119.51711599999999，-5.063028,0.0 119.51677300000001，-5.063137,0.0 119.51643100000001，-5.063224,0.0 119.51603400000002， -5.063108,0.0 119.51564800000001，-5.063066,0.0 119.515348，-5.062939,0.0 119.51502599999999，-5.062875,0.0 119.51453400000001，-5.062920000000001,0.0 119.514106，-5.063029,0.0 119.513571，-5.063203000000001,0.0 119.51329300000002，-5.063462,0.0 119.513037，-5.063764000000001 ，0.0 119.512824，-5.0640220000000005,0.0 119.512697，-5.064366999999999,0.0 119.512613，-5.064732,0.0 119.512593，-5.065205000000001,0.0 119.51257300000002，-5.065699,0.0 119.512554，-5.066279,0.0 119.512299，-5.066796,0.0 119.51217100000001，-5.066968000000001,0.0 119.51197900000001，-5.067162000000001,0.0 119.51163700000001，-5.067314,0.0 119.511209，-5.067487,0.0 119.510888，-5.067552999999999,0.0 119.51046000000001，-5.067727,0.0 119.50984，-5.067900999999999,0.0 119.508311， -5.068541,0.0 119.50784，-5.068714,0.0 119.507567，-5.068777999999999,0.0 119.507431，-5.068737,0.0 119.507287，-5.068689,0.0 119.50715399999999，-5.0687169999999995,0.0 119.506747，-5.068675000000001,0.0 119.50642500000001，-5.068591,0.0 119.506168，-5.068440999999999 ，0.0 119.50606000000002，-5.068263,0.0 119.506032，-5.068256,0.0 119.505909，-5.068034,0.0 119.50580200000002，-5.06797,0.0 119.505566，-5.067821,0.0 119.50533，-5.067714,0.0 119.50481500000001，-5.067652000000001,0.0 119.504408，-5.067610000000001,0.0 119.50387200000002，-5.067548,0.0 119.503486，-5.06755,0.0 119.503187，-5.067572,0.0 119.50295099999998，-5.067659,0.0 119.50287900000001，-5.067718,0.0 119.50273700000001，-5.067746,0.0 119.502438，-5.067853999999999,0.0 119.502139，-5.06807,0.0 119.50162600000002， -5.068309,0.0 119.50115500000001，-5.068547,0.0 119.500663，-5.068785000000001,0.0 119.50029999999998，-5.068894,0.0 119.49988200000001，-5.068948999999999,0.0 119.499196，-5.068823,0.0 119.498703，-5.068653000000001,0.0 119.49838100000001，-5 .068547,0.0 119.49777999999999,5.0683560000000005,0.0 119.497451，-5.0682100000000005,0.0 119.497458，-5.06828,0.0 119.497491，-5.06875,0.0 119.49746200000001，-5.069502,0.0 119.49740200000001，-5.069973,0.0 119.49734100000002，-5.070474000000001,0.0 119.49734199999999，-5.070725 ，0.0 119.497343，-5.071039,0.0 119.49731400000002，-5.071445999999999,0.0 119.49730000000001，-5.071916,0.0 119.497394，-5.072104000000001,0.0 119.49755200000001，-5.072386,0.0 119.49767800000001，-5.072698999999999,0.0 119.497866，-5.072792,0.0 119.498116，-5.072854000000001,0.0 119.498304，-5.072947,0.0 119.49855500000001，-5.073197,0.0 119.49877499999998，-5.073541,0.0 119.49883900000002，-5.073822,0.0 119.49892199999998，-5.074071,0.0 119.498934，-5.074103999999999,0.0 119.498935，-5.074355,0.0 119.498905，-5.074699999999999,0.0 119.49881300000001， -5.07517,0.0 119.498845，-5.075546,0.0 119.49894，-5.075797,0.0 119.499066，-5.076016,0.0 119.499318，-5.076453000000001,0.0 119.499349，-5.076547,0.0 119.499319，-5.076892000000001,0.0 119。 49938699999998，-5.078271,0.0 119.499391，-5.079210999999999,0.0 119.499298，-5.079463,0.0 119.499361，-5.079588000000001,0.0 119.49958100000002，-5.079869000000001,0.0 119.499801，-5.080244,0.0 119.49989600000002，-5.080432,0.0 119.49995900000002，-5.080714,0.0 119.50002300000001， -5.080902,0.0 119.50002300000001,5.080993999999999,0.0 119.502111，-5.081472,0.0 119.503832，-5.082776,0.0 119.50511400000002，-5.083742,0.0 119.505703，-5.084187,0.0 119.505715，-5.084095,0.0 119.506043，-5.083532999999999,0.0 119.506293，-5.0832099999999999 ，0.0 119.507215，-5.081518,0.0 119.50750800000002，-5.081272,0.0 119.50835799999999，-5.07946,0.0 119.50969699999999，-5.077704,0.0 119.50996499999998，-5.077447,0.0 119.510361，-5.077155,0.0 119.51161899999998，-5.076447000000001,0.0 119.51244，-5.07604,0.0 119.513844，-5.075267,0.0 119.51507499999998，-5.074615,0.0 119.516886，-5.073601,0.0 119.51747300000001，-5.073225,0.0 119.51961999999999，-5.071982,0.0 119.5206，-5.071414,0.0

Answer 1

我在我身边测试过。

通过PhpMyAdmin / SQL

我的要求：

 SELECT id, value, AVG(value), SUM(value), value*1, value+1 FROM `41272408` GROUP BY id

结果：

运作良好:)）

通过PHP

我的代码：

<?php

$sql = 'SELECT id, value, AVG(value), SUM(value), value*1, value+1 FROM `41272408` GROUP BY id';

$sth = $dbh->prepare($sql);
$sth->execute();

foreach( $sth->fetchAll(PDO::FETCH_ASSOC) as $row ) {
    echo implode(' ; ', $row);
    echo '<br />';

    echo 'with +1: ';
    echo implode(' ; ', array_map(function($v) { return $v + 1; }, $row));
    echo '<hr />';
}

输出：

1 ; 119.511865 ; 119.511865 ; 119.511865 ; 119.511865 ; 120.511865
with +1: 2 ; 120.511865 ; 120.511865 ; 120.511865 ; 120.511865 ; 121.5118652 ;
---
119.51186499999999 ; 119.51186499999999 ; 119.51186499999999 ; 119.51186499999999 ; 120.51186499999999
with +1: 3 ; 120.511865 ; 120.511865 ; 120.511865 ; 120.511865 ; 121.511865

正如您所看到的，它运行良好......除了PHP算术运算（+1）。

  

请参阅PHP有关 float 的文档以查找模式信息：http://php.net/manual/fr/language.types.float.php

提取物：

  

浮点数的精度有限。 [...]非小学   算术运算可能会产生更大的错误，当然还有错误   当几个操作复合时，必须考虑传播。

     

所以永远不要将浮动数字结果信任到最后一位数，而不是   直接比较浮点数是否相等。 如果更高   精度是必要的，任意精度数学函数和gmp   功能可用。

因此，请遵循文档:)使用特定库进行操作

其他要点

经度/纬度MySql存储的有趣文章：What is the ideal data type to use when storing latitude / longitudes in a MySQL database? 在GIS中使用MySQL的空间扩展。您对标准类型也有一些反思