PHP常量的实现

[php]代码库

/* {{{ proto bool define(string constant_name, mixed value, boolean case_insensitive=false)
   Define a new constant */
ZEND_FUNCTION(define)
{
        if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "sz|b", &name,
                &name_len, &val, &non_cs) == FAILURE) {
                return;
        }
 
        ... // 类常量定义 此处不做介绍
 
        ... // 值类型判断和处理
 
        c.value = *val;
        zval_copy_ctor(&c.value);
        if (val_free) {
                zval_ptr_dtor(&val_free);
        }
        c.flags = case_sensitive; /* non persistent */
        c.name = zend_strndup(name, name_len);
        c.name_len = name_len+1;
        c.module_number = PHP_USER_CONSTANT;
        if (zend_register_constant(&c TSRMLS_CC) == SUCCESS) {
                RETURN_TRUE;
        } else {
                RETURN_FALSE;
        }
}
/* }}} */