php运行生命周期--模块初始化php_module_startup

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发布于 2020-09-07 15:33:18

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发布于 2020-09-07 15:33:18

文章被收录于专栏：golang+phpgolang+php

php_module_startup过程调用图如下

php_module_startup.png

1、sapi_initialize_request_empty函数

// main/SAPI.cSAPI_API void sapi_initialize_empty_request(void){
    SG(server_context) = NULL;
    SG(request_info).request_method = NULL;
    SG(request_info).auth_digest = SG(request_info).auth_user = SG(request_info).auth_password = NULL;
    SG(request_info).content_type_dup = NULL;
}

这个函数主要为前面定义的SG宏中的成员变量进行初始化。

2、sapi_activate函数

// main/SAPI.cSAPI_API void sapi_activate(void){
    zend_llist_init(&SG(sapi_headers).headers, sizeof(sapi_header_struct), (void (*)(void *)) sapi_free_header, 0);
    SG(sapi_headers).send_default_content_type = 1;    /*
    SG(sapi_headers).http_response_code = 200;
    */
    SG(sapi_headers).http_status_line = NULL;
    SG(sapi_headers).mimetype = NULL;
    SG(headers_sent) = 0;
    ZVAL_UNDEF(&SG(callback_func));
    SG(read_post_bytes) = 0;
    SG(request_info).request_body = NULL;
    SG(request_info).current_user = NULL;
    SG(request_info).current_user_length = 0;
    SG(request_info).no_headers = 0;
    SG(request_info).post_entry = NULL;
    SG(request_info).proto_num = 1000; /* Default to HTTP 1.0 */
    SG(global_request_time) = 0;
    SG(post_read) = 0;    /* It's possible to override this general case in the activate() callback, if necessary. */
    if (SG(request_info).request_method && !strcmp(SG(request_info).request_method, "HEAD")) {
        SG(request_info).headers_only = 1;
    } else {
        SG(request_info).headers_only = 0;
    }
    SG(rfc1867_uploaded_files) = NULL;    /* Handle request method */
    if (SG(server_context)) {        if (PG(enable_post_data_reading)
        &&  SG(request_info).content_type
        &&  SG(request_info).request_method
        && !strcmp(SG(request_info).request_method, "POST")) {            /* HTTP POST may contain form data to be processed into variables
             * depending on given content type */
            sapi_read_post_data();
        } else {
            SG(request_info).content_type_dup = NULL;
        }        /* Cookies */
        SG(request_info).cookie_data = sapi_module.read_cookies();        if (sapi_module.activate) {
            sapi_module.activate();
        }
    }    if (sapi_module.input_filter_init) {
        sapi_module.input_filter_init();
    }
}

函数的前半部分主要还是对SG宏的成员变量进行初始化。后半部分先是调用了sapi_module_struct内部实现的activate函数，又调用了input_filter_init函数，但是在CLI模式并没有实现这两个函数，只是返回了NULL。代码如下：

NULL,                           /* activate */

3、php_output_startup函数

//main/output.cPHPAPI void php_output_startup(void){
    ZEND_INIT_MODULE_GLOBALS(output, php_output_init_globals, NULL);
    zend_hash_init(&php_output_handler_aliases, 8, NULL, NULL, 1);
    zend_hash_init(&php_output_handler_conflicts, 8, NULL, NULL, 1);
    zend_hash_init(&php_output_handler_reverse_conflicts, 8, NULL, reverse_conflict_dtor, 1);
    php_output_direct = php_output_stdout;
}

我们先来看ZEND_INIT_MODULE_GLOBALS宏做了什么事情：

#define ZEND_INIT_MODULE_GLOBALS(module_name, globals_ctor, globals_dtor)   \
    globals_ctor(&module_name##_globals);

由代码得知，该宏只是做了一层替换，替换后的内容为：

php_output_init_globals(&output_globals);

