#41383 [NEW]: Function in 'required' File doesn't Appear to Exist

From: chris at dented-planet dot net Operating system: Mac OS X PHP version: 5.2.2 PHP Bug Type: Unknown/Other Function Bug description: Function in 'required' File doesn't Appear to Exist Description: ------------ The documentation on functions (http://www.php.net/manual/en/language.functions.php) says: "In PHP 3, functions must be defined before they are referenced. No such requirement exists since PHP 4. Except when a function is conditionally defined..." I don't understand why the following code (in three different files BTW) doesn't work as expected. It doesn't seem to be conditionally defined. Tested with PHP 4.4.4-CLI, PHP 5.2.1, PHP 5.2.2. I am openminded that this may not be a bug but I can't seem to find an explanation. Reproduce code: --------------- FILE a.php: <?php error_reporting(E_ALL | E_NOTICE); echo "FILE 'a.php'\n"; if (function_exists('test')) { echo test(); } else { echo "function 'test()' doesn't exist!\n"; } require 'b.php'; ?> ------ FILE b.php <?php echo "FILE 'b.php'\n"; require 'c.php'; ?> ------ FILE c.php <?php echo "FILE 'c.php'\n"; function test() { return "function test() was called!\n"; } ?> Expected result: ---------------- SIGNIFICANT expected result: 'function test() was called!' is echoed. Other output is for debugging. Actual result: -------------- Actual result: 'function 'test()' doesn't exist!' is echoed. -- Edit bug report at http://bugs.php.net/?id=41383&edit=1 -- Try a CVS snapshot (PHP 4.4): http://bugs.php.net/fix.php?id=41383&r=trysnapshot44 Try a CVS snapshot (PHP 5.2): http://bugs.php.net/fix.php?id=41383&r=trysnapshot52 Try a CVS snapshot (PHP 6.0): http://bugs.php.net/fix.php?id=41383&r=trysnapshot60 Fixed in CVS: http://bugs.php.net/fix.php?id=41383&r=fixedcvs Fixed in release: http://bugs.php.net/fix.php?id=41383&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=41383&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=41383&r=needscript Try newer version: http://bugs.php.net/fix.php?id=41383&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=41383&r=support Expected behavior: http://bugs.php.net/fix.php?id=41383&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=41383&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=41383&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=41383&r=globals PHP 3 support discontinued: http://bugs.php.net/fix.php?id=41383&r=php3 Daylight Savings: http://bugs.php.net/fix.php?id=41383&r=dst IIS Stability: http://bugs.php.net/fix.php?id=41383&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=41383&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=41383&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=41383&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=41383&r=mysqlcfg