PHP: Direct assignment of floating-point number can not pass Bccomp, direct comparison?

$a = "1.2424"; Direct Assignment

$b = 1.2424; Read from the MySQL database float field

if (floatval ($a) >= $b) {
Echo 1;
}

I know that floating point numbers have precision problems and need to be compared by Bccomp.

However, can the above example be directly compared? If not, please cite examples of failure

A b variable is directly assigned, and no operation is done before and after the assignment, and is directly compared by the algorithm.

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$a = "1.2424"; Direct Assignment

$b = 1.2424; Read from the MySQL database float field

if (floatval ($a) >= $b) {
Echo 1;
}

I know that floating point numbers have precision problems and need to be compared by Bccomp.

However, can the above example be directly compared? If not, please cite examples of failure

A b variable is directly assigned, and no operation is done before and after the assignment, and is directly compared by the algorithm.

No.

php -r "var_dump( 1242.4/1000, floatval('1.2424') >= 1242.4/1000 );"float(1.2424)bool(false)

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