A brief discussion of PHP source code 6: About the stream_get_wrappers function

This article mainly introduces a brief discussion of PHP source code 6: Regarding the stream_get_wrappers function, it has a certain reference value. Now I share it with you. Friends in need can refer to it

stream_get_wrappers

(PHP 5)

stream_get_wrappers — Returns a list of registered data streams
Description

array stream_get_wrappers (void)

Returns an indexed array containing the name of all stream wrappers available on the running system.

In the implementation process of other functions, it is necessary to know the source of the url_stream_wrappers_hash variable,
and thus find that this function also directly reads data from the url_stream_wrappers_hash variable,
So there is The tracking process for this function and the url_stream_wrappers_hash variable is completed.
First, the implementation of this extension is included in the streamsfuncs.c file under the standard folder.
The path is as follows:

   ==>PHP_FUNCTION(stream_get_wrappers)        //    streamsfuncs.c 548行
   ==>#define php_stream_get_url_stream_wrappers_hash() _php_stream_get_url_stream_wrappers_hash(TSRMLS_C)    //    php_stream.h    552行
   ==>PHPAPI HashTable *_php_stream_get_url_stream_wrappers_hash(TSRMLS_D)        //    streams/streams.c    58行
   ==>static HashTable url_stream_wrappers_hash;    //    全局静态变量，

From the code of this function, we can see that it directly traverses php_stream_get_url_stream_wrappers_hash( )The return value of the function generates a string array
php_stream_get_url_stream_wrappers_hash() function

The function directly calls the data in the global variable. The initialization and registration process of this variable is tracked as follows:

url_stream_wrappers_hash初始化位置：==>int php_init_stream_wrappers(int module_number TSRMLS_DC)    //    streams.c     1395行  初始化数据流引用位置：==> if (php_init_stream_wrappers(module_number TSRMLS_CC) == FAILURE)     //    main.c 1765行，初始化，注册数据流 
添加默认注册的流程如下：==> zend_startup_modules(TSRMLS_C);    //    main.c 1843行，添加注册数据流==>zend_hash_apply(&module_registry, (apply_func_t)zend_startup_module_ex TSRMLS_CC);    //    zend_API.c    1519行==>ZEND_API int zend_startup_module_ex(zend_module_entry *module TSRMLS_DC)    //    zend_API.c 1424行    ==>if (module->module_startup_func) {    //    zend_API.c    1470行==>PHP_MINIT_FUNCTION(basic)    //    basic_functions.c     3973行==> php_register_url_stream_wrapper("php", &php_stream_php_wrapper TSRMLS_CC);
 php_register_url_stream_wrapper("file", &php_plain_files_wrapper TSRMLS_CC);
 php_register_url_stream_wrapper("data", &php_stream_rfc2397_wrapper TSRMLS_CC);#ifndef PHP_CURL_URL_WRAPPERS
 php_register_url_stream_wrapper("http", &php_stream_http_wrapper TSRMLS_CC);
 php_register_url_stream_wrapper("ftp", &php_stream_ftp_wrapper TSRMLS_CC);#endif 
     //     basic_functions.c    4073行，添加过程==>php_register_url_stream_wrapper    //    main/streams/streams.c    1450行

The time span of this tracking was one week, which can be regarded as a lot of hardships. But finally the source was figured out.

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