那php_output_init_globals函数又做了什么呢？

//main/output.cstatic inline void php_output_init_globals(zend_output_globals *G){
    ZEND_TSRMLS_CACHE_UPDATE();    memset(G, 0, sizeof(*G));
}

该函数通过memset函数对output_globals进行了内存相关的初始化，我们可以在main/php_output.h中的155行找到它的宏定义OG。

//main/php_output.h# define OG(v) (output_globals.v)

OG对应的结构体是php_output_init_globals的入参zend_output_globals，在这里花了些时间，因为没找到定义在哪里，最后发现它也是通过宏定义替换得来的，代码如下：

//main/php_output.hZEND_BEGIN_MODULE_GLOBALS(output)
    zend_stack handlers;
    php_output_handler *active;
    php_output_handler *running;    const char *output_start_filename;    int output_start_lineno;    int flags;
ZEND_END_MODULE_GLOBALS(output)

看似是定义了一个结构体，但是代码中又出现了两个宏，我们再来瞅瞅这两个宏是干嘛的：

//Zend/zend_API.h#define ZEND_BEGIN_MODULE_GLOBALS(module_name)      \
    typedef struct _zend_##module_name##_globals {#define ZEND_END_MODULE_GLOBALS(module_name)        \
    } zend_##module_name##_globals;

原来只是做了个替换而已，替换后的代码如下：

//这个是意淫出来的代码typedef struct _zend_output_globals {
    zend_stack handlers;
    php_output_handler *active;
    php_output_handler *running;    const char *output_start_filename;    int output_start_lineno;    int flags;
} zend_output_globals

这才是zend_output_globals最纯粹的定义，写的很是骚气，差点看断片。这样看来我们的OG宏对应的就是这个结构体了，姑且认为它是PHP输出相关的结构体。我们继续往下看：

zend_hash_init(&php_output_handler_aliases, 8, NULL, NULL, 1);
zend_hash_init(&php_output_handler_conflicts, 8, NULL, NULL, 1);
zend_hash_init(&php_output_handler_reverse_conflicts, 8, NULL, reverse_conflict_dtor, 1);
php_output_direct = php_output_stdout;

接下来又对三个HashTable进行了初始化，初始化完成后，将php_output_direct指针指向了php_output_stdout函数。php_output_stdout函数的作用是调用fwrite函数，输出字符串到stdout中。代码如下：

//main/output.cstatic size_t php_output_stdout(const char *str, size_t str_len){
    fwrite(str, 1, str_len, stdout);    return str_len;
}

4、php_startup_ticks函数

int php_startup_ticks(void){
    zend_llist_init(&PG(tick_functions), sizeof(struct st_tick_function), NULL, 1);    return SUCCESS;
}

这里又出现了一个PG宏，来看下它的定义

define PG(v) (core_globals.v)

PG对应的结构体是core_globals，core_globals又对应_php_core_globals，代码如下

extern ZEND_API struct _php_core_globals core_globals;

php_core_globals顾名思义，就是php核心的全局变量，定义很多PHP相关的参数，比如内存上限、是否显示错误信息、上传文件大小限制、输入输出编码、禁用的函数等等，这里不再赘述，感兴趣的同学可以去看一下源码。

//main/php_globals.hstruct _php_core_globals {
    zend_bool implicit_flush;

    zend_long output_buffering;

    zend_bool sql_safe_mode;
    zend_bool enable_dl;    char *output_handler;    char *unserialize_callback_func;
    zend_long serialize_precision;

    zend_long memory_limit;
    zend_long max_input_time;

    zend_bool track_errors;
    zend_bool display_errors;
    zend_bool display_startup_errors;
    zend_bool log_errors;
    zend_long      log_errors_max_len;
    zend_bool ignore_repeated_errors;
    zend_bool ignore_repeated_source;
    zend_bool report_memleaks;    char *error_log;    char *doc_root;    char *user_dir;    char *include_path;    char *open_basedir;    char *extension_dir;    char *php_binary;    char *sys_temp_dir;    char *upload_tmp_dir;
    zend_long upload_max_filesize;    char *error_append_string;    char *error_prepend_string;    char *auto_prepend_file;    char *auto_append_file;    char *input_encoding;    char *internal_encoding;    char *output_encoding;

    arg_separators arg_separator;    char *variables_order;

