PHP Floating-point comparison size method _php Tips

The example in this article tells you how to compare the PHP floating-point size. Share to everyone for your reference, specific as follows:

<?php
/**
 * Floating-point numbers are generally not used to compare size, but we can use a flexible way to
 use var_dump output floating-point is not see the effect, you can use Serialize view
 * 1.round 2. Floating-point conversions to Strings
 *
 * Converting to String methods:
 * Convert to String by preceding (string) or by using the Strval () function
 * In an expression that requires a string, the string automatically transitions, such as using the function echo () or print (), or when a variable is compared to a string, the transformation
 * True will change to 1, and false to an empty string
 *
/$a = 13.2;
$b =;
$c = $a/$b;
The actual value is this d:0.54999999999999993338661852249060757458209991455078125;
Echo Serialize ($c). ' <br/> '//
echo $c. ' <br/> '//output will show 0.55 the actual value is smaller than his
//So direct and 0.55 comparison size is not tenable
if ($c = = 0.55) {
  echo ' nothing ';
}
$c = Round ($c, 2);
Use round to process
if ($c = = 0.55) {
  echo ' OK ';
}
echo "<br/>";
Force to a string
//$c = (string) $c;
$c = Strval ($c);
if ("$c" = = 0.55) {
  echo ' OK ';
}
? >

The results of the operation are as follows:

d:0.54999999999999993338661852249060757458209991455078125;
0.55
OK
OK

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I hope this article will help you with the PHP program design.