1、a.php
<?php
$y="12";
$x = array();
for($j=0;$j<50000;$j++){
$x[]= "{$j}";
}
for($i=0;$i<30000;$i++){
if(in_array($y,$x,true)){
continue;
}
}
?>
測試
[root@dev tmp]# time php a.php real 0m0.101s user 0m0.080s sys 0m0.013s
2、b.php
<?php
$y="1800";
$x = array();
for($j=0;$j<50000;$j++){
$x[]= "{$j}";
}
for($i=0;$i<30000;$i++){
if(in_array($y,$x)){
continue;
}
}
測試
[root@dev tmp]# time php b.php real 0m9.517s user 0m4.486s sys 0m0.015s
需要9s
對於b.php 有嚴重的效率問題，跟蹤測試一下好了
[root@dev tmp]# ltrace -c php b.php % time seconds usecs/call calls function ------ ----------- ----------- --------- -------------------- 52.92 175.486683 224 780155 strtol 33.34 110.550182 55275091 2 __libc_start_main 6.33 20.999979 177 118479 memcpy 3.56 11.819558 234 50394 __ctype_b_loc 1.66 5.510564 285 19294 free 1.42 4.704605 156820 30 dlopen 0.43 1.416750 76 18430 malloc 0.13 0.422050 76 5510 strlen 0.08 0.258620 76 3375 __ctype_tolower_loc 0.04 0.137245 77 1770 strrchr 0.02 0.067158 76 880 strcasecmp 0.02 0.059222 76 776 calloc 0.01 0.034591 17295 2 getprotobyname 0.01 0.031099 76 407 realloc 0.01 0.021277 77 276 memset 0.00 0.011502 383 30 dlclose 0.00 0.010671 85 125 0.00 0.006806 73 93 fileno 0.00 0.006095 76 80 strncasecmp 0.00 0.005397 77 70 strchr 0.00 0.005139 160 32 ftell 0.00 0.004405 137 32 fclose 0.00 0.003644 104 35 __fxstat 0.00 0.003432 107 32 fopen 0.00 0.003103 107 29 munmap 0.00 0.003062 78 39 getenv 0.00 0.003031 104 29 mmap 0.00 0.003027 104 29 isatty 0.00 0.002825 104 27 __xstat 0.00 0.002468 82 30 dlsym 0.00 0.002167 74 29 sysconf 0.00 0.001956 75 26 _setjmp 0.00 0.001419 109 13 __lxstat 0.00 0.001294 76 17 memchr 0.00 0.001125 1125 1 SYS_clone 0.00 0.001099 1099 1 tzset 0.00 0.001098 1098 1 exit 0.00 0.001075 1075 1 ERR_load_crypto_strings 0.00 0.000986 986 1 using_history 0.00 0.000837 837 1 SYS_exit_group 0.00 0.000606 75 8 __strdup 0.00 0.000596 74 8 strcmp 0.00 0.000591 73 8 __memcpy_chk 0.00 0.000457 76 6 fflush 0.00 0.000326 108 3 getcwd 0.00 0.000309 77 4 __errno_location 0.00 0.000271 271 1 setlocale 0.00 0.000271 271 1 scandir 0.00 0.000238 79 3 __sprintf_chk 0.00 0.000222 111 2 signal 0.00 0.000206 206 1 SSL_library_init 0.00 0.000186 186 1 fgetc 0.00 0.000155 155 1 ERR_load_ERR_strings 0.00 0.000154 77 2 xmlSetGenericErrorFunc 0.00 0.000151 75 2 __strtok_r 0.00 0.000151 75 2 xmlParserInputBufferCreateFilenameDefault 0.00 0.000148 148 1 xmlInitParser 0.00 0.000147 73 2 xmlOutputBufferCreateFilenameDefault 0.00 0.000130 130 1 OpenSSL_add_all_ciphers 0.00 0.000122 122 1 EVP_cleanup 0.00 0.000112 112 1 access 0.00 0.000109 109 1 rewind 0.00 0.000106 106 1 OPENSSL_add_all_algorithms_noconf 0.00 0.000105 105 1 sigprocmask 0.00 0.000093 93 1 gnu_get_libc_version 0.00 0.000090 90 1 OpenSSL_add_all_digests 0.00 0.000084 84 1 xmlCleanupParser 0.00 0.000081 81 1 xmlRelaxNGCleanupTypes 0.00 0.000079 79 1 xmlSetStructuredErrorFunc 0.00 0.000078 78 1 SSL_get_ex_new_index 0.00 0.000077 77 1 __gmp_set_memory_functions 0.00 0.000076 76 1 ERR_load_EVP_strings 0.00 0.000076 76 1 pcre_version 0.00 0.000075 75 1 X509_get_default_cert_area 0.00 0.000075 75 1 strstr 0.00 0.000074 74 1 sigemptyset 0.00 0.000074 74 1 __xmlParserVersion 0.00 0.000074 74 1 time 0.00 0.000074 74 1 xmlResetLastError 0.00 0.000074 74 1 strncmp 0.00 0.000073 73 1 sigaddset ------ ----------- ----------- --------- -------------------- 100.00 331.614442 1000662 total
我們發現 strtol 占用了大量的時間
查一下庫函數
/*
函數名: strtol
功 能: 將串轉換為長整數
用 法: long strtol(char *str, char **endptr, int base);
程序例:
*/
#include <stdlib.h>
#include <stdio.h>
int main(void)
{
char *string = "87654321", *endptr;
long lnumber;
/* strtol converts string to long integer */
lnumber = strtol(string, &endptr, 10);
printf("string = %s long = %ld\n", string, lnumber);
return 0;
}
所以應該是源代碼中有大量的類型轉換
in_array是這個樣子的
bool in_array ( mixed $needle , array $haystack [, bool $strict = FALSE ] )
在 haystack 中搜索 needle，如果沒有設置 strict 則使用寬松的比較。
needle
待搜索的值。如果 needle 是字符串，則比較是區分大小寫的。
haystack
這個數組。
strict
如果第三個參數 strict 的值為 TRUE 則 in_array() 函數還會檢查 needle 的類型是否和 haystack 中的相同。
第一步 在ext/standard/array.c 文件中
/* }}} */
/* {{{ proto bool in_array(mixed needle, array haystack [, bool strict])
Checks if the given value exists in the array */
PHP_FUNCTION(in_array)
{
php_search_array(INTERNAL_FUNCTION_PARAM_PASSTHRU, 0);
}
/* }}} */
/* {{{ 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);
}
/* }}} */
順便看到了array_search，原來和in_array的內部實現基本一致
其中函數的參數 在./zend.h中
#define INTERNAL_FUNCTION_PARAM_PASSTHRU ht, return_value, return_value_ptr, this_ptr, return_value_used TSRMLS_CC
第二步 在ext/standard/array.c 文件中 查看php_search_array原型
/* void php_search_array(INTERNAL_FUNCTION_PARAMETERS, int behavior)
* 0 = return boolean
* 1 = return key
*/
static 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 */
res; /* comparison result */
HashPosition pos; /* hash iterator */
zend_bool strict = 0; /* strict comparison or not */
ulong num_key;
uint str_key_len;
char *string_key;
int (*is_equal_func)(zval *, zval *, zval * TSRMLS_DC) = is_equal_function;
if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "za|b", &value, &array, &strict) == FAILURE) {
return;
}
if (strict) {
is_equal_func = is_identical_function;
}
zend_hash_internal_pointer_reset_ex(Z_ARRVAL_P(array), &pos);
while (zend_hash_get_current_data_ex(Z_ARRVAL_P(array), (void **)&entry, &pos) == SUCCESS) {
is_equal_func(&res, value, *entry TSRMLS_CC);
if (Z_LVAL(res)) {
if (behavior == 0) {
RETURN_TRUE;
} else {
/* Return current key */
switch (zend_hash_get_current_key_ex(Z_ARRVAL_P(array), &string_key, &str_key_len, &num_key, 0, &pos)) {
case HASH_KEY_IS_STRING:
RETURN_STRINGL(string_key, str_key_len - 1, 1);
break;
case HASH_KEY_IS_LONG:
RETURN_LONG(num_key);
break;
}
}
}
zend_hash_move_forward_ex(Z_ARRVAL_P(array), &pos);
}
RETURN_FALSE;
}
/* }}} */
/* {{{ proto bool in_array(mixed needle, array haystack [, bool strict])
