PHP 4.0 Bug #7949 Updated: Bad comparsion of variables

ID: 7949 Updated by: stas Reported By: profix@volny.cz Status: Closed Bug Type: Scripting Engine problem Assigned To: Comments: use === for literal compare. == is numerical compare, and "dd" converts to numerical 0. Previous Comments: --------------------------------------------------------------------------- [2000-11-23 10:08:34] profix@volny.cz <? // bug report from profix@volny.cz // int(0) = string (2) "dd" ? I thing that no... $testint=0; $teststr="dd"; // control vardump var_dump($testint); echo "<br>"; var_dump($teststr); echo "<br>"; if ($testint==$teststr) echo "FUCK !!!"; /// this print fuck // so if I use if (strval($testint)==$teststr) echo "FUCK !!!"; /// this dont print fuck // Why there is no auto convertion into the same type of compared variables? // Well, if $testint is anything else (but integer-type except 0),it is working fine, // but with zero it does not want to work properly. // Example $testint=1; $teststr="dd"; // control vardump var_dump($testint); echo "<br>"; var_dump($teststr); echo "<br>"; if ($testint==$teststr) echo "FUCK !!!"; /// this dont print fuck /* My php info - 192.168.0.98 id my localhost - WPN PHP Version 4.0.3pl1 System Windows 95/98 4.10 // it is Czech language version of Windows 98 Build Date Oct 15 2000 Server API CGI Virtual Directory Support enabled Configuration File (php.ini) Path php.ini ZEND_DEBUG disabled Thread Safety enabled This program makes use of the Zend scripting language engine: Zend Engine v1.0.3, Copyright (c) 1998-2000 Zend Technologies -------------------------------------------------------------------------------- PHP 4.0 Credits -------------------------------------------------------------------------------- Configuration PHP Core Directive Local Value Master Value allow_call_time_pass_reference On On arg_separator & & asp_tags Off Off auto_append_file no value no value auto_prepend_file no value no value browscap no value no value default_charset no value no value default_mimetype text/html text/html define_syslog_variables Off Off disable_functions no value no value display_errors On On display_startup_errors Off Off doc_root no value no value enable_dl On On error_append_string Off Off error_log no value no value error_prepend_string Off Off error_reporting no value no value expose_php On On extension_dir no value no value file_uploads 1 1 gpc_order GPC GPC highlight.bg #FFFFFF #FFFFFF highlight.comment #FF8000 #FF8000 highlight.default #0000BB #0000BB highlight.html #000000 #000000 highlight.keyword #007700 #007700 highlight.string #DD0000 #DD0000 html_errors On On ignore_user_abort Off Off implicit_flush Off Off include_path no value no value log_errors Off Off magic_quotes_gpc On On magic_quotes_runtime Off Off magic_quotes_sybase Off Off max_execution_time 30 30 open_basedir no value no value output_buffering Off Off post_max_size 8M 8M precision 14 14 register_argc_argv On On register_globals On On safe_mode Off Off safe_mode_exec_dir 1 1 sendmail_from no value no value sendmail_path no value no value short_open_tag On On SMTP localhost localhost sql.safe_mode Off Off track_errors Off Off upload_max_filesize 2M 2M upload_tmp_dir no value no value user_dir no value no value variables_order no value no value y2k_compliance Off Off standard Regex Library Bundled library enabled Dynamic Library Support enabled Internal Sendmail Support for Windows 4 enabled Directive Local Value Master Value assert.active 1 1 assert.bail 0 0 assert.callback no value no value assert.quiet_eval 0 0 assert.warning 1 1 safe_mode_allowed_env_vars PHP_ PHP_ safe_mode_protected_env_vars LD_LIBRARY_PATH LD_LIBRARY_PATH session.use_trans_sid 1 1 bcmath BCMath support enabled Calendar Calendar support enabled com Directive Local Value Master Value allow_dcom Off Off typelib_file no value no value ftp FTP support enabled mysql MySQL Support enabled Active Persistent Links 0 Active Links 0 Client API version 3.23.10-alpha Directive Local Value Master Value mysql.allow_persistent On On mysql.default_host no value no value mysql.default_password no value no value mysql.default_port no value no value mysql.default_socket no value no value mysql.default_user no value no value mysql.max_links Unlimited Unlimited mysql.max_persistent Unlimited Unlimited odbc ODBC Support enabled Active Persistent Links 0 Active