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<?php /** * @see https://community.developer.authorize.net/t5/The-Authorize-Net-Developer-Blog/Precision-Math-with-PHP/ba-p/8368 */ var_dump((0.2 + 1.4) * 10); var_dump(floor((0.2 + 1.4) * 10)); // Should be 16. But it's 15! // Using BC Math var_dump(bcadd('0.2', '1.4', 2) * 10); // It's 16 like we would expect it to be.
Output for 8.0.0 - 8.0.12, 8.0.14 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
float(15.999999999999998) float(15) float(16)
Output for 8.0.13
float(15.999999999999998) float(15) Fatal error: Uncaught Error: Call to undefined function bcadd() in /in/lOHnK:12 Stack trace: #0 {main} thrown in /in/lOHnK on line 12
Process exited with code 255.
Output for 7.0.5, 7.3.32 - 7.3.33, 7.4.33
float(16) float(15) Fatal error: Uncaught Error: Call to undefined function bcadd() in /in/lOHnK:12 Stack trace: #0 {main} thrown in /in/lOHnK on line 12
Process exited with code 255.
Output for 5.5.24 - 5.5.28, 5.5.31 - 5.5.33, 5.5.35, 5.6.8 - 5.6.12, 5.6.16 - 5.6.19, 5.6.21 - 5.6.28, 7.0.0 - 7.0.4, 7.0.6 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.32
float(16) float(15) float(16)
Output for 5.5.29 - 5.5.30, 5.5.34, 5.6.13 - 5.6.15, 5.6.20
float(16) float(15) Fatal error: Call to undefined function bcadd() in /in/lOHnK on line 12
Process exited with code 255.

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