Online PHP editor | refs for XKHV4

<?php $tests = ['1613938511.464898123456789', '1613938511.464898923456789', '1613938511.123456789', '1613938511.12345678910', '1613938519.123456789', '1613938511.999999', '1613938511.999999999999']; foreach ($tests as $test) { echo "Testing : $test\n"; $f = (float)$test; // echo " string=" . $f . " | json =" . json_encode($f); $jsonOne = substr(json_encode($f),0,17); $testOne = substr($test,0,17); echo "\n> Test passed :" . $jsonOne ." =?= ". $testOne . " ::: " . ($jsonOne === $testOne ? 'yes' : 'no'); echo "\n-------------------------------------------------\n"; } // more complex testing $test1MResults = []; $testFailed = []; for ($i = 0; $i < 1000000; $i++) { $testFloat = '1613938511.' . $i; $floatN = (float) $testFloat; $jsonN = json_encode($floatN); $floatJsonN = (float) $jsonN; $absN = (int) abs($floatN - $floatJsonN) * 1000000; /** * Why using or when compare text faild ? because json delete the zero at end of a float , but in our testFloat its composed string 'xx'.$i (10) * Why using int comparasion ? to strict verify that $floatN === $floatJsonN with the 6 digits * * You can play with conditions to see example of fails (that are not really a fail but just a wrong comparasion method) */ $passed = ($jsonN === $testFloat || $absN === 0); $test1MResults[] = $passed; if (false === $passed) { $testFailed[] = [$i, $jsonN, $testFloat, $absN, gettype($absN)]; } } $totalTests = count($test1MResults); $totalSuccess = count(array_filter($test1MResults)); $totalFails = $totalTests - $totalSuccess; print_r("Total Success : " . $totalSuccess . "\n"); print_r("Total Fails : " . ($totalFails) . "\n"); if ($totalFails > 0) { $maxShow = 10 > $totalFails ? $totalFails : 10; for ($i=0; $i < $maxShow; $i++) { print_r(json_encode($testFailed[$i])); echo "\n"; } for ($i=$totalFails; $i > $totalFails - $maxShow; $i--) { print_r(json_encode($testFailed[$i])); echo "\n"; } } echo "\n\n"; /** * Total Success : 1000000 * Total Fails : 0 */