Checks if the given value exists in the array */
我們發現 strict 這個值的不同有兩種比較方式，看一下兩個函數的不同之處
is_identical_function 檢查類型是否相同
ZEND_API int is_identical_function(zval *result, zval *op1, zval *op2 TSRMLS_DC) /* {{{ */
{
Z_TYPE_P(result) = IS_BOOL;
if (Z_TYPE_P(op1) != Z_TYPE_P(op2)) {
Z_LVAL_P(result) = 0;
return SUCCESS;
}
switch (Z_TYPE_P(op1)) {
case IS_NULL:
Z_LVAL_P(result) = 1;
break;
case IS_BOOL:
case IS_LONG:
case IS_RESOURCE:
Z_LVAL_P(result) = (Z_LVAL_P(op1) == Z_LVAL_P(op2));
break;
case IS_DOUBLE:
Z_LVAL_P(result) = (Z_DVAL_P(op1) == Z_DVAL_P(op2));
break;
case IS_STRING:
Z_LVAL_P(result) = ((Z_STRLEN_P(op1) == Z_STRLEN_P(op2))
&& (!memcmp(Z_STRVAL_P(op1), Z_STRVAL_P(op2), Z_STRLEN_P(op1))));
break;
case IS_ARRAY:
Z_LVAL_P(result) = (Z_ARRVAL_P(op1) == Z_ARRVAL_P(op2)
zend_hash_compare(Z_ARRVAL_P(op1), Z_ARRVAL_P(op2), (compare_func_t) hash_zval_identical_function, 1 TSRMLS_CC)==0);
break;
case IS_OBJECT:
if (Z_OBJ_HT_P(op1) == Z_OBJ_HT_P(op2)) {
Z_LVAL_P(result) = (Z_OBJ_HANDLE_P(op1) == Z_OBJ_HANDLE_P(op2));
} else {
Z_LVAL_P(result) = 0;
}
break;
default:
Z_LVAL_P(result) = 0;
return FAILURE;
}
return SUCCESS;
}
/* }}} */
is_equal_function 不檢查類型是否相同，所以需要隱式轉換
ZEND_API int is_equal_function(zval *result, zval *op1, zval *op2 TSRMLS_DC) /* {{{ */
{
if (compare_function(result, op1, op2 TSRMLS_CC) == FAILURE) {
return FAILURE;
}
ZVAL_BOOL(result, (Z_LVAL_P(result) == 0));
return SUCCESS;
}
/* }}} */
==》compare_function
ZEND_API int compare_function(zval *result, zval *op1, zval *op2 TSRMLS_DC) /* {{{ */
{
int ret;
int converted = 0;
zval op1_copy, op2_copy;
zval *op_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):
zend_compare_arrays(result, op1, op2 TSRMLS_CC);
return SUCCESS;
case TYPE_PAIR(IS_NULL, IS_NULL):
ZVAL_LONG(result, 0);
return SUCCESS;
case TYPE_PAIR(IS_NULL, IS_BOOL):
ZVAL_LONG(result, Z_LVAL_P(op2) ? -1 : 0);
return SUCCESS;
case TYPE_PAIR(IS_BOOL, IS_NULL):
ZVAL_LONG(result, Z_LVAL_P(op1) ? 1 : 0);
return SUCCESS;
case TYPE_PAIR(IS_BOOL, IS_BOOL):
ZVAL_LONG(result, ZEND_NORMALIZE_BOOL(Z_LVAL_P(op1) - Z_LVAL_P(op2)));
return SUCCESS;
case TYPE_PAIR(IS_STRING, IS_STRING):
zendi_smart_strcmp(result, op1, op2);
return SUCCESS;
case TYPE_PAIR(IS_NULL, IS_STRING):
ZVAL_LONG(result, zend_binary_strcmp("", 0, Z_STRVAL_P(op2), Z_STRLEN_P(op2)));
return SUCCESS;
case TYPE_PAIR(IS_STRING, IS_NULL):
ZVAL_LONG(result, zend_binary_strcmp(Z_STRVAL_P(op1), Z_STRLEN_P(op1), "", 0));
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;
case TYPE_PAIR(IS_OBJECT, IS_OBJECT):
/* If both are objects sharing the same comparision handler then use is */
if (Z_OBJ_HANDLER_P(op1,compare_objects) == Z_OBJ_HANDLER_P(op2,compare_objects)) {
if (Z_OBJ_HANDLE_P(op1) == Z_OBJ_HANDLE_P(op2)) {
/* object handles are identical, apparently this is the same object */
ZVAL_LONG(result, 0);
return SUCCESS;
}
ZVAL_LONG(result, Z_OBJ_HT_P(op1)->compare_objects(op1, op2 TSRMLS_CC));
return SUCCESS;
}