    HashTable rfc1867_protected_variables;    short connection_status;    short ignore_user_abort;    unsigned char header_is_being_sent;

    zend_llist tick_functions;

    zval http_globals[6];

    zend_bool expose_php;

    zend_bool register_argc_argv;
    zend_bool auto_globals_jit;    char *docref_root;    char *docref_ext;

    zend_bool html_errors;
    zend_bool xmlrpc_errors;

    zend_long xmlrpc_error_number;

    zend_bool activated_auto_globals[8];

    zend_bool modules_activated;
    zend_bool file_uploads;
    zend_bool during_request_startup;
    zend_bool allow_url_fopen;
    zend_bool enable_post_data_reading;
    zend_bool report_zend_debug;    int last_error_type;    char *last_error_message;    char *last_error_file;    int  last_error_lineno;    char *php_sys_temp_dir;    char *disable_functions;    char *disable_classes;
    zend_bool allow_url_include;
    zend_bool exit_on_timeout;#ifdef PHP_WIN32
    zend_bool com_initialized;#endif
    zend_long max_input_nesting_level;
    zend_long max_input_vars;
    zend_bool in_user_include;    char *user_ini_filename;
    zend_long user_ini_cache_ttl;    char *request_order;

    zend_bool mail_x_header;    char *mail_log;

    zend_bool in_error_log;#ifdef PHP_WIN32
    zend_bool windows_show_crt_warning;#endif};

而php_startup_ticks函数就是对PG宏的成员变量tick_functions进行初始化。

5、gc_globals_ctor函数

ZEND_API void gc_globals_ctor(void){
    gc_globals_ctor_ex(&gc_globals);
}

这里又出现了一个gc_globals，PHP的全局变量就是多啊，在这里我们只要先记住它是PHP垃圾回收相关的结构体即可，后面我们做详细介绍。这段代码是对gc_globals进行初始化。

//Zend/zend_gc.ctypedef struct _zend_gc_globals {
    zend_bool         gc_enabled;
    zend_bool         gc_active;
    zend_bool         gc_full;

    gc_root_buffer   *buf;              /* preallocated arrays of buffers   */
    gc_root_buffer    roots;            /* list of possible roots of cycles */
    gc_root_buffer   *unused;           /* list of unused buffers           */
    gc_root_buffer   *first_unused;     /* pointer to first unused buffer   */
    gc_root_buffer   *last_unused;      /* pointer to last unused buffer    */

    gc_root_buffer    to_free;          /* list to free                     */
    gc_root_buffer   *next_to_free;    uint32_t gc_runs;    uint32_t collected;#if GC_BENCH
    uint32_t root_buf_length;    uint32_t root_buf_peak;    uint32_t zval_possible_root;    uint32_t zval_buffered;    uint32_t zval_remove_from_buffer;    uint32_t zval_marked_grey;#endif} zend_gc_globals;

6、zend_startup函数 6.1、start_memory_manager 初始化内存管理器，对结构体alloc_globals进行初始化。

//Zend/zend_alloc.cstatic void alloc_globals_ctor(zend_alloc_globals *alloc_globals){#if ZEND_MM_CUSTOM
    char *tmp = getenv("USE_ZEND_ALLOC");    if (tmp && !zend_atoi(tmp, 0)) {
        alloc_globals->mm_heap = malloc(sizeof(zend_mm_heap));        memset(alloc_globals->mm_heap, 0, sizeof(zend_mm_heap));
        alloc_globals->mm_heap->use_custom_heap = ZEND_MM_CUSTOM_HEAP_STD;
        alloc_globals->mm_heap->custom_heap.std._malloc = __zend_malloc;
        alloc_globals->mm_heap->custom_heap.std._free = free;
        alloc_globals->mm_heap->custom_heap.std._realloc = __zend_realloc;        return;
    }#endif#ifdef MAP_HUGETLB
    tmp = getenv("USE_ZEND_ALLOC_HUGE_PAGES");    if (tmp && zend_atoi(tmp, 0)) {
        zend_mm_use_huge_pages = 1;
    }#endif
    ZEND_TSRMLS_CACHE_UPDATE();
    alloc_globals->mm_heap = zend_mm_init();
}

