Function true/false return valuesPHP ManualPrevAppendix A. Migrating from PHP/FI 2.0 to PHP 3.0NextFunction true/false return values Most internal functions have been rewritten so they return TRUE when successful and FALSE when failing, as opposed to 0 and -1 in PHP/FI 2.0, respectively. The new behaviour allows for more logical code, like $fp = fopen("/your/file") or fail("darn!");. Because PHP/FI 2.0 had no clear rules for what functions should return when they failed, most such scripts will probably have to be checked manually after using the 2.0 to 3.0 convertor. Example A-9. Migration from 2.0: return values, old code 1  2 $fp = fopen($file, "r"); 3 if ($fp == -1); 4  echo("Could not open $file for reading<br>\n"); 5 endif; 6  Example A-10. Migration from 2.0: return values, new code 1  2 $fp = @fopen($file, "r") or print("Could not open $file for reading<br>\n"); 3 PrevHomeNextShort-circuited boolean evaluationUpOther incompatibilities