php常用函数

explodeimplode数组类in_array -- 检查数组中是否存在某个值array --  新建一个数组 count -- 计算数组中的单元数目或对象中的属性个数range --  建立一个包含指定范围单元的数组array_key_exists -- 检查给定的键名或索引是否存在于数组中array_keys -- 返回数组中所有的键名array_map --  将回调函数作用到给定数组的单元上 array_merge_recursive -- 递归地合并一个或多个数组array_merge -- 合并一个或多个数组array_pushmysqlmysql_connectmysql_querymysql_select_db -- 选择 MySQL 数据库mysql_close -- 关闭 MySQL 连接mysql_fetch_array --  从结果集中取得一行作为关联数组，或数字数组，或二者兼有 mysql_fetch_assoc --  从结果集中取得一行作为关联数组 mysql_fetch_field --  从结果集中取得列信息并作为对象返回 mysql_fetch_lengths --  取得结果集中每个输出的长度 mysql_fetch_object -- 从结果集中取得一行作为对象mysql_fetch_row -- 从结果集中取得一行作为枚举数组REGpreg_match_all -- 进行全局正则表达式匹配preg_match -- 进行正则表达式匹配preg_quote -- 转义正则表达式字符preg_replace_callback -- 用回调函数执行正则表达式的搜索和替换preg_replace -- 执行正则表达式的搜索和替换preg_split -- 用正则表达式分割字符串ereg_replace -- 正则表达式替换ereg -- 正则表达式匹配eregi_replace -- 不区分大小写的正则表达式替换eregi -- 不区分大小写的正则表达式匹配split -- 用正则表达式将字符串分割到数组中spliti -- 用正则表达式不区分大小写将字符串分割到数组中sql_regcase -- 产生用于不区分大小的匹配的正则表达式字符串str_getcsv --  Parse a CSV string into an array str_ireplace --  Case-insensitive version of str_replace(). str_pad --  Pad a string to a certain length with another string str_repeat -- Repeat a stringstr_replace --  Replace all occurrences of the search string with the replacement string str_rot13 -- Perform the rot13 transform on a stringstr_shuffle -- Randomly shuffles a stringstr_split --  Convert a string to an array str_word_count --  Return information about words used in a string strcasecmp --  Binary safe case-insensitive string comparison strchr -- 别名 strstr()strcmp -- Binary safe string comparisonstrcoll -- Locale based string comparisonstrcspn --  Find length of initial segment not matching mask strip_tags -- Strip HTML and PHP tags from a stringstripcslashes --  Un-quote string quoted with addcslashes() stripos --  Find position of first occurrence of a case-insensitive string stripslashes --  Un-quote string quoted with addslashes() stristr --  Case-insensitive strstr() strlen -- Get string lengthstrnatcasecmp --  Case insensitive string comparisons using a "natural order" algorithm strnatcmp --  String comparisons using a "natural order" algorithm strncasecmp --  Binary safe case-insensitive string comparison of the first n characters strncmp --  Binary safe string comparison of the first n characters strpbrk --  Search a string for any of a set of characters strpos --  Find position of first occurrence of a string strrchr --  Find the last occurrence of a character in a string strrev -- Reverse a stringstrripos --  Find position of last occurrence of a case-insensitive string in a string strrpos --  Find position of last occurrence of a char in a string strspn --  Find length of initial segment matching mask strstr -- Find first occurrence of a stringstrtok -- Tokenize stringstrtolower -- Make a string lowercasestrtoupper -- Make a string uppercasestrtr -- Translate certain characterssubstr_compare --  Binary safe optionally case insensitive comparison of 2 strings from an offset, up to length characters substr_count -- Count the number of substring occurrencessubstr_replace -- Replace text within a portion of a stringsubstr -- Return part of a string