Simple PHP Functions

Introduction: This is a detailed page for PHP simple functions. It introduces the related knowledge, skills, experience, and some PHP source code.

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Simple PHP Functions

Topic: simple PHP Functions

Brief Introduction: PHP is simple and clear function syntax

Target Audience: Open SourceCommunityInterested, interested in PHP, a little time to understand PHP

Note: I hope you can still give bricks.

1. Related to MySQL

Mysql_connect

 

Establish a connection with the MySQL server

Syntax

Resource mysql_connect (string server [, string usingname [, string password [,
Bool new_link [, int client_flags])

Eg:

$ Db_host = "localhost ";

$ Db_login = "root ";

$ Db_password = "123456 ";

$ Conn = mysql_connect ($ db_host, $ db_login, $ db_password );

Mysql_data_seek

 

Move the internal query pointer to the query row

Syntax

Bool mysql_data_seek (resource result_indetifier, int row_number)

Eg:

$ Db_host = "localhost ";

$ Db_login = "root ";

$ Db_password = "123456 ";

$ Db_name = "flag ";

$ Conn = mysql_connect ($ db_host, $ db_login, $ db_password );

Mysql_select_db ($ db_name );

$ Res = mysql_query ("select * from product ");

$ ROW = mysql_fetch_array ($ res );

For ($ I = 0; $ I <$ num; $ I ++)

$ ROW = mysql_fetch_array ($ res );

Mysql_data_seek ($ res, 0); // move the pointer back to the first row of the query result

Mysql_fetch_array

 

Store the query results in an array (one record for each array element)

Syntax

Array mysql_fetch_array (resource result [, int result_type])

Eg

$ Db_host = "localhost ";

$ Db_login = "root ";

$ Db_password = "123456 ";

$ Db_name = "flag ";

$ Conn = mysql_connect ($ db_host, $ db_login, $ db_password );

Mysql_select_db ($ db_name );

$ Res = mysql_query ("select * from product ");

$ ROW = mysql_fetch_array ($ res );

Mysql_fetch_object

 

A row of query results is obtained and stored as an object. The usage of mysql_fetch_array () is the same. The difference is that mysql_fetch_object () can only obtain query results by field name.

Echo $ row-> fieldname; // correct usage

Echo $ row-> 0; // incorrect usage

Syntax

Object mysql_fetch_object (resource result)

Eg

$ Db_host = "localhost ";

$ Db_login = "root ";

$ Db_password = "123456 ";

$ Db_name = "flag ";

$ Conn = mysql_connect ($ db_host, $ db_login, $ db_password );

Mysql_select_db ($ db_name );

$ Res = mysql_query ("select * from product ");

$ ROW = $ mysql_fetch_object ($ res );

While ($ row)

{
Echo $ row à P _ id;
Echo $ row à P _ name;

}

Mysql_insert_id

After adding a message using the INSERT command, you can use this function to obtain the unique ID of the newly added record.

Syntax

Int mysql_insert_id ([esource link_identifier])

Eg

$ Db_host = "localhost ";

$ Db_login = "root ";

$ Db_password = "123456 ";

$ Db_name = "flag ";

$ Conn = mysql_connect ($ db_host, $ db_login, $ db_password );

Mysql_select_db ($ db_name );

$ Sqlstr "insert into produce (p_id, p_name) values ('', 'php Book ')";

$ Res = mysql_query ($ res );

$ P_id = mysql_insert_id ();

Mysql_num_rows

There are several rows in the query result.

Syntax

Int mysql_num_rows (resource result)

Eg

$ Db_host = "localhost ";

$ Db_login = "root ";

$ Db_password = "123456 ";

$ Db_name = "flag ";

$ Conn = mysql_connect ($ db_host, $ db_login, $ db_password );

Mysql_select_db ($ db_name );

$ Res = mysql_query ("select * from product ");

$ Num = mysql_num_rows ($ res );

Mysql_query

Send a query statement of SQL syntax

Syntax

Resource mysql_query (string Query [, resource link_identifier])

Eg

$ Db_host = "localhost ";

$ Db_login = "root ";

$ Db_password = "123456 ";

$ Db_name = "flag ";

$ Conn = mysql_connect ($ db_host, $ db_login, $ db_password );

Mysql_select_db ($ db_name );

$ Res = mysql_query ("select * from product ");

Mysql_select_db

Select the name of the database to be accessed

Syntax

Bool mysql_select_db (string database_name [, resource link_identifier])

Eg

$ Db_host = "localhost ";

$ Db_login = "root ";

$ Db_password = "123456 ";

$ Db_name = "flag ";

$ Conn = mysql_connect ($ db_host, $ db_login, $ db_password );

Mysql_select_db ($ db_name );

2. File System Functions

Copy

Copy text

Syntax

Bool copy (string source, string DEST)

Eg

Copy(“abc.txt ","/tmp/newabc.txt ");

Fclose

Close a pointer to open a file

Syntax

Bool fclose (resource handle)

Eg

$Fpw.fopen(“abc.txt "," W ");

Fclose ($ FP );

