php cannot run as command at LINUX

Dear all, When I used the php engine to execute the .php files, it show the following: [ PHP Warning: Unable to load dynamic library '/usr/lib/apache/libphp4.so' - undefined symbol: ap_block_alarms in Unknown on line 0 ] So how can I solve this problem, please? Best regards, Sidney ============================================================================ ============================================ [root@pc122 apache]# php -h Content-type: text/html PHP Warning: Unable to load dynamic library '/usr/lib/apache/libphp4.so' - undefined symbol: ap_block_alarms in Unknown on line 0 Usage: php [-q] [-h] [-s [-v] [-i] [-f <file>] | {<file> [args...]} -q Quiet-mode. Suppress HTTP Header output. -s Display colour syntax highlighted source. -f <file> Parse <file>. Implies `-q' -v Version number -C Do not chdir to the script's directory -c <path> Look for php.ini file in this directory -a Run interactively -d foo[=bar] Define INI entry foo with value 'bar' -e Generate extended information for debugger/profiler -z <file> Load Zend extension <file>. -l Syntax check only (lint) -m Show compiled in modules -i PHP information -h This help