Introduction to several methods of keeping two decimal places in PHP

1. No carry

such as 3.149569 Take two decimal places , The last two can't be rounded . result ：3.14.

have access to floor function

This function is rounding . for example ,floor(4.66456) result ：4 .

floor(9.1254) result 9 .

therefore , Go to two decimal places , You need to multiply 100, Then round off and round off , Divided by 100, namely ：

$a=floor(3.149569*100)/100

At this point, a floating-point calculation will appear bug, adopt php To solve this problem , First strval Convert to string , Then automatically identify the type . The following percentage calculation has been used strval() Function

Calculate percentage

$successRate = floor(strval((2/3)*10000))/10000*100;
$result = $successRate.'%';

2. Rounding off

round function

float round ( float val [, int precision])

Return to val Specify the precision according to precision（ The number of digits after the decimal point ） The result of rounding .

precision It can also be negative or zero （ The default value is ）.

sprintf function

Achieve rounding , And if it doesn't have a decimal place , Will automatically use the specified characters （ designated 0） Add to specified decimal places

echo sprintf("%01.2f", 5.228);  //  5.23
echo sprintf("%01.2f", 5.224);  //  5.22
echo sprintf("%01.2f", 5);      //  5.00

number_format function

If it is without decimal places , Will use automatically 0 Add to specified decimal places

echo number_format(5.228,2);    //  5.23
echo number_format(5.224,2);    //  5.22
echo number_format(5,2); //  5.00

round function

This function can realize rounding , But if it doesn't have a decimal place , No decimal places after processing

echo round(5.228,2);    //  5.23
echo round(5.224,2);    //  5.22
echo round(5,2); //  5

php Take the whole thing in one way

echo ceil(4.4);     //  5
echo ceil(4.6);     //  5

php To round out by giving up

echo floor(4.4); //  4
echo floor(4.6); //  4