PHP built-in function Analysis Array_column ()

1 php_function (array_column)2 {3Zval *zcolumn = null, *zkey = NULL, *data;4HashTable *Arr_hash;5Zval *zcolval = NULL, *zkeyval =NULL, RVC, RVK;6 7     //If you receive a null variable in a PHP language, it will be converted directly to NULL in the C language, rather than encapsulated as a is_null type Zval8     if(Zend_parse_parameters (Zend_num_args (),"hz!| z!", &arr_hash, &zcolumn, &zkey) = =FAILURE) {9         return;Ten     } One  A     /*checks whether COLUNM and index are valid (numbers and objects only, and objects need to be converted to strings).  - * Invalid quote the%s key should is either a string or an integer warning error.  -     */ the     if(Zcolumn &&!array_column_param_helper (Zcolumn,"column")) || -(Zkey &&!array_column_param_helper (Zkey,"Index"))) { - Return_false; -     } +     //Initialize return value - Array_init (return_value); +     //Iterating through an array A Zend_hash_foreach_val (Arr_hash, data) { at zval_deref (data); -  -         if(!zcolumn) {//Column Not set -Zcolval =data; -}Else if((Zcolval = Array_column_fetch_prop (data, zcolumn, &rvc) = = NULL) {//The value of the column is null, skip, and go to the next loop -             Continue; in         } -  to         /*Failure would leave zkeyval alone which would land us on the final else block below + * Which is to append the value as Next_index -          */ the         if(zkey) { *Zkeyval = Array_column_fetch_prop (data, Zkey, &RVK);//gets the column corresponding to the Zkey as the key/index of the returned array $         }Panax Notoginseng  - z_try_addref_p (zcolval); the         //array of Return values: Array (zkeyval=>zcolval,...) +         if(Zkeyval && z_type_p (zkeyval) = =is_string) { A zend_symtable_update (z_arrval_p (Return_value), z_str_p (Zkeyval), zcolval); the}Else if(Zkeyval && z_type_p (zkeyval) = =Is_long) { + Add_index_zval (Return_value, Z_lval_p (zkeyval), zcolval); -}Else if(Zkeyval && z_type_p (zkeyval) = =is_object) { $Zend_string *key =zval_get_string (zkeyval); $ zend_symtable_update (z_arrval_p (return_value), key, zcolval); - zend_string_release (key); -}Else { the             //If there is no zkeyval, the return value array is an indexed array - Add_next_index_zval (Return_value, zcolval);Wuyi         } the         /*Clean up memory*/ -         if(Zcolval = = &RVC) { WuZval_ptr_dtor (&RVC); -         } About         if(Zkeyval = = &RVK) { $Zval_ptr_dtor (&rvk); -         } - } zend_hash_foreach_end (); -}

PHP built-in function Analysis Array_column ()