PHP教程
详解PHP源码
本文主要是介绍详解PHP源码，对大家解决编程问题具有一定的参考价值，需要的程序猿们随着小编来一起学习吧！
in_array() php内置函数的源码解读
/* {{{ proto mixed array_search(mixed needle, array haystack [, bool strict])
Searches the array for a given value and returns the corresponding key if successful */
PHP_FUNCTION(array_search)
{
php_search_array(INTERNAL_FUNCTION_PARAM_PASSTHRU, 1);
}
PHP_FUNCTION(in_array)
{
php_search_array(INTERNAL_FUNCTION_PARAM_PASSTHRU, 0);
}
/* void php_search_array(INTERNAL_FUNCTION_PARAMETERS, int behavior)
* 0 = return boolean
* 1 = return key
*/
static inline void php_search_array(INTERNAL_FUNCTION_PARAMETERS, int behavior) /* {{{ */
{
zval *value, /* value to check for */
*array, /* array to check in */
*entry; /* pointer to array entry */
zend_ulong num_idx;
zend_string *str_idx;
zend_bool strict = 0; /* strict comparison or not */
ZEND_PARSE_PARAMETERS_START(2, 3) /* 开始接收参数 */
/*第一个参数表示必传的参数个数，第二个参数表示最多传入的参数个数。*/
Z_PARAM_ZVAL(value) /* 接收必填参数(这个参数可能是int也可能是str) 所以没有指定类型*/
Z_PARAM_ARRAY(array) /* 接收必填参数数组类型 */
Z_PARAM_OPTIONAL
Z_PARAM_BOOL(strict) /* 接收选填参数bool类型 */
ZEND_PARSE_PARAMETERS_END(); /* 结束 */
if (strict) {
ZEND_HASH_FOREACH_KEY_VAL_IND(Z_ARRVAL_P(array), num_idx, str_idx, entry) {
ZVAL_DEREF(entry);
if (fast_is_identical_function(value, entry)) {
if (behavior == 0) {
RETURN_TRUE;
} else {
if (str_idx) {
RETVAL_STR_COPY(str_idx);
} else {
RETVAL_LONG(num_idx);
}
return;
}
}
} ZEND_HASH_FOREACH_END();
} else { /* 理解下下边这块 _p 是指针，_pp 是指针的指针*/ /* */
if (Z_TYPE_P(value) == IS_LONG) { /* 按照value的值的类型来处理 IS_LONG 是长整型 */
ZEND_HASH_FOREACH_KEY_VAL_IND(Z_ARRVAL_P(array), num_idx, str_idx, entry) {/* ZEND_HASH_FOREACH_KEY_VAL_IND 函数意思是zend遍历 间接zval 类型数据 */
if (fast_equal_check_long(value, entry)) {
if (behavior == 0) { /* 这里是 in_array() */
RETURN_TRUE;
} else { /* 这里是 array_search() */
if (str_idx) {
RETVAL_STR_COPY(str_idx); /* 字符串类型的返回值 */
} else {
RETVAL_LONG(num_idx); /* 整型返回值 */
}
return;/* 为了提前结束函数 */
}
}
} ZEND_HASH_FOREACH_END();/* 遍历结束 */
} else if (Z_TYPE_P(value) == IS_STRING) {
ZEND_HASH_FOREACH_KEY_VAL_IND(Z_ARRVAL_P(array), num_idx, str_idx, entry) {
if (fast_equal_check_string(value, entry)) {
if (behavior == 0) {
RETURN_TRUE;
} else {
if (str_idx) {
RETVAL_STR_COPY(str_idx);
} else {
RETVAL_LONG(num_idx);
}
return;
}
}
} ZEND_HASH_FOREACH_END();
} else {
ZEND_HASH_FOREACH_KEY_VAL_IND(Z_ARRVAL_P(array), num_idx, str_idx, entry) {
if (fast_equal_check_function(value, entry)) {
if (behavior == 0) {
RETURN_TRUE;
} else {
if (str_idx) {
RETVAL_STR_COPY(str_idx);
} else {
RETVAL_LONG(num_idx);
}
return;
}
}
} ZEND_HASH_FOREACH_END();
}
}
RETURN_FALSE;
}
static zend_always_inline int fast_equal_check_long(zval *op1, zval *op2)
/* zend_always_inline 含义函数开始执行时，需要为函数分配相应的函数栈帧并入栈 */
{
zval result;
if (EXPECTED(Z_TYPE_P(op2) == IS_LONG)) { /* 都为整型的时候 */
