php擴充開發-常量

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//常量在核心中的結構typedef struct _zend_constant {    zval value;    int flags;    char *name;    uint name_len;    int module_number;} zend_constant;

//常量註冊的宏定義
#define REGISTER_NULL_CONSTANT(name, flags)  zend_register_null_constant((name), sizeof(name), (flags), module_number TSRMLS_CC)#define REGISTER_BOOL_CONSTANT(name, bval, flags)  zend_register_bool_constant((name), sizeof(name), (bval), (flags), module_number TSRMLS_CC)#define REGISTER_LONG_CONSTANT(name, lval, flags)  zend_register_long_constant((name), sizeof(name), (lval), (flags), module_number TSRMLS_CC)#define REGISTER_DOUBLE_CONSTANT(name, dval, flags)  zend_register_double_constant((name), sizeof(name), (dval), (flags), module_number TSRMLS_CC)#define REGISTER_STRING_CONSTANT(name, str, flags)  zend_register_string_constant((name), sizeof(name), (str), (flags), module_number TSRMLS_CC)#define REGISTER_STRINGL_CONSTANT(name, str, len, flags)  zend_register_stringl_constant((name), sizeof(name), (str), (len), (flags), module_number TSRMLS_CC)

//在MINIT函數中定義常量
//參數說明：
//1，常量名稱，此處只能是字串，不能是變數
//2，常量的值
//3，常量的屬性，對應結構體zend_constant的int flags。CONST_CS表示區分大小寫，CONST_PERSISTENT表示在php運行過程中，長期存在

PHP_MINIT_FUNCTION(myext){ 　 REGISTER_STRING_CONSTANT("MYEXT_VERSION",PHP_MYEXT_VERSION,CONST_CS|CONST_PERSISTENT);    REGISTER_LONG_CONSTANT("MYEXT_LONG_ZERO",0,CONST_CS|CONST_PERSISTENT);    return SUCCESS;}
/*

var_dump(MYEXT_VERSION);
var_dump(MYEXT_LONG_ZERO);

 

string(3) "1.0"

int(0)

*/

 

php擴充開發-常量