static void php_str_replace_in_subject(zval *search, zval *replace, zval **subject, zval *result, int case_sensitivity, int *replace_count)
{
zval **search_entry,
**replace_entry = NULL,
temp_result;
char *replace_value = NULL;
int replace_len = 0;
/* Make sure we're dealing with strings. */
convert_to_string_ex(subject);
Z_TYPE_P(result) = IS_STRING;
如果原字符串为空哪么返回空
if (Z_STRLEN_PP(subject) == 0) {
ZVAL_STRINGL(result, "", 0, 1);
return;
}
如果要查找的是数组
/* If search is an array */
if (Z_TYPE_P(search) == IS_ARRAY) {
/* Duplicate subject string for repeated replacement */
*result = **subject;
拷贝**subject值（其中可以含有hash）
zval_copy_ctor(result);
清楚引用标识以及引用计数
INIT_PZVAL(result);
将指针指向数组第一个元素
zend_hash_internal_pointer_reset(Z_ARRVAL_P(search));
如果替换后的值为数组，将指针指向第一个元素，否则直接取值
if (Z_TYPE_P(replace) == IS_ARRAY) {
zend_hash_internal_pointer_reset(Z_ARRVAL_P(replace));
} else {
/* Set replacement value to the passed one */
replace_value = Z_STRVAL_P(replace);
replace_len = Z_STRLEN_P(replace);
}
循环要查找的字符串并且将值放进数组search_entry
zend_hash_get_current_data得到当前指针所指单元的值
/* For each entry in the search array, get the entry */
while (zend_hash_get_current_data(Z_ARRVAL_P(search), (void **) &search_entry) == SUCCESS) {
/* Make sure we're dealing with strings. */
其实相当于获得search_entry的拷贝，该拷贝可以自由操作销毁不会影响其他变量
SEPARATE_ZVAL(search_entry);
convert_to_string(*search_entry);
如果当前要查找的字符串为空，那么指针跳到下一个元素
if (Z_STRLEN_PP(search_entry) == 0) {
zend_hash_move_forward(Z_ARRVAL_P(search));
如果替换值为数组同样跳到下一个因为 当前要查找的为空了要替换的也就没有作用了，并且跳过本次对
查找字符串组的循环继续进行进行下一个值
if (Z_TYPE_P(replace) == IS_ARRAY) {
zend_hash_move_forward(Z_ARRVAL_P(replace));
}
continue;
}
如果要替换的字符串为数组，并且当前所查找字符串循环位置的值不为空
/* If replace is an array. */
if (Z_TYPE_P(replace) == IS_ARRAY) {
/* Get current entry */
如果当前可以取到值则娶当前指针的值和长度否则替换为空，注意这里没有循环哦不同于while
if (zend_hash_get_current_data(Z_ARRVAL_P(replace), (void **)&replace_entry) == SUCCESS) {
/* Make sure we're dealing with strings. */
convert_to_string_ex(replace_entry);
/* Set replacement value to the one we got from array */
replace_value = Z_STRVAL_PP(replace_entry);
replace_len = Z_STRLEN_PP(replace_entry);
zend_hash_move_forward(Z_ARRVAL_P(replace));
} else {
/* We've run out of replacement strings, so use an empty one. */
replace_value = "";
replace_len = 0;
}
}
下边的大概就是替换函数了，google坏了上不去百度雅虎没结果需要等等知道结果了
一个字符与字符串的情况
if (Z_STRLEN_PP(search_entry) == 1) {
php_char_to_str_ex(Z_STRVAL_P(result),
Z_STRLEN_P(result),
Z_STRVAL_PP(search_entry)[0],
replace_value,
replace_len,
&temp_result,
case_sensitivity,
replace_count);
} else if (Z_STRLEN_PP(search_entry) > 1) {
Z_STRVAL(temp_result) = php_str_to_str_ex(Z_STRVAL_P(result), Z_STRLEN_P(result),
Z_STRVAL_PP(search_entry), Z_STRLEN_PP(search_entry),
replace_value, replace_len, &Z_STRLEN(temp_result), case_sensitivity, replace_count);
}
释放前面result内存
efree(Z_STRVAL_P(result));
Z_STRVAL_P(result) = Z_STRVAL(temp_result);
Z_STRLEN_P(result) = Z_STRLEN(temp_result);
是否表示没有执行成功？直接返回了？
if (Z_STRLEN_P(result) == 0) {
return;
}
zend_hash_move_forward(Z_ARRVAL_P(search));
}
} else {
如果超找的只是一个字符不是字串
if (Z_STRLEN_P(search) == 1) {
php_char_to_str_ex(Z_STRVAL_PP(subject),
Z_STRLEN_PP(subject),
Z_STRVAL_P(search)[0],
Z_STRVAL_P(replace),
Z_STRLEN_P(replace),
result,
case_sensitivity,
replace_count);
} else if (Z_STRLEN_P(search) > 1) {
Z_STRVAL_P(result) = php_str_to_str_ex(Z_STRVAL_PP(subject), Z_STRLEN_PP(subject),
Z_STRVAL_P(search), Z_STRLEN_P(search),
Z_STRVAL_P(replace), Z_STRLEN_P(replace), &Z_STRLEN_P(result), case_sensitivity, replace_count);
} else {
*result = **subject;
zval_copy_ctor(result);
INIT_PZVAL(result);
}
}
}
