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@ 2014-10-30T13:37:13Z

<?php

$a = 24.99;
$b = 25;
$epsilon = 0.00001;

if(abs($a-$b) < $epsilon) {
    echo "true";
}

Output
Performance
VLD
References
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abs: documentation ( source)

preferences:dark modelive preview

41.01 ms | 402 KiB | 5 Q