/* break missing intentionally */
default:
if (Z_TYPE_P(op1) == IS_OBJECT) {
if (Z_OBJ_HT_P(op1)->get) {
op_free = Z_OBJ_HT_P(op1)->get(op1 TSRMLS_CC);
ret = compare_function(result, op_free, op2 TSRMLS_CC);
zend_free_obj_get_result(op_free TSRMLS_CC);
return ret;
} else if (Z_TYPE_P(op2) != IS_OBJECT && Z_OBJ_HT_P(op1)->cast_object) {
ALLOC_INIT_ZVAL(op_free);
if (Z_OBJ_HT_P(op1)->cast_object(op1, op_free, Z_TYPE_P(op2) TSRMLS_CC) == FAILURE) {
ZVAL_LONG(result, 1);
zend_free_obj_get_result(op_free TSRMLS_CC);
return SUCCESS;
}
ret = compare_function(result, op_free, op2 TSRMLS_CC);
zend_free_obj_get_result(op_free TSRMLS_CC);
return ret;
}
}
if (Z_TYPE_P(op2) == IS_OBJECT) {
if (Z_OBJ_HT_P(op2)->get) {
op_free = Z_OBJ_HT_P(op2)->get(op2 TSRMLS_CC);
ret = compare_function(result, op1, op_free TSRMLS_CC);
zend_free_obj_get_result(op_free TSRMLS_CC);
return ret;
} else if (Z_TYPE_P(op1) != IS_OBJECT && Z_OBJ_HT_P(op2)->cast_object) {
ALLOC_INIT_ZVAL(op_free);
if (Z_OBJ_HT_P(op2)->cast_object(op2, op_free, Z_TYPE_P(op1) TSRMLS_CC) == FAILURE) {
ZVAL_LONG(result, -1);
zend_free_obj_get_result(op_free TSRMLS_CC);
return SUCCESS;
}
ret = compare_function(result, op1, op_free TSRMLS_CC);
zend_free_obj_get_result(op_free TSRMLS_CC);
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) {
zendi_convert_to_boolean(op2, op2_copy, result);
ZVAL_LONG(result, Z_LVAL_P(op2) ? -1 : 0);
return SUCCESS;
} else if (Z_TYPE_P(op2) == IS_NULL) {
zendi_convert_to_boolean(op1, op1_copy, result);
ZVAL_LONG(result, Z_LVAL_P(op1) ? 1 : 0);
return SUCCESS;
} else if (Z_TYPE_P(op1) == IS_BOOL) {
zendi_convert_to_boolean(op2, op2_copy, result);
ZVAL_LONG(result, ZEND_NORMALIZE_BOOL(Z_LVAL_P(op1) - Z_LVAL_P(op2)));
return SUCCESS;
} else if (Z_TYPE_P(op2) == IS_BOOL) {
zendi_convert_to_boolean(op1, op1_copy, result);
ZVAL_LONG(result, ZEND_NORMALIZE_BOOL(Z_LVAL_P(op1) - Z_LVAL_P(op2)));
return SUCCESS;
} else {
zendi_convert_scalar_to_number(op1, op1_copy, result);
zendi_convert_scalar_to_number(op2, op2_copy, result);
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;
}
}
}
}
/* }}} */
接著看一下array 和string 怎麼比較的
==》zend_hash_compare 在Zend/zend_hash.c中
ZEND_API int zend_hash_compare(HashTable *ht1, HashTable *ht2, compare_func_t compar, zend_bool ordered TSRMLS_DC)
{
Bucket *p1, *p2 = NULL;
int result;
void *pData2;
IS_CONSISTENT(ht1);
IS_CONSISTENT(ht2);
HASH_PROTECT_RECURSION(ht1);.
HASH_PROTECT_RECURSION(ht2);.
result = ht1->nNumOfElements - ht2->nNumOfElements;
if (result!=0) {
HASH_UNPROTECT_RECURSION(ht1);.
HASH_UNPROTECT_RECURSION(ht2);.
return result;
}
p1 = ht1->pListHead;
if (ordered) {
p2 = ht2->pListHead;
}
while (p1) {
if (ordered && !p2) {
HASH_UNPROTECT_RECURSION(ht1);.
HASH_UNPROTECT_RECURSION(ht2);.
return 1; /* That's not supposed to happen */
}
if (ordered) {
if (p1->nKeyLength==0 && p2->nKeyLength==0) { /* numeric indices */
result = p1->h - p2->h;
if (result!=0) {
HASH_UNPROTECT_RECURSION(ht1);.
