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PHP Extension Writing
71
Börger, Schlüter
Storing Global Values
þ
Do NOT store transient data in the global scope!
þ Threaded SAPIs willbreak
static char *errormsg = NULL;
PHP_FUNCTION(yourext_unthreadsafe) {
long ret;
ret = do_something("value", &errormsg);
if (errormsg) {
php_error_docref(NULL TSRMLS_CC, E_WARNING,
"do_something() failed with: %s", errormsg);
free(errormsg);
errormsg = NULL;
}
}
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PHP Extension Writing
72
Börger, Schlüter
ZEND_BEGIN_MODULE_GLOBALS(yourext)
char
*str;
int
strlen;
long
counter;
ZEND_END_MODULE_GLOBALS(yourext)
#ifdef ZTS
# define YOUREXT_G(v) \
TSRMG(yourext_globals_id, zend_yourext_globals*, v)
extern int yourext_globals_id;
#else
# define YOUREXT_G(v) (yourext_globals.v)
extern zend_yourext_globals yourext_globals;
#endif 
Global struct in .h
þ
Provide a structure and access macros
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PHP Extension Writing
73
Börger, Schlüter
ZEND_DECLARE_MODULE_GLOBALS(yourext)
static void yourext_globals_ctor(
zend_yourext_globals *globals) {
/* Initialize your global struct */
globals->str     = NULL;
globals->strlen  = 0;
globals->counter = 0
;
}
static void yourext_globals_dtor(
zend_yourext_globals *globals) {
/* Clean up any allocated globals */
}
Global Handling in .c
þ
Provide the storage/id and ctor/dtor functions
þ Initializer called once at (thread) startup
þ Destructor called once at (thread) shutdown
þ Allocations made here must be persistent (malloc’d)
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PHP Extension Writing
74
Börger, Schlüter
MINIT/MSHUTDOWN
þ
Allocate local storage for globals in ZTS mode
þ
Call globals initialization and destruction as needed
PHP_MINIT_FUNCTION(yourext) {
ZEND_INIT_MODULE_GLOBALS(yourext,
yourext_globals_ctor, yourext_globals_dtor);
return SUCCESS;
}
PHP_MSHUTDOWN_FUNCTION(yourext) {
#ifndef ZTS
yourext_globals_dtor(&yourext_globals TSRMLS_CC);
#endif
return SUCCESS;
}
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PHP Extension Writing
75
Börger, Schlüter
RINIT/RSHUTDOWN
þ
Initialize request specific settings at RINIT
þ
Clean up their values at RSHUTDOWN
PHP_RINIT_FUNCTION(yourext) {
/* Track number of times this thread/process
* has serviced requests */
YOUREXT_G(counter)++;
return SUCCESS;
}
PHP_RSHUTDOWN_FUNCTION(yourext) {
if (YOUREXT_G(str)) {
efree(YOUREXT_G(str));
YOUREXT_G(str) = NULL;
}
return SUCCESS;
}
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PHP Extension Writing
76
Börger, Schlüter
Globals Access
þ
Access global values using YOUREXT_G(v) macro
PHP_FUNCTION(yourext_set_string) {
char *str;
int str_len;
if (zend_parse_parameters(ZEND_NUM_ARGS(), "s",
&str, &str_len) == FAILURE) {
return;
}
if (YOUREXT_G(str)) {
efree(YOUREXT_G(str));
}
YOUREXT_G(str) = estrndup(str, str_len);
YOUREXT_G(strlen) = str_len;
RETURN_TRUE;
}
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PHP Extension Writing
77
Börger, Schlüter
Globals Access
þ
Access global values using YOUREXT_G(v) macro
PHP_FUNCTION(yourext_get_string) {
if (YOUREXT_G(str)) {
RETURN_STRINGL(YOUREXT_G(str), YOUREXT_G(strlen), 1);
} else {
RETURN_EMPTY_STRING();
}
}
PHP Extension Writing
78
Börger, Schlüter
Registering consts
þ
Register constants during MINIT (usually)
þ name_len here is sizeof()
þ Thus name must be a real string
Do notuse string variables!
int zend_get_constant(char *name, uint name_len, 
zval *result TSRMLS_DC);
REGISTER_LONG_CONSTANT(name, lval, flags) 
REGISTER_DOUBLE_CONSTANT(name, dval, flags) 
REGISTER_STRING_CONSTANT(name, str, flags) 
REGISTER_STRINGL_CONSTANT(name, str, len, flags) 
int zend_register_constant(zend_constant *c TSRMLS_DC);
/* Case-sensitive */
#define CONST_CS
(1<<0)
/* Persistent */
#define CONST_PERSISTENT
(1<<1)
PHP Extension Writing
79
Börger, Schlüter
Registering consts
þ
Persistent constants require CONST_PERSISTENT
þ
Non-persistent string constants must be estrdup'd
PHP_MINIT_FUNCTION(yourext) {
REGISTER_LONG_CONSTANT("YOUREXT_CONSTNAME", 42
CONST_CS | CONST_PERSISTENT);
REGISTER_STRING_CONSTANT("YOUREXT_VERSION", "$ID: $", 
CONST_CS | CONST_PERSISTENT);
return SUCCESS;
}
PHP_RINIT_FUNCTION(yourext) {
REGISTER_LONG_CONSTANT("YOUREXT_COUNTER", 
YOUREXT_G(counter), CONST_CS);
return SUCCESS;
}
PHP Extension Writing
80
Börger, Schlüter
PHP_MINFO_FUNCTION(yourext)
{
php_info_print_table_start();
php_info_print_table_header(2, "YourExt","enabled");
php_info_print_table_row(2, 
"Version", "$ID: $");
php_info_print_table_row(2, 
"Somestring"YOUREXT_G(str));
php_info_print_table_end();
MINFO
þ
Provide some information about your extension
þ MINFO has no return value
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