执行PHP的编译命令：
sudo ./configure --with-apxs2=/usr/local/apache2/bin/apxs --with-mysql
sudo make
产生下面的错误信息：
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/usr/local/src/php-5.4.3/ext/standard/info.c:105:
ext/standard/.libs/info.o: In function php_info_printf':<br/>/usr/local/src/php-5.4.3/ext/standard/info.c:83: undefined reference tots_resource_ex'
ext/standard/.libs/info.o: In function php_info_print_html_esc':<br/>/usr/local/src/php-5.4.3/ext/standard/info.c:69: undefined reference tots_resource_ex'
ext/standard/.libs/info.o: In function php_print_gpcse_array':<br/>/usr/local/src/php-5.4.3/ext/standard/info.c:208: undefined reference toexecutor_globals_id'
ext/standard/.libs/info.o: In function php_info_print_request_uri':<br/>/usr/local/src/php-5.4.3/ext/standard/info.c:97: undefined reference tosapi_globals_id'
ext/standard/.libs/info.o: In function php_print_info':<br/>/usr/local/src/php-5.4.3/ext/standard/info.c:874: undefined reference toexecutor_globals_id'
collect2: ld returned 1 exit status
make: *** [sapi/cli/php] 错误 1
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出现这样的错误信息可能是我以前用不同的参数编译过PHP。
解决方法：执行make clean删除上次的编译结果，然后再重新编译就OK了。