HASH_UNPROTECT_RECURSION(ht2);.
return result;
}
} else { /* string indices */
result = p1->nKeyLength - p2->nKeyLength;
if (result!=0) {
HASH_UNPROTECT_RECURSION(ht1);.
HASH_UNPROTECT_RECURSION(ht2);.
return result;
}
result = memcmp(p1->arKey, p2->arKey, p1->nKeyLength);
if (result!=0) {
HASH_UNPROTECT_RECURSION(ht1);.
HASH_UNPROTECT_RECURSION(ht2);.
return result;
}
}
pData2 = p2->pData;
} else {
if (p1->nKeyLength==0) { /* numeric index */
if (zend_hash_index_find(ht2, p1->h, &pData2)==FAILURE) {
HASH_UNPROTECT_RECURSION(ht1);.
HASH_UNPROTECT_RECURSION(ht2);.
return 1;
}
} else { /* string index */
if (zend_hash_quick_find(ht2, p1->arKey, p1->nKeyLength, p1->h, &pData2)==FAILURE) {
HASH_UNPROTECT_RECURSION(ht1);.
HASH_UNPROTECT_RECURSION(ht2);.
return 1;
}
}
}
result = compar(p1->pData, pData2 TSRMLS_CC);
if (result!=0) {
HASH_UNPROTECT_RECURSION(ht1);.
HASH_UNPROTECT_RECURSION(ht2);.
return result;
}
p1 = p1->pListNext;
if (ordered) {
p2 = p2->pListNext;
}
}
HASH_UNPROTECT_RECURSION(ht1);.
HASH_UNPROTECT_RECURSION(ht2);.
return 0;
}
==》還有一個 zendi_smart_strcmp 在Zend/zend_operators.c中
ZEND_API void zendi_smart_strcmp(zval *result, zval *s1, zval *s2) /* {{{ */
{
int ret1, ret2;
int oflow1, oflow2;
long lval1, lval2;
double dval1, dval2;
if ((ret1=is_numeric_string_ex(Z_STRVAL_P(s1), Z_STRLEN_P(s1), &lval1, &dval1, 0, &oflow1)) &&
(ret2=is_numeric_string_ex(Z_STRVAL_P(s2), Z_STRLEN_P(s2), &lval2, &dval2, 0, &oflow2))) {
#if ULONG_MAX == 0xFFFFFFFF
if (oflow1 != 0 && oflow1 == oflow2 && dval1 - dval2 == 0. &&
((oflow1 == 1 && dval1 > 9007199254740991. /*0x1FFFFFFFFFFFFF*/)
(oflow1 == -1 && dval1 < -9007199254740991.))) {
#else
if (oflow1 != 0 && oflow1 == oflow2 && dval1 - dval2 == 0.) {
#endif
/* both values are integers overflown to the same side, and the
* double comparison may have resulted in crucial accuracy lost */
goto string_cmp;
}
if ((ret1==IS_DOUBLE) (ret2==IS_DOUBLE)) {
if (ret1!=IS_DOUBLE) {
if (oflow2) {
/* 2nd operand is integer > LONG_MAX (oflow2==1) or < LONG_MIN (-1) */
ZVAL_LONG(result, -1 * oflow2);
return;
}
dval1 = (double) lval1;
} else if (ret2!=IS_DOUBLE) {
if (oflow1) {
ZVAL_LONG(result, oflow1);
return;
}
dval2 = (double) lval2;
} else if (dval1 == dval2 && !zend_finite(dval1)) {
/* Both values overflowed and have the same sign,
* so a numeric comparison would be inaccurate */
goto string_cmp;
}
Z_DVAL_P(result) = dval1 - dval2;
ZVAL_LONG(result, ZEND_NORMALIZE_BOOL(Z_DVAL_P(result)));
} else { /* they both have to be long's */
ZVAL_LONG(result, lval1 > lval2 ? 1 : (lval1 < lval2 ? -1 : 0));
}
} else {
string_cmp:
Z_LVAL_P(result) = zend_binary_zval_strcmp(s1, s2);
ZVAL_LONG(result, ZEND_NORMALIZE_BOOL(Z_LVAL_P(result)));
}
}
/* }}} *
我們這個類型轉換函數 is_numeric_string_ex 在 Zend/zend_operators.h
繼續跟蹤
==》is_numeric_string_ex
static inline zend_uchar is_numeric_string_ex(const char *str, int length, long *lval, double *dval, int allow_errors, int *oflow_info)
{
const char *ptr;
int base = 10, digits = 0, dp_or_e = 0;
