


mysql can be connected to the web through PHP in two ways, one through php's mysql related functions, and the other through php's ODBC related functions
The relevant functions are as follows:
MYSQL function
mysql_affected_rows: Get the number of columns affected by the last MySQL operation.
mysql_close: Close the MySQL server connection.
mysql_connect: Open the MySQL server connection.
mysql_create_db: Create a new MySQL database.
mysql_data_seek: Move internal return indicators.
mysql_db_query: Send query string (query) to the MySQL database.
mysql_drop_db: Remove the database.
mysql_errno: Returns the error message code.
mysql_error: Returns an error message.
mysql_fetch_array: Returns array data.
mysql_fetch_field: Get field information.
mysql_fetch_lengths: Returns the maximum length of each column of data in a single column.
mysql_fetch_object: Returns object data.
mysql_fetch_row: Returns each column of a single column.
mysql_field_name: Returns the name of the specified field.
mysql_field_seek: Set the indicator to a field of the returned value.
mysql_field_table: Get the name of the data table (table) of the current field.
mysql_field_type: Get the type of the current field.
mysql_field_flags: Get the flags of the current field.
mysql_field_len: Get the length of the current field.
mysql_free_result: Release the occupied memory returned.
mysql_insert_id: Returns the ID of the last INSERT command used.
mysql_list_fields: List the fields (fields) of the specified data table.
mysql_list_dbs: Lists the databases available on the MySQL server.
mysql_list_tables: Lists the tables (tables) of the specified database.
mysql_num_fields: Get the number of fields returned.
mysql_num_rows: Get the number of columns returned.
mysql_pconnect: Enable long-term connection to the MySQL server.
mysql_query: Send a query string.
mysql_result: Get the results of the query.
mysql_select_db: Select a database.
mysql_tablename: Get the name of the data table.
ODBC function
To use ODBC functions, you need to install MYSQL ODBC
odbc_autocommit: Switch the automatic change function.
odbc_binmode: Set the binary data processing method.
odbc_close: Close the ODBC connection.
odbc_close_all: Close all ODBC connections.
odbc_commit: Update the ODBC database.
odbc_connect: Connect to ODBC database.
odbc_cursor: Get the cursor name.
odbc_do: Execute SQL instructions.
odbc_exec: Execute SQL instructions.
odbc_execute: Execute preset SQL instructions.
odbc_fetch_into: Get the specified column returned.
odbc_fetch_row: Get and return a column.
odbc_field_name: Get the field name.
odbc_field_type: Get the field data form.
odbc_field_len: Get the field data length.
odbc_free_result: Release the memory of the returned data.
odbc_longreadlen: Set the maximum value of the returned column.
odbc_num_fields: Get the number of fields.
odbc_pconnect: Long-term connection to ODBC database.
odbc_prepare: Preset SQL instructions.
odbc_num_rows: Get the number of returned columns.
odbc_result: Get the returned data.
odbc_result_all: Returns HTML table data.
odbc_rollback: Undo the current transaction.
odbc_setoption: Adjust ODBC settings.

php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($number))”;2、利用“~”位运算符将负数取反加一,语法“~$number + 1”。

实现方法:1、使用“sleep(延迟秒数)”语句,可延迟执行函数若干秒;2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句,可延迟执行函数若干秒和纳秒;3、使用“time_sleep_until(time()+7)”语句。

php除以100保留两位小数的方法:1、利用“/”运算符进行除法运算,语法“数值 / 100”;2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值,并保留两位小数。

判断方法:1、使用“strtotime("年-月-日")”语句将给定的年月日转换为时间戳格式;2、用“date("z",时间戳)+1”语句计算指定时间戳是一年的第几天。date()返回的天数是从0开始计算的,因此真实天数需要在此基础上加1。

php字符串有下标。在PHP中,下标不仅可以应用于数组和对象,还可应用于字符串,利用字符串的下标和中括号“[]”可以访问指定索引位置的字符,并对该字符进行读写,语法“字符串名[下标值]”;字符串的下标值(索引值)只能是整数类型,起始值为0。

在php中,可以使用substr()函数来读取字符串后几个字符,只需要将该函数的第二个参数设置为负值,第三个参数省略即可;语法为“substr(字符串,-n)”,表示读取从字符串结尾处向前数第n个字符开始,直到字符串结尾的全部字符。

方法:1、用“str_replace(" ","其他字符",$str)”语句,可将nbsp符替换为其他字符;2、用“preg_replace("/(\s|\ \;||\xc2\xa0)/","其他字符",$str)”语句。

php判断有没有小数点的方法:1、使用“strpos(数字字符串,'.')”语法,如果返回小数点在字符串中第一次出现的位置,则有小数点;2、使用“strrpos(数字字符串,'.')”语句,如果返回小数点在字符串中最后一次出现的位置,则有。


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