6.2、virtual_cwd_startup virtual_cwd_startup初始化了cwd_globals，根据源码可以看出成员变量都与realpath_cache有关，realpath_cache是什么呢？我们平时在写代码的时候，经常会使用include、include_once、require、require_once等语句导入文件，如果每次使用这些语句都要去对应的目录中寻找目标文件，势必会降低性能，所以官方加入了缓存，以便PHP再次使用时不必到include_path中查找，加快PHP的执行速度。

//Zend/zend_virtual_cwd.ctypedef struct _virtual_cwd_globals {
    cwd_state cwd;
    zend_long                   realpath_cache_size;
    zend_long                   realpath_cache_size_limit;
    zend_long                   realpath_cache_ttl;
    realpath_cache_bucket *realpath_cache[1024];
} virtual_cwd_globals;

6.3、zend_startup_extensions_mechanism 启动扩展机制，初始化zend_extensions结构体

int zend_startup_extensions_mechanism(){    /* Startup extensions mechanism */
    zend_llist_init(&zend_extensions, sizeof(zend_extension), (void (*)(void *)) zend_extension_dtor, 1);
    last_resource_number = 0;    return SUCCESS;
}

6.4、提供编译与执行入口

zend_compile_file = compile_file;
zend_execute_ex = execute_ex;

6.5、zend_init_opcodes_handlers 初始化Zend虚拟机的handler

6.6、初始化CG、EG 初始化CG(function_table)、CG(class_table)、CG(auto_globals)、EG(zend_constants)，这里不再赘述，我们后续讲解。

GLOBAL_FUNCTION_TABLE = (HashTable *) malloc(sizeof(HashTable));
GLOBAL_CLASS_TABLE = (HashTable *) malloc(sizeof(HashTable));
GLOBAL_AUTO_GLOBALS_TABLE = (HashTable *) malloc(sizeof(HashTable));
GLOBAL_CONSTANTS_TABLE = (HashTable *) malloc(sizeof(HashTable));

6.7、ini_scanner_globals_ctor 初始化ini_scanner_globals

6.8、php_scanner_globals_ctor 初始化language_scanner_globals

6.9、zend_set_default_compile_time_values 设置了编译相关的配置

//Zend/zend.cstatic void zend_set_default_compile_time_values(void) /* {{{ */{    /* default compile-time values */
    CG(short_tags) = short_tags_default;
    CG(compiler_options) = compiler_options_default;
}

6.10、EG(error_reporting) = E_ALL & ~E_NOTICE; EG宏就是executor_globals，Zend执行器相关的全局变量，在这里对我们熟知的error_reporting进行配置。

//Zend/zend_globals.hstruct _zend_executor_globals {
    zval uninitialized_zval;
    zval error_zval;    /* symbol table cache */
    zend_array *symtable_cache[SYMTABLE_CACHE_SIZE];
    zend_array **symtable_cache_limit;
    zend_array **symtable_cache_ptr;
    ......
}

6.11、zend_interned_strings_init 初始化内部字符串

//Zend/zend_string.cvoid zend_interned_strings_init(void){#ifndef ZTS
    zend_string *str;

    zend_hash_init(&CG(interned_strings), 1024, NULL, _str_dtor, 1);
    ......
}

6.12、zend_startup_builtin_functions 初始化内部函数

//Zend/zend_builtin_functions.cint zend_startup_builtin_functions(void) /* {{{ */{
    zend_builtin_module.module_number = 0;
    zend_builtin_module.type = MODULE_PERSISTENT;    return (EG(current_module) = zend_register_module_ex(&zend_builtin_module)) == NULL ? FAILURE : SUCCESS;
}

