php內(nèi)核分析之do-cli
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這里閱讀的php版本為PHP-7.1.0 RC3，閱讀代碼的平臺為linux
# main
把剩下的代碼增加了下注釋全部貼出來了(這個(gè)是簡化后的main函數(shù)，去掉了一些無關(guān)緊要的代碼段)：
int main(int argc, char *argv[])
{
...
sapi_module_struct *sapi_module = &cli_sapi_module;
argv = save_ps_args(argc, argv); /pic/p>
cli_sapi_module.additional_functions = additional_functions; /pic/p>
...
#ifdef ZTS
tsrm_startup(1, 1, 0, NULL);
(void)ts_resource(0);
ZEND_TSRMLS_CACHE_UPDATE();
#endif
zend_signal_startup(); /pic/p>
/pic/p>
while ((c = php_getopt(argc, argv, OPTIONS, &php_optarg, &php_optind, 0, 2))!=-1) {
switch (c) { /pic/p>
case 'c':
...
case 'n':
ini_ignore = 1; /pic/p>
break;
case 'd': { /pic/p>
...
}
case 'h': /* help & quit */
case '?':
php_cli_usage(argv[0]);
goto out;
case 'i': case 'v': case 'm':
sapi_module = &cli_sapi_module;
goto exit_loop;
case 'e': /* enable extended info output */
use_extended_info = 1;
break;
}
}
exit_loop:
sapi_module->ini_defaults = sapi_cli_ini_defaults; /pic/p>
sapi_module->php_ini_path_override = ini_path_override; /pic/p>
sapi_module->phpinfo_as_text = 1; /pic/p>
sapi_module->php_ini_ignore_cwd = 1; /pic/p>
sapi_startup(sapi_module); /pic/p>
sapi_started = 1; /pic/p>
...
/pic/p>
if (sapi_module->startup(sapi_module) == FAILURE) {
exit_status = 1;
goto out;
}
module_started = 1; /pic/p>
...
zend_first_try {
exit_status = do_cli(argc, argv); /pic/p>
} zend_end_try();
out: /pic/p>
if (ini_path_override) {
free(ini_path_override);
}
if (ini_entries) {
free(ini_entries);
}
if (module_started) {
php_module_shutdown();
}
if (sapi_started) {
sapi_shutdown();
}
#ifdef ZTS
tsrm_shutdown();
#endif
cleanup_ps_args(argv);
exit(exit_status);
}
其實(shí)看偽碼很簡單：
tsrm_startup(1, 1, 0, NULL); /pic/p>
zend_signal_startup(); /pic/p>
sapi_startup(sapi_module); /pic/p>
sapi_module->startup(sapi_module); /pic/p>
do_cli(argc, argv); /pic/p>
php_module_shutdown(); /pic/p>
sapi_shutdown(); /pic/p>
tsrm_shutdown(); /pic/p>
好了，其實(shí)看了一圈，里面最重的函數(shù)是do_cli了。
php參數(shù)
do_cli里面你會看到根據(jù)參數(shù)的不同，有很多分支，這里你就需要了解這些參數(shù)都是什么用的。
參數(shù)
作用
實(shí)例
do_cli
我們把do_cli函數(shù)的整個(gè)函數(shù)去掉多余代碼，僅保留關(guān)鍵代碼如下：
static int do_cli(int argc, char **argv)
{
...
zend_try {
/pic/ v-輸出php版本 / m-輸出擴(kuò)展信息
while ((c = php_getopt(argc, argv, OPTIONS, &php_optarg, &php_optind, 0, 2)) != -1) {
switch (c) {
case 'i': /pic/p>
...
php_print_info(0xFFFFFFFF);
...
goto out;
case 'v': /pic/p>
...
get_zend_version()
...
goto out;
case 'm': /pic/p>
...
print_extensions();
...
goto out;
default:
break;
}
}
...
