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run code in 150+ php & hhvm versions
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<?php $bad_char = "♥"; $error_msg = "Illegal: $bad_char"; $code = "I \$♥ PHP"; if ( mb_strpos( $code, $bad_char) ) { exit( $error_msg ); }
based on epp66
Output for 4.3.0 - 7.1.0
Illegal: ♥