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<?php class Test{ const ♥ = "love"; } $class = new ReflectionClass("Test"); $constant = "♥"; if ( $class->hasConstant( $constant ) ) { if ( mb_strpos( $constant, "♥") !== false ) { trigger_error( "Bad Usage: $bad_char" ); } }
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined variable $bad_char in /in/pQb0R on line 7 Notice: Bad Usage: in /in/pQb0R on line 7

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