[英]PHP comparison of two values?
While comparing the values in the below array 比较下面数组中的值
array
0 =>
array
0 => string '09:30' (length=5)
1 => string '11:00' (length=7)
1 =>
array
0 => string '11:01' (length=5)
1 => string '18:00' (length=7)
2 =>
array
0 => string '12:05' (length=5)
1 => string '14:00' (length=7)
3 =>
array
0 => string '14:00' (length=5)
1 => string '20:20' (length=7)
If I am using if($a > $b)
it is even giving true for equal values ($a = $b) // this is not comparision
, while if($a - $b > 0)
is giving accurate result. 如果我使用的是
if($a > $b)
甚至等于相等的值($a = $b) // this is not comparision
,而if($a - $b > 0)
则给出准确的结果。
Why so ? 为什么这样 ?
EDIT: The code part where I am using cmp. 编辑:我正在使用cmp的代码部分。
This woks fine 这锅好
for($i=0; $i < $fr -1 ; $i++)
{
if( $dtime[$i][1] - $dtime[$i+1][0] > 0 )
{
echo 'It is clashing';
break;
}
}
This does not works fine 这行不通
for($i=0; $i < $fr -1 ; $i++)
{
if( $dtime[$i][1] > $dtime[$i+1][0] )
{
echo 'It is clashing';
break;
}
}
Though the way you're doing comparisons seems odd, I think you have a data cleaning problem. 尽管您进行比较的方式似乎很奇怪,但我认为您存在数据清理问题。 In the top part of your question it appears you're doing a
var_dump()
. 在问题的顶部,您似乎正在执行
var_dump()
。 Notice how '09:30' (length=5)
is correct but '11:00' (length=7)
is wrong because the length should be 5 also. 注意
'09:30' (length=5)
是正确的,但是'11:00' (length=7)
是错误的,因为长度也应为5。 There are some additional hidden characters (maybe \\n or \\r) at the beginning or end of the data. 在数据的开头或结尾还有一些其他隐藏字符(可能是\\ n或\\ r)。
To fix, try running $value = trim($value)
on each of your array elements before comparing. 要进行修复,请在比较之前尝试对每个数组元素运行
$value = trim($value)
。
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