使用 gdb 调试 PHP 扩展

./configure --enable-debugmake && make install

./ext_skel --extname=mydebug  

PHP_ARG_WITH(mydebug, for mydebug support,Make sure that the comment is aligned:[  --with-mydebug             Include mydebug support])

if test -z "$PHP_DEBUG"; then        AC_ARG_ENABLE(debug,                [--enable-debg  compile with debugging system],                [PHP_DEBUG=$enableval], [PHP_DEBUG=no]        )fi

phpize ./configure --enable-debugmake && make install

PHP_FUNCTION(confirm_mydebug_compiled){        char *arg = NULL;        int arg_len, len;        char *strg;        if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s", &arg, &arg_len) == FAILURE) {                return;        }        len = spprintf(&strg, 0, "Congratulations! You have successfully modified ext/%.78s/config.m4. Module %.78s is now compiled into PHP.", "mydebug", arg);        RETURN_STRINGL(strg, len, 0);}

运行 nm mydebug.so返回 zif_confirm_mydebug_compiled    ……

第一步运行: gdb php然后运行： break  zif_confirm_mydebug_compiled终端提示：Function "zif_confirm_mydebug_compiled" not defined.Make breakpoint pending on future shared library load? (y or [n]) 输入： y输入:  run /tmp/test.php此时会回显:Breakpoint 1, zif_confirm_mydebug_compiled (ht=1, return_value=0xb7bf0d44, return_value_ptr=0xb7bd6104, this_ptr=0x0, return_value_used=1)    at /...../php-5.6.6/ext/mydebug/mydebug.c:56然后输入: l显示：54      PHP_FUNCTION(confirm_mydebug_compiled)55      {56              char *arg = NULL;57              int arg_len, len;58              char *strg;5960              if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s", &arg, &arg_len) == FAILURE) {

<?phpecho confirm_mydebug_compiled("hello world");