6.13、zend_register_standard_constants 注册常量，比如E_ERROR、E_WARNING、E_NOTICE、E_CORE_ERROR等。

//Zend/zend_constants.cvoid zend_register_standard_constants(void){
    REGISTER_MAIN_LONG_CONSTANT("E_ERROR", E_ERROR, CONST_PERSISTENT | CONST_CS);
    REGISTER_MAIN_LONG_CONSTANT("E_RECOVERABLE_ERROR", E_RECOVERABLE_ERROR, CONST_PERSISTENT | CONST_CS);
    REGISTER_MAIN_LONG_CONSTANT("E_WARNING", E_WARNING, CONST_PERSISTENT | CONST_CS);
    ......
}

6.14、zend_register_auto_global 将GLOBALS加入CG(auto_globals)

//Zend/zend.czend_register_auto_global(zend_string_init("GLOBALS", sizeof("GLOBALS") - 1, 1), 1, php_auto_globals_create_globals);

6.15、zend_init_rsrc_plist 初始化持久化符号表

int zend_init_rsrc_plist(void){
    zend_hash_init_ex(&EG(persistent_list), 8, NULL, plist_entry_destructor, 1, 0);    return SUCCESS;
}

6.16、zend_init_exception_op 初始化EG(exception_op)

6.17、zend_init_call_trampoline_op 初始化EG(call_trampoline_op)

6.18、zend_ini_startup 初始化与php.ini解析相关的变量

//Zend/zend_ini.cZEND_API int zend_ini_startup(void) /* {{{ */{
    registered_zend_ini_directives = (HashTable *) malloc(sizeof(HashTable));

    EG(ini_directives) = registered_zend_ini_directives;
    EG(modified_ini_directives) = NULL;
    EG(error_reporting_ini_entry) = NULL;
    zend_hash_init_ex(registered_zend_ini_directives, 128, NULL, free_ini_entry, 1, 0);    return SUCCESS;
}

7、zend_register_list_destructors_ex函数初始化析构函数

//Zend/zend_list.cZEND_API int zend_register_list_destructors_ex(rsrc_dtor_func_t ld, rsrc_dtor_func_t pld, const char *type_name, int module_number){
    zend_rsrc_list_dtors_entry *lde;
    zval zv;

    lde = malloc(sizeof(zend_rsrc_list_dtors_entry));
    lde->list_dtor_ex = ld;
    lde->plist_dtor_ex = pld;
    lde->module_number = module_number;
    lde->resource_id = list_destructors.nNextFreeElement;
    lde->type_name = type_name;
    ZVAL_PTR(&zv, lde);    if (zend_hash_next_index_insert(&list_destructors, &zv) == NULL) {        return FAILURE;
    }    return list_destructors.nNextFreeElement-1;
}

8、php_binary_init函数获取PHP执行的二进制路径

static void php_binary_init(void){    char *binary_location;#ifdef PHP_WIN32
    binary_location = (char *)malloc(MAXPATHLEN);    if (GetModuleFileName(0, binary_location, MAXPATHLEN) == 0) {        free(binary_location);
        PG(php_binary) = NULL;
    }#else
    if (sapi_module.executable_location) {
        binary_location = (char *)malloc(MAXPATHLEN);        if (!strchr(sapi_module.executable_location, '/')) {            char *envpath, *path;            int found = 0;
            ......
}

