isset($array[$value]) 功能，php程式碼如下<code><span><?php</span><span><span>class</span><span>Slash_Log</span> {</span><span>protected</span><span>static</span><span>$levels</span> = <span>array</span>(
<span>1</span> => <span>"ERROR"</span>,
<span>2</span> => <span>"WARNING"</span>,
<span>3</span> => <span>"INFO"</span>,
<span>4</span> => <span>"DEBUG"</span>,
);
<span>public</span><span><span>function</span><span>setLevel</span><span>(<span>$level</span>)</span> {</span><span>if</span> (!<span>isset</span>(<span>self</span>::<span>$levels</span>)) {
<span>throw</span><span>new</span><span>Exception</span>(<span>"Level is not allowed"</span>);
}
}
}</span></code><code>PHP_METHOD(slash_log, setLevel) {
<span>long</span> level;
zval *levels;
zend_class_entry *ce;
HashTable *levels_ht;
ce = Z_OBJCE_P(getThis());
<span>if</span> (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, <span>"l"</span>, &level) == FAILURE)
{
php_error_docref(NULL TSRMLS_CC, E_WARNING, <span>"Invalid argument"</span>);
RETURN_FALSE;
}
levels = zend_read_static_property(ce, ZEND_STRL(SL_P_LEVELS), <span>0</span> TSRMLS_DC);
levels_ht = Z_ARRVAL_P(levels);
<span>if</span> (!zend_hash_index_exists(levels_ht, level)) {
php_error_docref(NULL TSRMLS_CC, E_WARNING, <span>"Level is not allowed"</span>);
RETURN_FALSE;
}
zend_update_property_long(ce, getThis(), ZEND_STRL(SL_P_LEVEL), level TSRMLS_CC);
RETURN_TRUE;
}</code>上面的例子中，主要是使用zend_hash_index_exists 方法，關於操作有一系列的方法，關於操作有一系列操作的table 的操作有一系列操作，關於操作有一系列操作的table Zend/zend_hash.h
<code>ZEND_API <span>int</span> zend_hash_add_empty_element(HashTable *ht, <span>const</span><span>char</span> *arKey, uint nKeyLength); ZEND_API <span>int</span> zend_hash_del_key_or_index(HashTable *ht, <span>const</span><span>char</span> *arKey, uint nKeyLength, ulong h, <span>int</span> flag); ZEND_API <span>int</span> zend_hash_find(<span>const</span> HashTable *ht, <span>const</span><span>char</span> *arKey, uint nKeyLength, <span>void</span> **pData); ZEND_API <span>int</span> zend_hash_quick_find(<span>const</span> HashTable *ht, <span>const</span><span>char</span> *arKey, uint nKeyLength, ulong h, <span>void</span> **pData); ZEND_API <span>int</span> zend_hash_index_find(<span>const</span> HashTable *ht, ulong h, <span>void</span> **pData); ZEND_API <span>int</span> zend_hash_exists(<span>const</span> HashTable *ht, <span>const</span><span>char</span> *arKey, uint nKeyLength); ZEND_API <span>int</span> zend_hash_quick_exists(<span>const</span> HashTable *ht, <span>const</span><span>char</span> *arKey, uint nKeyLength, ulong h); ZEND_API <span>int</span> zend_hash_index_exists(<span>const</span> HashTable *ht, ulong h); ZEND_API <span>int</span> zend_hash_move_forward_ex(HashTable *ht, HashPosition *pos); ZEND_API <span>int</span> zend_hash_move_backwards_ex(HashTable *ht, HashPosition *pos); ZEND_API <span>int</span> zend_hash_get_current_key_ex(<span>const</span> HashTable *ht, <span>char</span> **str_index, uint *str_length, ulong *num_index, zend_bool duplicate, HashPosition *pos); ZEND_API <span>int</span> zend_hash_get_current_key_type_ex(HashTable *ht, HashPosition *pos); ZEND_API <span>int</span> zend_hash_get_current_data_ex(HashTable *ht, <span>void</span> **pData, HashPosition *pos); ZEND_API <span>int</span> zend_hash_update_current_key_ex(HashTable *ht, <span>int</span> key_type, <span>const</span><span>char</span> *str_index, uint str_length, ulong num_index, <span>int</span> mode, HashPosition *pos); ZEND_API <span>int</span> zend_hash_get_pointer(<span>const</span> HashTable *ht, HashPointer *ptr); ZEND_API <span>int</span> zend_hash_set_pointer(HashTable *ht, <span>const</span> HashPointer *ptr); ZEND_API <span>int</span> zend_hash_sort(HashTable *ht, sort_func_t sort_func, compare_func_t compare_func, <span>int</span> renumber TSRMLS_DC); ZEND_API <span>int</span> zend_hash_compare(HashTable *ht1, HashTable *ht2, compare_func_t compar, zend_bool ordered TSRMLS_DC); ZEND_API <span>int</span> zend_hash_minmax(<span>const</span> HashTable *ht, compare_func_t compar, <span>int</span> flag, <span>void</span> **pData TSRMLS_DC); ZEND_API <span>int</span> zend_hash_num_elements(<span>const</span> HashTable *ht); ZEND_API <span>int</span> zend_hash_rehash(HashTable *ht);</code>
以上就介紹了php擴充開發筆記（5）一些陣列操作相關的巨集和簡單範例，包含了方面的內容，希望對PHP教學有興趣的朋友有幫助。
