1API adjustment to the old output control code: 2 3 Everything now resides beneath the php_output namespace, 4 and there's an API call for every output handler op. 5 6 Checking output control layers status: 7 // Using OG() 8 php_output_get_status(); 9 10 Starting the default output handler: 11 // php_start_ob_buffer(NULL, 0, 1); 12 php_output_start_default(); 13 14 Starting an user handler by zval: 15 // php_start_ob_buffer(zhandler, chunk_size, erase); 16 php_output_start_user(zhandler, chunk_size, flags); 17 18 Starting an internal handler without context: 19 // php_ob_set_internal_handler(my_php_output_handler_func_t, buffer_size, "output handler name", erase); 20 php_output_start_internal(handler_name, handler_name_len, my_php_output_handler_func_t, chunk_size, flags); 21 22 Starting an internal handler with context: 23 // not possible with old API 24 php_output_handler *h; 25 h = php_output_handler_create_internal(handler_name, handler_name_len, my_php_output_handler_context_func_t, chunk_size, flags); 26 php_output_handler_set_context(h, my_context, my_context_dtor); 27 php_output_handler_start(h); 28 29 Testing whether a certain output handler has already been started: 30 // php_ob_handler_used("output handler name"); 31 php_output_handler_started(handler_name, handler_name_len); 32 33 Flushing one output buffer: 34 // php_end_ob_buffer(1, 1); 35 php_output_flush(); 36 37 Flushing all output buffers: 38 // not possible with old API 39 php_output_flush_all(); 40 41 Cleaning one output buffer: 42 // php_ob_end_buffer(0, 1); 43 php_output_clean(); 44 45 Cleaning all output buffers: 46 // not possible with old API 47 php_output_clean_all(); 48 49 Discarding one output buffer: 50 // php_ob_end_buffer(0, 0); 51 php_output_discard(); 52 53 Discarding all output buffers: 54 // php_ob_end_buffers(0); 55 php_output_discard_all(); 56 57 Stopping (and dropping) one output buffer: 58 // php_ob_end_buffer(1, 0) 59 php_output_end(); 60 61 Stopping (and dropping) all output buffers: 62 // php_ob_end_buffers(1, 0); 63 php_output_end_all(); 64 65 Retrieving output buffers contents: 66 // php_ob_get_buffer(zstring); 67 php_output_get_contents(zstring); 68 69 Retrieving output buffers length: 70 // php_ob_get_length(zlength); 71 php_output_get_length(zlength); 72 73 Retrieving output buffering level: 74 // OG(nesting_level); 75 php_output_get_level(); 76 77 Issue a warning because of an output handler conflict: 78 // php_ob_init_conflict("to be started handler name", "to be tested if already started handler name"); 79 php_output_handler_conflict(new_handler_name, new_handler_name_len, set_handler_name, set_handler_name_len); 80 81 Registering a conflict checking function, which will be checked prior starting the handler: 82 // not possible with old API, unless hardcoding into output.c 83 php_output_handler_conflict_register(handler_name, handler_name_len, my_php_output_handler_conflict_check_t); 84 85 Registering a reverse conflict checking function, which will be checked prior starting the specified foreign handler: 86 // not possible with old API 87 php_output_handler_reverse_conflict_register(foreign_handler_name, foreign_handler_name_len, my_php_output_handler_conflict_check_t); 88 89 Facilitating a context from within an output handler callable with ob_start(): 90 // not possible with old API 91 php_output_handler_hook(PHP_OUTPUT_HANDLER_HOOK_GET_OPAQ, (void *) &custom_ctx_ptr_ptr); 92 93 Disabling of the output handler by itself: 94 //not possible with old API 95 php_output_handler_hook(PHP_OUTPUT_HANDLER_HOOK_DISABLE, NULL); 96 97 Marking an output handler immutable by itself because of irreversibility of its operation: 98 // not possible with old API 99 php_output_handler_hook(PHP_OUTPUT_HANDLER_HOOK_IMMUTABLE, NULL); 100 101 Restarting the output handler because of a CLEAN operation: 102 // not possible with old API 103 if (flags & PHP_OUTPUT_HANDLER_CLEAN) { ... } 104 105 Recognizing by the output handler itself if it gets discarded: 106 // not possible with old API 107 if ((flags & PHP_OUTPUT_HANDLER_CLEAN) && (flags & PHP_OUTPUT_HANDLER_FINAL)) { ... } 108 109 110Output handler hooks 111 112 The output handler can change its abilities at runtime. Eg. the gz handler can 113 remove the CLEANABLE and REMOVABLE bits when the first output has passed through it; 114 or handlers implemented in C to be used with ob_start() can contain a non-global 115 context: 116 PHP_OUTPUT_HANDLER_HOOK_GET_OPAQ 117 pass a void*** pointer as second arg to receive the address of a pointer 118 pointer to the opaque field of the output handler context 119 PHP_OUTPUT_HANDLER_HOOK_GET_FLAGS 120 pass a int* pointer as second arg to receive the flags set for the output handler 121 PHP_OUTPUT_HANDLER_HOOK_GET_LEVEL 122 pass a int* pointer as second arg to receive the level of this output handler 123 (starts with 0) 124 PHP_OUTPUT_HANDLER_HOOK_IMMUTABLE 125 the second arg is ignored; marks the output handler to be neither cleanable 126 nor removable 127 PHP_OUTPUT_HANDLER_HOOK_DISABLE 128 the second arg is ignored; marks the output handler as disabled 129 130 131Open questions 132 133 Should the userland API be adjusted and unified? 134 135 Many bits of the manual (and very first implementation) do not comply 136 with the behaviour of the current (to be obsoleted) code, thus should 137 the manual or the behaviour be adjusted? 138 139END 140