Links 0 ODBC library Win32 Directive Local Value Master Value odbc.allow_persistent On On odbc.check_persistent On On odbc.default_db no value no value odbc.default_pw odbc.default_user no value no value odbc.defaultbinmode return as is return as is odbc.defaultlrl return up to 4096 bytes return up to 4096 bytes odbc.max_links Unlimited Unlimited odbc.max_persistent Unlimited Unlimited pcre PCRE (Perl Compatible Regular Expressions) Support enabled PCRE Library Version 3.1 09-Feb-2000 session Session Support enabled Directive Local Value Master Value session.auto_start Off Off session.cache_expire 180 180 session.cache_limiter nocache nocache session.cookie_domain no value no value session.cookie_lifetime 0 0 session.cookie_path / / session.entropy_file no value no value session.entropy_length 0 0 session.gc_maxlifetime 1440 1440 session.gc_probability 1 1 session.name PHPSESSID PHPSESSID session.referer_check no value no value session.save_handler files files session.save_path /tmp /tmp session.serialize_handler php php session.use_cookies On On xml XML Support active wddx WDDX Support enabled Additional Modules Environment Variable Value COMSPEC C:WINDOWSCOMMAND.COM DOCUMENT_ROOT c:/program files/apache group/apache/htdocs HTTP_ACCEPT image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/vnd.ms-excel, application/msword, application/vnd.ms-powerpoint, * / * HTTP_ACCEPT_ENCODING gzip, deflate HTTP_ACCEPT_LANGUAGE cs HTTP_CONNECTION Keep-Alive HTTP_HOST 192.168.0.98 HTTP_USER_AGENT Mozilla/4.0 (compatible; MSIE 5.5; Windows 98; MSNATLAS01.CZ) PATH C:NOVELLCLIENT32;C:WINDOWS;C:WINDOWSCOMMAND REDIRECT_STATUS 200 REDIRECT_URL /info.php REMOTE_ADDR 192.168.0.98 REMOTE_PORT 1498 SCRIPT_FILENAME c:/php3/php.exe SERVER_ADDR 192.168.0.98 SERVER_ADMIN you@your.address SERVER_NAME 192.168.0.98 SERVER_PORT 80 SERVER_SIGNATURE Apache/1.3.14 Server at 192.168.0.98 Port 80 SERVER_SOFTWARE Apache/1.3.14 (Win32) WINDIR C:WINDOWS GATEWAY_INTERFACE CGI/1.1 SERVER_PROTOCOL HTTP/1.1 REQUEST_METHOD GET QUERY_STRING REQUEST_URI /info.php SCRIPT_NAME /php/php.exe PATH_INFO /info.php PATH_TRANSLATED c:program filesapache groupapachehtdocsinfo.php PHP Variables Variable Value PHP_SELF /php/php.exe/info.php HTTP_SERVER_VARS["PHP_SELF"] /php/php.exe/info.php HTTP_SERVER_VARS["argv"] Array ( ) HTTP_SERVER_VARS["argc"] 0 HTTP_ENV_VARS["COMSPEC"] C:\WINDOWS\COMMAND.COM HTTP_ENV_VARS["DOCUMENT_ROOT"] c:/program files/apache group/apache/htdocs HTTP_ENV_VARS["HTTP_ACCEPT"] image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/vnd.ms-excel, application/msword, application/vnd.ms-powerpoint, * / * HTTP_ENV_VARS["HTTP_ACCEPT_ENCODING"] gzip, deflate HTTP_ENV_VARS["HTTP_ACCEPT_LANGUAGE"] cs HTTP_ENV_VARS["HTTP_CONNECTION"] Keep-Alive HTTP_ENV_VARS["HTTP_HOST"] 192.168.0.98 HTTP_ENV_VARS["HTTP_USER_AGENT"] Mozilla/4.0 (compatible; MSIE 5.5; Windows 98; MSNATLAS01.CZ) HTTP_ENV_VARS["PATH"] C:\NOVELL\CLIENT32;C:\WINDOWS;C:\WINDOWS\COMMAND HTTP_ENV_VARS["REDIRECT_STATUS"] 200 HTTP_ENV_VARS["REDIRECT_URL"] /info.php HTTP_ENV_VARS["REMOTE_ADDR"] 192.168.0.98 HTTP_ENV_VARS["REMOTE_PORT"] 1498 HTTP_ENV_VARS["SCRIPT_FILENAME"] c:/php3/php.exe HTTP_ENV_VARS["SERVER_ADDR"] 192.168.0.98 HTTP_ENV_VARS["SERVER_ADMIN"] you@your.address HTTP_ENV_VARS["SERVER_NAME"] 192.168.0.98 HTTP_ENV_VARS["SERVER_PORT"] 80 HTTP_ENV_VARS["SERVER_SIGNATURE"] Apache/1.3.14 Server at 192.168.0.98 Port 80 HTTP_ENV_VARS["SERVER_SOFTWARE"] Apache/1.3.14 (Win32) HTTP_ENV_VARS["WINDIR"] C:\WINDOWS HTTP_ENV_VARS["GATEWAY_INTERFACE"] CGI/1.1 HTTP_ENV_VARS["SERVER_PROTOCOL"] HTTP/1.1 HTTP_ENV_VARS["REQUEST_METHOD"] GET HTTP_ENV_VARS["QUERY_STRING"] HTTP_ENV_VARS["REQUEST_URI"] /info.php HTTP_ENV_VARS["SCRIPT_NAME"] /php/php.exe HTTP_ENV_VARS["PATH_INFO"] /info.php HTTP_ENV_VARS["PATH_TRANSLATED"] c:\program files\apache group\apache\htdocs\info.php PHP License This program is free software; you can redistribute it and/or modify it under the terms of the PHP License as published by the PHP Group and included in the distribution in the file: LICENSE This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. If you did not receive a copy of the PHP license, or have any questions about PHP licensing, please contact license@php.net. */ ?> --------------------------------------------------------------------------- Full Bug description available at: http://bugs.php.net/?id=7949