Some of the functions encountered in PHP network programming are briefly introduced

Introduction to PHP Network programming functions

1. Fgetcsv function-Parses a read-in row and finds fields in CSV format.

The Fgetcsv function resolves a read-in row and finds a field in CSV format, and then returns an array containing those fields.

Description of the Fgetcsv () function parameter:

Parameters	Description
Handle	Required parameters. Return file ID pointer after opening file
Length	Required parameters. Specifies the maximum number of characters that a row displays, which is greater than the number of characters in the longest line of the CSV file.
Delimiter	Optional parameters. The delimiter for the file
Enclosure	Optional parameters. The delimiter for the file

Example gets the number and contents of the CSV field that each row in the file gets separated by commas.

<? PHP      $row = 1;      $handle = fopen ("Test.csv", "R");      while ($data = Fgetcsv ($handle, +, ",")) {             $num = count ($data);             Print <p> $num has $num csv field on line $row: </br>\n ";             $row + +;             for ($c = 0; $c < $num; $c + +) {              print$data{$c}. " <br> ";}} Fcolse ($handle);? >

2. Fgets function – Gets the contents of the specified length of the line where the file pointer resides

"Syntax":

String fgets (inthandle,int length);

Parameter handle is a required parameter, which refers to the file identity that is returned when the file is successfully opened or connected to the server by applying the fopen () or fsockopen () function; The parameter length is an optional parameter that specifies the maximum number of bytes to read and returns the string of bytes that are length-1. Omit the default of 1024 bytes.

Example: Apply the Fgets () function to read the entire contents of the file.

<? PHP     $handle = fopen ("Test.txt", "R");     while (!feof ($handle)) {            $buffer = fgets ("$handle, 2048");            Echo $buffer;} Fclose ($handle);? >

3. Fwrite () function-writes a string to a file

The Fwrite function writes a string to the specified file and can specify the size of the write bytes.

Syntax

Int fwrite (Resource handle,string string, intlength)

The parameter handle is a required parameter, and the file identifies the pointer.

The argument string is a required parameter, and the string to write to the file.

The parameter length is an optional parameter, writing to the file, omitting all writes by default.

"Example" writes a string to a file.

<? PHP      $fp = fopen ("Test.txt", "w+");      $str = "Veaglefly";      If (!fwrite ($fp, $str)) {             Echo "file written successfully!"} else{       Echo "File write Failed! ":}?>

4. Fsockopen function-Open the network socket connection

Syntax

Int fsockopen (String hostname,int port,interrno,string errstr,int Timeout)

The parameter description of the Fsockopen () function:

Parameters	Description
Hostname	URLs and port numbers
Port
Errno	Used as error handling, can be ignored
Errstr
Timeout	Timeout period

After this function, a file pointer is returned for use by Fgets (), FGETSS (), fputs (), fclose (), feof (), and other file functions.

"Example" opens the socket connection to 127.0.0.1.

<? PHP      $fp = Fsockopen ("127.0.0.1");      If (! $fp) {             Echo "Connection failed";} else{       Echo "Connection succeeded";} Fclose ($FP);? >

5. Set_time_limit function-Set the maximum execution time of the script

The default time is 30s, and the parameter is in seconds.

6. Explode function-separating strings with separators

The function is to delimit the string with the specified delimiter, and to save the delimited string to the array and return it.

"Syntax" Array expode (string separator,string string,int limit)

The parameter separator is the delimiter to use, either a single character or a string.

The argument string represents the character to be delimited.

The parameter limit indicates the number to be delimited, and if it is negative, all elements except the last limit element are returned.

Example

<? PHP      $strings = "apples, bananas, pears";      $string = Explode (",", $string);      Print_r ($string);      Echo$string[0];? >

7. Implode function-concatenate array contents into a string

"Syntax" string implode (string Glue,array pieces)

The parameter glue is a connector, and the parameter pieces is an array to be merged.

Example

<? PHP      $str = "php*jsp*asp";      $str _arr=explode ("*", $str);      $array =implode ("*", $str _arr);      Echo$array;? >

8.parse_url Function-parses the URL and returns the array

The function returns an associative array and returns the results to the array, containing the various components of the URL. If one is missing, an array entry is not created for this component.

"Syntax" array parse_url (string url)

The Parse_url () function is specifically parsing the URL string and returning the result to the array.

The Parse_url function returns an array of elements that contain:

Elements	Description
Scheme	protocol used by the server program
Host	Host
Port	Port
User	User name
Pass	Password
Path	Path
Query	Query criteria, in? After
Fragment	After the hash symbol #

Example

<? PHP      $data = "HTTP://www.mingrisoft.com/mrbbs/index.php?id=8";      $str _url= Parse_url ($data);      while ($array =each ($str _url)) {             Echo "url[". $array ["Key"]. "] = ". $array [" Value "]." <br> ";}? >

Some of the functions encountered in PHP network programming are briefly introduced