PHP Concise function (PHP simple and clear function syntax) _php tips

1, with MySQL-related

Mysql_connect
Establish a connection to the MySQL server
Grammar


Resource mysql_connect (String server[,string usingname[,string password[, BOOL New_link[,int Client_flags]]]
eg

Copy Code code as follows:

$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
Grammar

BOOL Mysql_data_seek (Resource Result_indetifier,int row_number)
eg

Copy Code code as follows:

$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 pointer back to the first line of the query fruit

Mysql_fetch_array
To have the results of a query in an array (one record per array element)
Grammar

Array mysql_fetch_array (Resource Result[,int result_type])
eg

Copy Code code as follows:

$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
Gets a row of query results and stores them as object types, exactly the same as mysql_fetch_array (), except that mysql_fetch_object () can only get query results by field names
Echo $row->fieldname; Correct usage
Echo $row->0; Error usage
Grammar

Object Mysql_fetch_object (Resource result)
eg

Copy Code code as follows:

$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 àp_id;
echo $row Àp_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
Grammar

int mysql_insert_id ([esource Link_identifier])
eg

Copy Code code as follows:

$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
Get a few lines in the query results
Grammar

int mysql_num_rows (resource result)
eg

Copy Code code as follows:

$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 out a query statement with SQL syntax
Grammar

Resource mysql_query (String Query[,resource link_identifier])
eg

Copy Code code as follows:

$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 you want to access
Grammar

BOOL mysql_select_db (String Database_name[,resource link_identifier])
eg

Copy Code code as follows:

$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 function
Copy
Copy text
Grammar
BOOL Copy (string source,string dest)
eg

Copy Code code as follows:

Copy ("Abc.txt", "/tmp/newabc.txt");

Fclose
Close a pointer to an open file
Grammar
BOOL Fclose (Resource handle)
eg

Copy Code code as follows:

$FP =fopen ("Abc.txt", "w");
Fclose ($FP);

Fgets
Get the contents of a column from the point where the file pointer refers
Grammar
String fgets (Resource handle[,int length])
eg

Copy Code code as follows:

$FP =fopen ("Abc.txt", "w");
$txtdata = Fgets ($fp, 4096);

File
Read the entire contents of the file into an array
Grammar
Array file (string Filename[,int use_include_path[,resource context])
eg

Copy Code code as follows:

$content =file ("Abc.txt");

File_exists
Check to see if a file exists
Grammar

BOOL File_exists (string filename)
eg

Copy Code code as follows:

if (file_exists ("Abc.txt"))
echo "This file exists";
Else
echo "This file does not exist";

FileSize
Get File size
Grammar
int filesize (string filename)
eg

Copy Code code as follows:

$size =filesize ("Abc.txt");

fopen
Open a file or URL
Grammar
Resource fopen (string filename,string mode[,bool use-include_path[,resource Zcontext])
eg

Copy Code code as follows:

$FP =fopen ("Abc.txt");
$FP =fopen ("Http://www.jb51.net/bacteroid/", "R");

Fputs
Write data to a file
Grammar
int fputs (Resource handle,string string[,int length])
eg

Copy Code code as follows:

$FP =fopen ("Abc.txt");
Fputs ($fp, "helloworld!");

Fseek
Set the location of the file pointer
Grammar
int fseek (Resource handle,int offset[,int whence])
eg

Copy Code code as follows:

$FP =fopen ("Abc.txt", "w");
$txtdata =fgets ($fp, 4096);
Fseek ($fp, 0);//point the pointer back at the beginning

Mkdir
Create a Directory
Grammar
BOOL MkDir (String Pathname[,int mode[,bool Recursive[,resource Context]])
eg

Copy Code code as follows:

mkdir ("Ljt/newfolder");

Unlink
deleting files
Grammar
int unlink (string filename);
eg

Copy Code code as follows:

Unlink ("Abc.txt");

3, date and time function
Data
Returns the local time/date in the specified format
Grammar
String Date (string format[,int timestamp])
eg

Copy Code code as follows:

$time =date ("y-m-d g:i:s");

GetDate
Get information on date and time
Grammar
Array GetData ([int timestamp])
eg

Copy Code code as follows:

$now =getdate ();
$year = $now ["Year"];
$month = $now ["Month"];

Gettimeofday
Get the current time (including GMT)
Grammar
Array gettimeofday (void)
eg

Copy Code code as follows:

$time =gettimeofday ();

4, String processing functions
Explode
Splits a string into an array based on the specified delimiter
Grammar
Array explode (string separator,string string[,int limit])
eg

Copy Code code as follows:

$str = "A,b,c";
$res =explode (",", $str);/$res [0]=a

Implode
Concatenate the contents of an array into a string
Grammar
String implode (string Glue,array pieces)
eg

Copy Code code as follows:

$newarray =array (' A ', ' B ', ' C ');
$res =implode (",", $newarray);/$res =a,b,c

Strlen
Gets the length of the string
Grammar
int strlen (String string)
eg

Copy Code code as follows:

strlen ("www.jb51.net");/return 15
[C/ode]
Substr
Gets a part of the character specified by the string (substring)
Grammar
String substr ("www.gxnu.edu.cn", 1,7); Return to "Ww.gxnu"
5. Math Function Library
To place the decimal part of a floating-point number unconditionally
Grammar
float ceil (float value)
eg
[Code]
Echo Ceil (9.99);//Return 10
echo ceil (9.12);//Return 10

Cos
Gets the cosine of a floating-point value
Grammar
float cos (float arg)
eg

Copy Code code as follows:

$numcos =cos (0.5);

Floor
To remove the decimal part of a floating-point number unconditionally
Grammar
Float floor (floor value)
eg

Copy Code code as follows:

echo Floor (9.12);//Return 9
Echo Floor (9.99);//Return 9

Rand
Produces a range of random values
Grammar
I
NT rand ([int min,in Max])
eg

Copy Code code as follows:

$num =rand (0,100);//Generate a random number between 1 and 100

Round
Rounding the decimal part of a floating-point number
Grammar
Float round (float value)
eg

Copy Code code as follows:

Float Round (9.99)//return 10
Float round (9.12)//Return 9

Sin
Gets the sine value of a floating-point value
Grammar
Float sin (float arg)
eg

Copy Code code as follows:

$numsin =sin (0.5);

6. Session function
Session_register
Describe the variables in one or more sessions
Grammar
BOOL Session_register (mixed name[,mixed ...])
eg

Copy Code code as follows:

$name = "Flag";
Session_register ("name");

Session_Start
Initializing session information
Grammar
BOOL Session (void)
eg

Copy Code code as follows:

Session_Start ();

7. Array function
Count
There are several array functions in the computed array
Grammar
int count (mixed var[,int mode])
eg

Copy Code code as follows:

Count ($array);

List
Assign an element value in an array to a variable
Grammar
void list (mixed varname,mixed ...)
eg

Copy Code code as follows:

$array =array (A,B,C);
List ($str 1, $str 2, $str 3) = $array//$str 1=a

Range
Creates an array in the specified range
Grammar
Array range (int low,int high[,int Step])
eg

Copy Code code as follows:

$array =array (0,9);

Shuffle
To reorder elements in an array in random order
Grammar
BOOL Shuffle (array array)
eg

Copy Code code as follows:

Shuffle ($array);

Author: bacteria-like body