double local_dval;
zend_uchar type;
if (!length) {
return 0;
}
if (oflow_info != NULL) {
*oflow_info = 0;
}
/* Skip any whitespace
* This is much faster than the isspace() function */
while (*str == ' ' *str == '\t' *str == '\n' *str == '\r' *str == '\v' *str == '\f') {
str++;
length--;
}
ptr = str;
if (*ptr == '-' *ptr == '+') {
ptr++;
}
if (ZEND_IS_DIGIT(*ptr)) {
/* Handle hex numbers
* str is used instead of ptr to disallow signs and keep old behavior */
if (length > 2 && *str == '0' && (str[1] == 'x' str[1] == 'X')) {
base = 16;
ptr += 2;
}
/* Skip any leading 0s */
while (*ptr == '0') {
ptr++;
}
/* Count the number of digits. If a decimal point/exponent is found,
* it's a double. Otherwise, if there's a dval or no need to check for
* a full match, stop when there are too many digits for a long */
for (type = IS_LONG; !(digits >= MAX_LENGTH_OF_LONG && (dval allow_errors == 1)); digits++, ptr++) {
check_digits:
if (ZEND_IS_DIGIT(*ptr) (base == 16 && ZEND_IS_XDIGIT(*ptr))) {
continue;
} else if (base == 10) {
if (*ptr == '.' && dp_or_e < 1) {
goto process_double;
} else if ((*ptr == 'e' *ptr == 'E') && dp_or_e < 2) {
const char *e = ptr + 1;
if (*e == '-' *e == '+') {
ptr = e++;
}
if (ZEND_IS_DIGIT(*e)) {
goto process_double;
}
}
}
break;
}
if (base == 10) {
if (digits >= MAX_LENGTH_OF_LONG) {
if (oflow_info != NULL) {
*oflow_info = *str == '-' ? -1 : 1;
}
dp_or_e = -1;
goto process_double;
}
} else if (!(digits < SIZEOF_LONG * 2 (digits == SIZEOF_LONG * 2 && ptr[-digits] <= '7'))) {
if (dval) {
local_dval = zend_hex_strtod(str, &ptr);
}
if (oflow_info != NULL) {
*oflow_info = 1;
}
type = IS_DOUBLE;
}
} else if (*ptr == '.' && ZEND_IS_DIGIT(ptr[1])) {
process_double:
type = IS_DOUBLE;
/* If there's a dval, do the conversion; else continue checking
* the digits if we need to check for a full match */
if (dval) {
local_dval = zend_strtod(str, &ptr);
} else if (allow_errors != 1 && dp_or_e != -1) {
dp_or_e = (*ptr++ == '.') ? 1 : 2;
goto check_digits;
}
} else {
return 0;
}
if (ptr != str + length) {
if (!allow_errors) {
return 0;
}
if (allow_errors == -1) {
zend_error(E_NOTICE, "A non well formed numeric value encountered");
}
}
if (type == IS_LONG) {
if (digits == MAX_LENGTH_OF_LONG - 1) {
int cmp = strcmp(&ptr[-digits], long_min_digits);
if (!(cmp < 0 (cmp == 0 && *str == '-'))) {
if (dval) {
*dval = zend_strtod(str, NULL);
}
if (oflow_info != NULL) {
*oflow_info = *str == '-' ? -1 : 1;
}
return IS_DOUBLE;
}
}
if (lval) {
*lval = strtol(str, NULL, base);
}
return IS_LONG;
} else {
if (dval) {
*dval = local_dval;
}
return IS_DOUBLE;
}
}
type == IS_LONG時果然有這個代碼
截取這一段代碼
……
if (type == IS_LONG) {
if (digits == MAX_LENGTH_OF_LONG - 1) {
int cmp = strcmp(&ptr[-digits], long_min_digits);
if (!(cmp < 0 (cmp == 0 && *str == '-'))) {
if (dval) {
*dval = zend_strtod(str, NULL);
}
if (oflow_info != NULL) {
*oflow_info = *str == '-' ? -1 : 1;
}
return IS_DOUBLE;
}
}
if (lval) {
*lval = strtol(str, NULL, base);
}
return IS_LONG;
}
……
原來如此 strtol 在這裡的
