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authorJani Taskinen <jani@php.net>2010-03-12 10:28:59 +0000
committerJani Taskinen <jani@php.net>2010-03-12 10:28:59 +0000
commitaf49e58f5155383a440041c77cc1ecbaf507fde7 (patch)
tree01ffe64d6f78450fb828f73d0e1e59f3cc7c8c76 /README.NEW-OUTPUT-API
parentea539c8b88c9278363b6de0b39446e4e8e043391 (diff)
downloadphp-git-af49e58f5155383a440041c77cc1ecbaf507fde7.tar.gz
- Reverted r296062 and r296065
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-$Id: README.NEW-OUTPUT-API 219039 2006-08-30 07:39:09Z mike $
-
-
-API adjustment to the old output control code:
-
- Everything now resides beneath the php_output namespace,
- and there's an API call for every output handler op.
-
- Checking output control layers status:
- // Using OG()
- php_output_get_status(TSRMLS_C);
-
- Starting the default output handler:
- // php_start_ob_buffer(NULL, 0, 1 TSRMLS_CC);
- php_output_start_default(TSRMLS_C);
-
- Starting an user handler by zval:
- // php_start_ob_buffer(zhandler, chunk_size, erase TSRMLS_CC);
- php_output_start_user(zhandler, chunk_size, flags TSRMLS_CC);
-
- Starting an internal handler whithout context:
- // php_ob_set_internal_handler(my_php_output_handler_func_t, buffer_size, "output handler name", erase TSRMLS_CC);
- php_output_start_internal(handler_name_zval, my_php_output_handler_func_t, chunk_size, flags TSRMLS_CC);
-
- Starting an internal handler with context:
- // not possible with old API
- php_output_handler *h;
- h = php_output_handler_create_internal(handler_name_zval, my_php_output_handler_context_func_t, chunk_size, flags TSRMLS_CC);
- php_output_handler_set_context(h, my_context, my_context_dtor);
- php_output_handler_start(h TSRMLS_CC);
-
- Testing whether a certain output handler has already been started:
- // php_ob_handler_used("output handler name" TSRMLS_CC);
- php_output_handler_started(handler_name_zval TSRMLS_CC);
-
- Flushing one output buffer:
- // php_ob_end_buffer(1, 1 TSRMLS_CC);
- php_output_flush(TSRMLS_C);
-
- Flushing all output buffers:
- // not possible with old API
- php_output_flush_all(TSRMLS_C);
-
- Cleaning one output buffer:
- // php_ob_end_buffer(0, 1 TSRMLS_CC);
- php_output_clean(TSRMLS_C);
-
- Cleaning all output buffers:
- // not possible with old API
- php_output_clean_all(TSRMLS_C);
-
- Discarding one output buffer:
- // php_ob_end_buffer(0, 0 TSRMLS_CC);
- php_output_discard(TSRMLS_C);
-
- Discarding all output buffers:
- // php_ob_end_buffers(0 TSRMLS_CC);
- php_output_discard_all(TSRMLS_C);
-
- Stopping (and dropping) one output buffer:
- // php_ob_end_buffer(1, 0 TSRMLS_CC)
- php_output_end(TSRMLS_C);
-
- Stopping (and dropping) all output buffers:
- // php_ob_end_buffers(1, 0 TSRMLS_CC);
- php_output_end_all(TSRMLS_C);
-
- Retrieving output buffers contents:
- // php_ob_get_buffer(zstring TSRMLS_CC);
- php_output_get_contents(zstring TSRMLS_CC);
-
- Retrieving output buffers length:
- // php_ob_get_length(zlength TSRMLS_CC);
- php_output_get_length(zlength TSRMLS_CC);
-
- Retrieving output buffering level:
- // OG(nesting_level);
- php_output_get_level(TSRMLS_C);
-
- Issue a warning because of an output handler conflict:
- // php_ob_init_conflict("to be started handler name", "to be tested if already started handler name" TSRMLS_CC);
- php_output_handler_conflict(new_handler_name_zval, set_handler_name_zval TSRMLS_CC);
-
- Registering a conflict checking function, which will be checked prior starting the handler:
- // not possible with old API, unless hardcoding into output.c
- php_output_handler_conflict_register(handler_name_zval, my_php_output_handler_conflict_check_t TSRMLS_CC);
-
- Registering a reverse conflict checking function, which will be checked prior starting the specified foreign handler:
- // not possible with old API
- php_output_handler_reverse_conflict_register(foreign_handler_name_zval, my_php_output_handler_conflict_check_t TSRMLS_CC);
-
- Facilitating a context from within an output handler callable with ob_start():
- // not possible with old API
- php_output_handler_hook(PHP_OUTPUT_HANDLER_HOOK_GET_OPAQ, (void *) &custom_ctx_ptr_ptr TSRMLS_CC);
-
- Disabling of the output handler by itself:
- //not possible with old API
- php_output_handler_hook(PHP_OUTPUT_HANDLER_HOOK_DISABLE, NULL TSRMLS_CC);
-
- Marking an output handler immutable by itself because of irreversibility of its operation:
- // not possible with old API
- php_output_handler_hook(PHP_OUTPUT_HANDLER_HOOK_IMMUTABLE, NULL TSRMLS_CC);
-
- Restarting the output handler because of a CLEAN operation:
- // not possible with old API
- if (flags & PHP_OUTPUT_HANDLER_CLEAN) { ... }
-
- Recognizing by the output handler itself if it gets discarded:
- // not possible with old API
- if ((flags & PHP_OUTPUT_HANDLER_CLEAN) && (flags & PHP_OUTPUT_HANDLER_FINAL)) { ... }
-
-
-Output handler hooks
-
- The output handler can change its abilities at runtime. Eg. the gz handler can
- remove the CLEANABLE and REMOVABLE bits when the first output has passed through it;
- or handlers implemented in C to be used with ob_start() can contain a non-global
- context:
- PHP_OUTPUT_HANDLER_HOOK_GET_OPAQ
- pass a void*** pointer as second arg to receive the address of a pointer
- pointer to the opaque field of the output handler context
- PHP_OUTPUT_HANDLER_HOOK_GET_FLAGS
- pass a int* pointer as second arg to receive the flags set for the output handler
- PHP_OUTPUT_HANDLER_HOOK_GET_LEVEL
- pass a int* pointer as second arg to receive the level of this output handler
- (starts with 0)
- PHP_OUTPUT_HANDLER_HOOK_IMMUTABLE
- the second arg is ignored; marks the output handler to be neither cleanable
- nor removable
- PHP_OUTPUT_HANDLER_HOOK_DISABLE
- the second arg is ignored; marks the output handler as disabled
-
-
-Open questions
-
- Should the userland API be adjusted and unified?
-
- Many bits of the manual (and very first implementation) do not comply
- with the behaviour of the current (to be obsoleted) code, thus should
- the manual or the behaviour be adjusted?
-
-END