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<?php function luhn_validate($num) { $sum = 0; for($i=0; $i<strlen($num); $i++) { if($i & 1) { // odd $sum += (int)$num[$i]*2-9; } else { // even $sum += (int)$num[$i]; } } return (is_integer($sum / 10 )) ? true : false; } var_dump(luhn_validate('4111888888881881')); var_dump(luhn_validate('15616516516165165'));
Output for 5.6.38, 7.1.0 - 7.1.22, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
bool(true) bool(false)
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 bool(true) bool(false)
preferences:
142.61 ms | 402 KiB | 171 Q