9、php_output_register_constants函数初始化输出相关的预定义常量

//main/output.cPHPAPI void php_output_register_constants(void){
    REGISTER_MAIN_LONG_CONSTANT("PHP_OUTPUT_HANDLER_START", PHP_OUTPUT_HANDLER_START, CONST_CS | CONST_PERSISTENT);
    REGISTER_MAIN_LONG_CONSTANT("PHP_OUTPUT_HANDLER_WRITE", PHP_OUTPUT_HANDLER_WRITE, CONST_CS | CONST_PERSISTENT);
    REGISTER_MAIN_LONG_CONSTANT("PHP_OUTPUT_HANDLER_FLUSH", PHP_OUTPUT_HANDLER_FLUSH, CONST_CS | CONST_PERSISTENT);
    REGISTER_MAIN_LONG_CONSTANT("PHP_OUTPUT_HANDLER_CLEAN", PHP_OUTPUT_HANDLER_CLEAN, CONST_CS | CONST_PERSISTENT);
    REGISTER_MAIN_LONG_CONSTANT("PHP_OUTPUT_HANDLER_FINAL", PHP_OUTPUT_HANDLER_FINAL, CONST_CS | CONST_PERSISTENT);
    REGISTER_MAIN_LONG_CONSTANT("PHP_OUTPUT_HANDLER_CONT", PHP_OUTPUT_HANDLER_WRITE, CONST_CS | CONST_PERSISTENT);
    REGISTER_MAIN_LONG_CONSTANT("PHP_OUTPUT_HANDLER_END", PHP_OUTPUT_HANDLER_FINAL, CONST_CS | CONST_PERSISTENT);

    REGISTER_MAIN_LONG_CONSTANT("PHP_OUTPUT_HANDLER_CLEANABLE", PHP_OUTPUT_HANDLER_CLEANABLE, CONST_CS | CONST_PERSISTENT);
    REGISTER_MAIN_LONG_CONSTANT("PHP_OUTPUT_HANDLER_FLUSHABLE", PHP_OUTPUT_HANDLER_FLUSHABLE, CONST_CS | CONST_PERSISTENT);
    REGISTER_MAIN_LONG_CONSTANT("PHP_OUTPUT_HANDLER_REMOVABLE", PHP_OUTPUT_HANDLER_REMOVABLE, CONST_CS | CONST_PERSISTENT);
    REGISTER_MAIN_LONG_CONSTANT("PHP_OUTPUT_HANDLER_STDFLAGS", PHP_OUTPUT_HANDLER_STDFLAGS, CONST_CS | CONST_PERSISTENT);
    REGISTER_MAIN_LONG_CONSTANT("PHP_OUTPUT_HANDLER_STARTED", PHP_OUTPUT_HANDLER_STARTED, CONST_CS | CONST_PERSISTENT);
    REGISTER_MAIN_LONG_CONSTANT("PHP_OUTPUT_HANDLER_DISABLED", PHP_OUTPUT_HANDLER_DISABLED, CONST_CS | CONST_PERSISTENT);
}

10、php_rfc1867_register_constants函数注册文件上传相关的预定义常量

//main/rfc1867.cvoid php_rfc1867_register_constants(void) /* {{{ */{
    REGISTER_MAIN_LONG_CONSTANT("UPLOAD_ERR_OK",         UPLOAD_ERROR_OK, CONST_CS | CONST_PERSISTENT);
    REGISTER_MAIN_LONG_CONSTANT("UPLOAD_ERR_INI_SIZE",   UPLOAD_ERROR_A,  CONST_CS | CONST_PERSISTENT);
    REGISTER_MAIN_LONG_CONSTANT("UPLOAD_ERR_FORM_SIZE",  UPLOAD_ERROR_B,  CONST_CS | CONST_PERSISTENT);
    REGISTER_MAIN_LONG_CONSTANT("UPLOAD_ERR_PARTIAL",    UPLOAD_ERROR_C,  CONST_CS | CONST_PERSISTENT);
    REGISTER_MAIN_LONG_CONSTANT("UPLOAD_ERR_NO_FILE",    UPLOAD_ERROR_D,  CONST_CS | CONST_PERSISTENT);
    REGISTER_MAIN_LONG_CONSTANT("UPLOAD_ERR_NO_TMP_DIR", UPLOAD_ERROR_E,  CONST_CS | CONST_PERSISTENT);
    REGISTER_MAIN_LONG_CONSTANT("UPLOAD_ERR_CANT_WRITE", UPLOAD_ERROR_F,  CONST_CS | CONST_PERSISTENT);
    REGISTER_MAIN_LONG_CONSTANT("UPLOAD_ERR_EXTENSION",  UPLOAD_ERROR_X,  CONST_CS | CONST_PERSISTENT);
}