return Z_LVAL_P(op1) == Z_LVAL_P(op2); /* 直接比较 相同true 不相同 false*/
}
compare_function(&result, op1, op2); /* 类型不一样的时候用这个函数 */
return Z_LVAL(result) == 0; /* 把result值读出来比较返回值 */
}
ZEND_API int ZEND_FASTCALL compare_function(zval *result, zval *op1, zval *op2)
{
int ret;
int converted = 0;
zval op1_copy, op2_copy;
zval *op_free, tmp_free;
while (1) {
switch (TYPE_PAIR(Z_TYPE_P(op1), Z_TYPE_P(op2))) {
case TYPE_PAIR(IS_LONG, IS_LONG):
ZVAL_LONG(result, Z_LVAL_P(op1)>Z_LVAL_P(op2)?1:(Z_LVAL_P(op1)<Z_LVAL_P(op2)?-1:0));
return SUCCESS;
case TYPE_PAIR(IS_DOUBLE, IS_LONG):
Z_DVAL_P(result) = Z_DVAL_P(op1) - (double)Z_LVAL_P(op2);
ZVAL_LONG(result, ZEND_NORMALIZE_BOOL(Z_DVAL_P(result)));
return SUCCESS;
case TYPE_PAIR(IS_LONG, IS_DOUBLE):
Z_DVAL_P(result) = (double)Z_LVAL_P(op1) - Z_DVAL_P(op2);
ZVAL_LONG(result, ZEND_NORMALIZE_BOOL(Z_DVAL_P(result)));
return SUCCESS;
case TYPE_PAIR(IS_DOUBLE, IS_DOUBLE):
if (Z_DVAL_P(op1) == Z_DVAL_P(op2)) {
ZVAL_LONG(result, 0);
} else {
Z_DVAL_P(result) = Z_DVAL_P(op1) - Z_DVAL_P(op2);
ZVAL_LONG(result, ZEND_NORMALIZE_BOOL(Z_DVAL_P(result)));
}
return SUCCESS;
case TYPE_PAIR(IS_ARRAY, IS_ARRAY):
ZVAL_LONG(result, zend_compare_arrays(op1, op2));
return SUCCESS;
case TYPE_PAIR(IS_NULL, IS_NULL):
case TYPE_PAIR(IS_NULL, IS_FALSE):
case TYPE_PAIR(IS_FALSE, IS_NULL):
case TYPE_PAIR(IS_FALSE, IS_FALSE):
case TYPE_PAIR(IS_TRUE, IS_TRUE):
ZVAL_LONG(result, 0);
return SUCCESS;
case TYPE_PAIR(IS_NULL, IS_TRUE):
ZVAL_LONG(result, -1);
return SUCCESS;
case TYPE_PAIR(IS_TRUE, IS_NULL):
ZVAL_LONG(result, 1);
return SUCCESS;
case TYPE_PAIR(IS_STRING, IS_STRING):
if (Z_STR_P(op1) == Z_STR_P(op2)) {
ZVAL_LONG(result, 0);
return SUCCESS;
}
ZVAL_LONG(result, zendi_smart_strcmp(Z_STR_P(op1), Z_STR_P(op2)));
return SUCCESS;
case TYPE_PAIR(IS_NULL, IS_STRING):
ZVAL_LONG(result, Z_STRLEN_P(op2) == 0 ? 0 : -1);
return SUCCESS;
case TYPE_PAIR(IS_STRING, IS_NULL):
ZVAL_LONG(result, Z_STRLEN_P(op1) == 0 ? 0 : 1);
return SUCCESS;
case TYPE_PAIR(IS_OBJECT, IS_NULL):
ZVAL_LONG(result, 1);
return SUCCESS;
case TYPE_PAIR(IS_NULL, IS_OBJECT):
ZVAL_LONG(result, -1);
return SUCCESS;
default:
if (Z_ISREF_P(op1)) {
op1 = Z_REFVAL_P(op1);
continue;
} else if (Z_ISREF_P(op2)) {
op2 = Z_REFVAL_P(op2);
continue;
}
if (Z_TYPE_P(op1) == IS_OBJECT && Z_OBJ_HANDLER_P(op1, compare)) {
ret = Z_OBJ_HANDLER_P(op1, compare)(result, op1, op2);
if (UNEXPECTED(Z_TYPE_P(result) != IS_LONG)) {
convert_compare_result_to_long(result);
}
return ret;
} else if (Z_TYPE_P(op2) == IS_OBJECT && Z_OBJ_HANDLER_P(op2, compare)) {
ret = Z_OBJ_HANDLER_P(op2, compare)(result, op1, op2);
if (UNEXPECTED(Z_TYPE_P(result) != IS_LONG)) {
convert_compare_result_to_long(result);
}
return ret;
}
if (Z_TYPE_P(op1) == IS_OBJECT && Z_TYPE_P(op2) == IS_OBJECT) {