Fgets

Retrieve the column content from the position indicated by the file pointer

Syntax

String fgets (resource handle [, int length])

Eg

$Fpw.fopen(“abc.txt "," W ");

$ Txtdata = fgets ($ FP, 4096 );

File

Read the entire file content to the array

Syntax

Array file (string filename [, int use_include_path [, resource context])

Eg

$Content1_file(“abc.txt ");

File_exists

Check whether the file exists

Syntax

Bool file_exists (string filename)

Eg

If (file_exists(“abc.txt "))
Echo "this file exists ";

Else

Echo "this file does not exist ";

Filesize

Get File Size

Syntax

Int filesize (string filename)

Eg

Inclusizeinclufilesize(“abc.txt ");

Fopen

Open a file or URL

Syntax

Resource fopen (string filename, string mode [, bool use-include_path [, Resource
Zcontext])

Eg

$Fp=fopen(“abc.txt ");

$ Fp = fopen ("http://www.cnblogs.com/bacteroid/#,”r ");

Fputs

Write data to a file

Syntax

Int fputs (resource handle, string [, int length])

Eg

$Fp=fopen(“abc.txt ");

Fputs ($ FP, "helloworld !");

Fseek

Set the position indicated by the file pointer

Syntax

Int fseek (resource handle, int offset [, int whence])

Eg

$Fpw.fopen(“abc.txt "," W ");

$ Txtdata = fgets ($ FP, 4096 );

Fseek ($ FP, 0); // point the pointer back to the starting position

Mkdir

Create a directory

Syntax

Bool mkdir (string pathname [, int mode [, bool recursive [, Resource
Context])

Eg

Mkdir ("ljt/newfolder ");

Unlink

Delete an object

Syntax

Int unlink (string filename );

Eg

Unlink(cmdabc.txt ");

 

3. Date and Time Functions

Data

Returns the local time/date in the specified format.

Syntax

String date (string format [, int timestamp])

Eg

$ Time = date ("Y-m-d G: I: S ");

Getdate

Obtain date and time information

Syntax

Array getdata ([int timestamp])

Eg

$ Now = getdate ();

$ Year = $ now ["year"];

$ Month = $ now ["month"];

Gettimeofday

Obtain the current time (including Greenwich Mean Time)

Syntax

Array gettimeofday (void)

Eg

$ Time = gettimeofday ();

 

4. string processing functions

Explode

Splits a string into an Array Based on the specified delimiter.

Syntax

Array explode (string separator, string [, int limit])

Eg

$ STR = "A, B, C ";

$ Res = explode (",", $ Str); // $ res [0] =

Implode

Concatenates the array content into a string

Syntax

String implode (string glue, array pieces)

Eg

$ Newarray = array ('A', 'B', 'C ');

$ Res = implode (",", $ newarray); // $ res = a, B, c

Strlen

Returns the length of a string.

Syntax

Int strlen (string)

Eg

Strlen ("www.gxnu.edu.cn"); // returns 15

Substr

Obtains a specified part of the character string (sub-string)

Syntax

String substr ("www.gxnu.edu.cn",); // return "ww. gxnu"

5. mathematical function library

Ceil

Unconditionally carry the decimal part of the Floating Point Number

Syntax

Float Ceil (float value)

Eg

Echo Ceil (9.99); // returns 10

Echo Ceil (9.12); // returns 10

Cos

Returns the cosine of a floating point value.

Syntax

Float cos (float Arg)

Eg

$ Numcos = cos (0.5 );

Floor

Remove the decimal part of the floating point number unconditionally.

Syntax

Float floor (floor value)

Eg

Echo floor (9.12); // return 9

Echo floor (9.99); // return 9

Rand

Generates a random value in a range.

Syntax

Int rand ([int min, in Max])

Eg

$ Num = rand (0,100); // generates a random value between 1 and 100.

Round

Rounds the decimal part of a floating point number to carry.

Syntax

Float round (float value)

Eg

Float round (9.99) // returns 10

Float round (9.12) // return 9

Sin

Returns the sine of a floating point value.

Syntax

Float sin (float Arg)

Eg

$ Numsin = sin (0.5 );

6. SessionFunction

Session_register

Description: variables in one or more sessions

Syntax

Bool session_register (mixed name [, mixed...])

Eg

$ Name = "flag ";

Session_register ("name ");

Session_start

Initialize session information

Syntax

Bool SESSION (void)

Eg

Session_start ();

7,Array Functions

Count

There are several array functions in the calculation array.

Syntax

Int count (mixed var [, int mode])

Eg

Count ($ array );

List

Assign the element values in the array to the variable.

Syntax

Void list (mixed varname, mixed ...)

Eg

$ Array = array (A, B, C );

List ($ str1, $ str2, $ str3) = $ array; // $ str1 =

Range

Creates an array within the specified range.

Syntax

Array range (INT low, int high [, int step])

Eg

$ Array = array (0, 9 );

Shuffle

Re-random sorting of elements in the array

Syntax

Bool shuffle (array)

Eg

Shuffle ($ array );

Author: bacteroid

Source: http://www.cnblogs.com/bacteroid/

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