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[2014-12-05 12:54 UTC] frederic dot hardy at mageekbox dot net
Description:
------------
filter_var() with option FILTER_VALIDATE_INT return false if its argument is an integer casted to float with strlen($integer) > ini_get('precision').
Test script:
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<?php
ini_set('precision', 14); // PHP default
$i = 12345678912345; // strlen($i) == 14
var_dump(strlen($i));
var_dump(filter_var((float) $i, FILTER_VALIDATE_INT)); // $i
var_dump((float) $i == $i); // true
$i = 123456789123456; // strlen($i) = 15
var_dump(strlen($i));
var_dump(filter_var((float) $i, FILTER_VALIDATE_INT)); // false instead of $i
var_dump((float) $i == $i); // true
Expected result:
----------------
int(14)
int(12345678912345)
bool(true)
int(15)
bool(123456789123456)
bool(true)
Actual result:
--------------
int(14)
int(12345678912345)
bool(true)
int(15)
bool(false)
bool(true)
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Last updated: Fri May 24 16:01:26 2019 UTC |
Pierre just say me on IRC to add this script to illustrate the problem: <?php ini_set('precision', 2); var_dump(filter_var(1.0, FILTER_VALIDATE_INT)); // int(1) var_dump(filter_var(100.0, FILTER_VALIDATE_INT)); // bool(false) ?> So, filter_var(1.0, FILTER_VALIDATE_INT) should return false, as filter_var(100.0, FILTER_VALIDATE_INT), or filter_var(100.0, FILTER_VALIDATE_INT) should return int(100)...Moreover, to be clear: <?php ini_set('precision', 2); $i = 100; var_dump(filter_var((float) $i, FILTER_VALIDATE_INT)); // bool(false) var_dump((float) $i == $i); // bool(true) ?> So, how a float can be equal to an integer if it's not an integer ?