if (Z_OBJ_P(op1) == Z_OBJ_P(op2)) {
/* object handles are identical, apparently this is the same object */
ZVAL_LONG(result, 0);
return SUCCESS;
}
if (Z_OBJ_HANDLER_P(op1, compare_objects) == Z_OBJ_HANDLER_P(op2, compare_objects)) {
ZVAL_LONG(result, Z_OBJ_HANDLER_P(op1, compare_objects)(op1, op2));
return SUCCESS;
}
}
if (Z_TYPE_P(op1) == IS_OBJECT) {
if (Z_OBJ_HT_P(op1)->get) {
zval rv;
op_free = Z_OBJ_HT_P(op1)->get(op1, &rv);
ret = compare_function(result, op_free, op2);
zend_free_obj_get_result(op_free);
return ret;
} else if (Z_TYPE_P(op2) != IS_OBJECT && Z_OBJ_HT_P(op1)->cast_object) {
ZVAL_UNDEF(&tmp_free);
if (Z_OBJ_HT_P(op1)->cast_object(op1, &tmp_free, ((Z_TYPE_P(op2) == IS_FALSE || Z_TYPE_P(op2) == IS_TRUE) ? _IS_BOOL : Z_TYPE_P(op2))) == FAILURE) {
ZVAL_LONG(result, 1);
zend_free_obj_get_result(&tmp_free);
return SUCCESS;
}
ret = compare_function(result, &tmp_free, op2);
zend_free_obj_get_result(&tmp_free);
return ret;
}
}
if (Z_TYPE_P(op2) == IS_OBJECT) {
if (Z_OBJ_HT_P(op2)->get) {
zval rv;
op_free = Z_OBJ_HT_P(op2)->get(op2, &rv);
ret = compare_function(result, op1, op_free);
zend_free_obj_get_result(op_free);
return ret;
} else if (Z_TYPE_P(op1) != IS_OBJECT && Z_OBJ_HT_P(op2)->cast_object) {
ZVAL_UNDEF(&tmp_free);
if (Z_OBJ_HT_P(op2)->cast_object(op2, &tmp_free, ((Z_TYPE_P(op1) == IS_FALSE || Z_TYPE_P(op1) == IS_TRUE) ? _IS_BOOL : Z_TYPE_P(op1))) == FAILURE) {
ZVAL_LONG(result, -1);
zend_free_obj_get_result(&tmp_free);
return SUCCESS;
}
ret = compare_function(result, op1, &tmp_free);
zend_free_obj_get_result(&tmp_free);
return ret;
} else if (Z_TYPE_P(op1) == IS_OBJECT) {
ZVAL_LONG(result, 1);
return SUCCESS;
}
}
if (!converted) {
if (Z_TYPE_P(op1) == IS_NULL || Z_TYPE_P(op1) == IS_FALSE) {
ZVAL_LONG(result, zval_is_true(op2) ? -1 : 0);
return SUCCESS;
} else if (Z_TYPE_P(op2) == IS_NULL || Z_TYPE_P(op2) == IS_FALSE) {
ZVAL_LONG(result, zval_is_true(op1) ? 1 : 0);
return SUCCESS;
} else if (Z_TYPE_P(op1) == IS_TRUE) {
ZVAL_LONG(result, zval_is_true(op2) ? 0 : 1);
return SUCCESS;
} else if (Z_TYPE_P(op2) == IS_TRUE) {
ZVAL_LONG(result, zval_is_true(op1) ? 0 : -1);
return SUCCESS;
} else {
op1 = zendi_convert_scalar_to_number(op1, &op1_copy, result, 1);
op2 = zendi_convert_scalar_to_number(op2, &op2_copy, result, 1);
if (EG(exception)) {
if (result != op1) {
ZVAL_UNDEF(result);
}
return FAILURE;
}
converted = 1;
}
} else if (Z_TYPE_P(op1)==IS_ARRAY) {
ZVAL_LONG(result, 1);
return SUCCESS;
} else if (Z_TYPE_P(op2)==IS_ARRAY) {
ZVAL_LONG(result, -1);
return SUCCESS;
} else if (Z_TYPE_P(op1)==IS_OBJECT) {
ZVAL_LONG(result, 1);
return SUCCESS;
} else if (Z_TYPE_P(op2)==IS_OBJECT) {
ZVAL_LONG(result, -1);
return SUCCESS;
} else {
ZVAL_LONG(result, 0);
return FAILURE;
}
}
}
}
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