3v4l.org

run code in 300+ PHP versions simultaneously
<?php function check_tcno($tcno) { preg_replace('/([1-9]{1})([0-9]{1})([0-9]{1})([0-9]{1})([0-9]{1})([0-9]{1})([0-9]{1})([0-9]{1})([0-9]{1}).*$/e', "eval('\$on=((((\\1+\\3+\\5+\\7+\\9)*7)-(\\2+\\4+\\6+\\8))%10); \$onbir=(\\1+\\2+\\3+\\4+\\5+\\6+\\7+\\8+\\9+\$on)%10; \$sonIki = \$on.\$onbir;')", $tcno); return(substr($tcno, -2) == $sonIki); }
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 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 - 8.3.6
preferences:
304.64 ms | 406 KiB | 459 Q