11、php_init_config函数初始化配置文件php.ini，并通过zend_parse_ini_file解析。

12、zend_register_standard_ini_entries函数初始化ini相关的变量

void zend_register_standard_ini_entries(void) /* {{{ */{    int module_number = 0;

    REGISTER_INI_ENTRIES();
}

13、php_startup_auto_globals函数注册我们熟知的全局变量

_POST、$_COOKIE等等

//main/php_variables.cvoid php_startup_auto_globals(void){
    zend_register_auto_global(zend_string_init("_GET", sizeof("_GET")-1, 1), 0, php_auto_globals_create_get);
    zend_register_auto_global(zend_string_init("_POST", sizeof("_POST")-1, 1), 0, php_auto_globals_create_post);
    zend_register_auto_global(zend_string_init("_COOKIE", sizeof("_COOKIE")-1, 1), 0, php_auto_globals_create_cookie);
    zend_register_auto_global(zend_string_init("_SERVER", sizeof("_SERVER")-1, 1), PG(auto_globals_jit), php_auto_globals_create_server);
    zend_register_auto_global(zend_string_init("_ENV", sizeof("_ENV")-1, 1), PG(auto_globals_jit), php_auto_globals_create_env);
    zend_register_auto_global(zend_string_init("_REQUEST", sizeof("_REQUEST")-1, 1), PG(auto_globals_jit), php_auto_globals_create_request);
    zend_register_auto_global(zend_string_init("_FILES", sizeof("_FILES")-1, 1), 0, php_auto_globals_create_files);
}

14、php_startup_sapi_content_types函数初始化针对不同内容类型的处理函数

//main/php_content_types.cint php_startup_sapi_content_types(void){
    sapi_register_default_post_reader(php_default_post_reader);
    sapi_register_treat_data(php_default_treat_data);
    sapi_register_input_filter(php_default_input_filter, NULL);    return SUCCESS;
}

15、php_register_internal_extensions_func函数注册内部扩展函数

16、php_register_extensions_bc函数注册PHP的附加扩展

17、zend_startup_modules函数启动Zend模块

18、zend_startup_extensions函数启动Zend扩展

19、php_disable_functions函数对PHP的禁用函数进行设置

static void php_disable_functions(void){    char *s = NULL, *e;    if (!*(INI_STR("disable_functions"))) {        return;
    }

    e = PG(disable_functions) = strdup(INI_STR("disable_functions"));    if (e == NULL) {        return;
    }    while (*e) {        switch (*e) {            case ' ':            case ',':                if (s) {
                    *e = '\0';
                    zend_disable_function(s, e-s);
                    s = NULL;
                }                break;            default:                if (!s) {
                    s = e;
                }                break;
        }
        e++;
    }    if (s) {
        zend_disable_function(s, e-s);
    }
}

20、php_disable_classes函数对PHP的禁用类进行设置

static void php_disable_classes(void){    char *s = NULL, *e;    if (!*(INI_STR("disable_classes"))) {        return;
    }

    e = PG(disable_classes) = strdup(INI_STR("disable_classes"));    while (*e) {        switch (*e) {            case ' ':            case ',':                if (s) {
                    *e = '\0';
                    zend_disable_class(s, e-s);
                    s = NULL;
                }                break;            default:                if (!s) {
                    s = e;
                }                break;
        }
        e++;
    }    if (s) {
        zend_disable_class(s, e-s);
    }
}

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