php常用函数

explode
implode
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_push


mysql
mysql_connect
mysql_query
mysql_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

REG
preg_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 string
str_replace --  Replace all occurrences of the search string with the replacement string 
str_rot13 -- Perform the rot13 transform on a string
str_shuffle -- Randomly shuffles a string
str_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 comparison
strcoll -- Locale based string comparison
strcspn --  Find length of initial segment not matching mask 
strip_tags -- Strip HTML and PHP tags from a string
stripcslashes --  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 length
strnatcasecmp --  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 string
strripos --  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 string
strtok -- Tokenize string
strtolower -- Make a string lowercase
strtoupper -- Make a string uppercase
strtr -- Translate certain characters
substr_compare --  Binary safe optionally case insensitive comparison of 2 strings from an offset, up to length characters 
substr_count -- Count the number of substring occurrences
substr_replace -- Replace text within a portion of a string
substr -- Return part of a string