/pic/p>
/pic/p>
/pic/p>
while ((c = php_getopt(argc, argv, OPTIONS, &php_optarg, &php_optind, 0, 2)) != -1) {
switch (c) {
case 'a': /pic/p>
...
interactive=1;
...
break;
case 'C': /pic/p>
break;
case 'F': /pic/p>
...
behavior=PHP_MODE_PROCESS_STDIN;
script_file = php_optarg;
break;
case 'f': /pic/p>
...
script_file = php_optarg;
break;
case 'l': /pic/p>
...
behavior=PHP_MODE_LINT;
break;
case 'q': /pic/p>
break;
case 'r': /pic/p>
...
behavior=PHP_MODE_CLI_DIRECT;
exec_direct=php_optarg;
break;
case 'R': /pic/p>
...
behavior=PHP_MODE_PROCESS_STDIN;
exec_run=php_optarg;
break;
case 'B': /pic/p>
...
behavior=PHP_MODE_PROCESS_STDIN;
exec_begin=php_optarg;
break;
case 'E': /pic/p>
...
behavior=PHP_MODE_PROCESS_STDIN;
exec_end=php_optarg;
break;
case 's': /pic/p>
...
behavior=PHP_MODE_HIGHLIGHT;
break;
case 'w': /pic/p>
...
behavior=PHP_MODE_STRIP;
break;
case 'z': /pic/p>
zend_load_extension(php_optarg);
break;
case 'H': /pic/p>
hide_argv = 1;
break;
case 10: /pic/p>
behavior=PHP_MODE_REFLECTION_FUNCTION;
reflection_what = php_optarg;
break;
case 11: /pic/p>
behavior=PHP_MODE_REFLECTION_CLASS;
reflection_what = php_optarg;
break;
case 12: /pic/p>
behavior=PHP_MODE_REFLECTION_EXTENSION;
reflection_what = php_optarg;
break;
case 13: /pic/p>
behavior=PHP_MODE_REFLECTION_ZEND_EXTENSION;
reflection_what = php_optarg;
break;
case 14: /pic/p>
behavior=PHP_MODE_REFLECTION_EXT_INFO;
reflection_what = php_optarg;
break;
case 15: /pic/p>
behavior = PHP_MODE_SHOW_INI_CONFIG;
break;
default:
break;
}
}
...
/pic/p>
if (php_request_startup()==FAILURE) {
...
goto err;
}
...
zend_is_auto_global_str(ZEND_STRL("_SERVER"));
/pic/p>
switch (behavior) {
case PHP_MODE_STANDARD: /pic/p>
...
php_execute_script(&file_handle);
...
break;
case PHP_MODE_LINT: /pic/p>
exit_status = php_lint_script(&file_handle);
...
break;
case PHP_MODE_STRIP:
...
zend_strip();
...
break;
case PHP_MODE_HIGHLIGHT:
...
php_get_highlight_struct(&syntax_highlighter_ini);
zend_highlight(&syntax_highlighter_ini);
goto out;
break;
case PHP_MODE_CLI_DIRECT:
...
if (zend_eval_string_ex(exec_direct, NULL, "Command line code", 1) == FAILURE) {
exit_status=254;
}
break;
case PHP_MODE_PROCESS_STDIN:
...
zend_eval_string_ex(exec_end, NULL, "Command line end code", 1)
...
break;
case PHP_MODE_REFLECTION_FUNCTION:
case PHP_MODE_REFLECTION_CLASS:
case PHP_MODE_REFLECTION_EXTENSION:
case PHP_MODE_REFLECTION_ZEND_EXTENSION:
...
ZVAL_STRING(&arg, reflection_what);
object_init_ex(&ref, pce);
...
zend_call_method_with_1_params(&ref, pce, &pce->constructor, "__construct", NULL, &arg);
...
break;
case PHP_MODE_REFLECTION_EXT_INFO:
...
if ((module = zend_hash_str_find_ptr(&module_registry, lcname, len)) == NULL) {
...
display_ini_entries(NULL);
...
}
...
break;
case PHP_MODE_SHOW_INI_CONFIG:
...
break;
}
} zend_end_try();
out:
...
err:
...
}
整個(gè)200行的代碼就很好理解了，整個(gè)是包在一個(gè)zend_try...zend_catch中的。做了幾步：
處理-i, -m, -v參數(shù)
對其他的參數(shù)設(shè)置behavior，script_file等變量
根據(jù)behavior做不同的行為
回到我們的初步計(jì)劃，我們想要了解的事：
我們的根據(jù)-r的參數(shù)配置尋找。
它實(shí)際上時(shí)調(diào)用了
zend_eval_string_ex(exec_direct, NULL, "Command line code", 1)
這里的exec_direct是 echo 12字符串
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