PHP implements the five basic operations of data display, adding, modifying, deleting and querying text databases

PHP implements the five basic operations of data display, adding, modifying, deleting and querying text databases
This text database has a total of 9 fields: private $bankid; //Bank ID private $bankname; //Bank name private $bankimg; //Bank pictures private $bankarea; //Coverage area private $bankcard; //Card types accepted private $banklimit; //Payment limit private $bankpasswd; //Transaction password private $banknote; //Bank information remarks private $bankmiss; //Other information content of the bank.

/**
php implements the five basic operations of data display, adding, modifying, deleting and querying text databases.
This text database has a total of 9 fields:
 private $bankid; //Bank ID
 private $bankname; //Bank name
 private $bankimg; //Bank picture
 private $bankarea; //Covered area
 private $bankcard; //Accepted card types
 private $banklimit; //Payment limit
 private $bankpasswd; //Transaction password
 private $banknote; //Bank information notes
 private $bankmiss; //Other bank information.
@abstract TxtDB store
@access public
@author yuchao1@staff.sina.com.cn

*/

class TxtDB {

 private $bankid; //Bank ID
 private $bankname; //Bank name
 private $bankimg; //Bank picture
 private $bankarea; //covered area
 private $bankcard; //accepted card types
 private $banklimit; //payment limit
 private $bankpasswd; //transaction password
 private $banknote; //bank information remarks
 private $ bankmiss; //Other bank information


 public function __construct() {
 $bankid = ""; //Bank ID
 $bankname = ""; //Bank name
 $bankimg = ""; //Bank picture
 $bankarea = ""; //Covered area
 $bankcard = ""; //Accepted card types
 $banklimit = ""; //Payment limit
 $bankpasswd = ""; //Transaction password type
 $banknote = " "; //Bank information notes
 $bankmiss = ""; //Other bank information
 }
 /**
 * Add data program segment.
 * $bankinfo array List of bank information to be inserted
 * $bankinfo["bankid"]$bankinfo["bankname"]$bankinfo["bankimg"]$bankinfo["bankarea"]
 * $bankinfo["bankcard"] $bankinfo["banklimit"]
 * $bankinfo["bankpasswd"]$bankinfo["banknote"]$bankinfo["bankmiss"]
 * @return boolean true on success
 * false on failure
*/
 public static function insert($bankinfo) {
 $date = date ( "Y-m-d H: i:s" ); //Get the system time

 foreach ( $bankinfo as $key => $value ) {
 $key = trim ( $value ); //Remove the spaces after the bank content.
 }
 try {
 $fp = fopen ( "banklist.txt", "a" ); //Open the banklist.txt text file in write-only mode, with the file pointer pointing to the end of the file.
 $str = $bankinfo ["bankid"] . " |" . $bankinfo ["bankname"] . "|" . $bankinfo ["bankimg"] . "|" .
 $bankinfo ["bankarea"] . "|" . $bankinfo ["bankcard"] . "| " . $bankinfo ["banklimit"] . "|" .
 $bankinfo ["bankpasswd"] . "|" . $bankinfo ["banknote"] . "|" . $bankinfo ["bankmiss"] . "|" . $date . "rn";
 //Assign all bank data to the variable $str. The purpose of "|" is to use it as the data interval symbol when dividing data in the future.
 fwrite ($fp, $str); //Write data to the file
 fclose ($fp); //Close the file
 //The $banklist is the data passed from the bank form.
 return true;
 } catch (Exception $e) {
 return false;
 }
 }

 public static function show() {
 //Data display program segment
 if (file_exists ( "banklist.txt" )) { //Check whether the file exists
 $array = file ( "banklist.txt" ); // Read the entire contents of the file into the array $array
 $arr = array_reverse ( $array ); // Arrange the data in $array Flip the arrangement (i.e. the last row becomes the first row, and so on) and read each element of the array $arr ($arr[0]...).
 }
 var_dump ( $arr );
 }

 /**
 * Data modification program segment
 * $bankinfo array Bank information list to be inserted
 * $bankinfo["bankid"]$bankinfo["bankname"]$bankinfo["bankimg"]$bankinfo["bankarea"]
 * $ bankinfo["bankcard"]$bankinfo["banklimit"]
 * $bankinfo["bankpasswd"]$bankinfo["banknote"]$bankinfo["bankmiss"]
 * @return boolean true on success
 * false on failure
*/
 public static function alter($bankinfo) {
 $date = date ( "Y-m-d H:i:s" ); //Get System modification time
 $list = file ( "banklist.txt" ); //Read the entire banklist.txt file into the array $list, each element of the array is a bank ($list[0] is the data of the first bank , $list[1] is the first bank data....
 $n = count ( $list ); // Calculate the total number of banks in the $list content and assign it to the variable $n
 foreach ( $bankinfo as $key => $value ) {
 $key = trim ( $value ); //Remove the spaces after the bank content.
 }
 if ($n > 0) { //If the number of banks is greater than 0
 $fp = fopen ( "banklist.txt", "w" ); //Open the file banklist.txt in write-only mode

 for($i = 0; $i < $n; $i ++) { // Enter the loop
 if (eregi ( $bankinfo["bankid"], $list [$i] )) { // String matching and comparison of the passed bankid and the content in the array unit $list
 $f = explode ( "| ", $list [$i] ); //If a match is found, use "|" as the delimiter to cut the bank information $list[$i] (the $i-th bank), and assign these data to the array$ f
 $f[0] = $bankinfo["bankid"];
 $f[1] = $bankinfo["bankname"];
 $f[2] = $bankinfo["bankimg"];
 $f[ 3] = $bankinfo["bankarea"];
 $f[4] = $bankinfo["bankcard"];
 $f[5] = $bankinfo["banklimit"];
 $f[6] = $bankinfo ["bankpasswd"];
 $f[7] = $bankinfo["banknote"];
 $f[8] = $bankinfo["bankmiss"];
 $f[9] = $date;
 $list [ $i] = $f [0] . "|" . $f [1] . "|" . $f [2] . "|" . $f [3] . "|" . $f [4] . "|" . $f [5] . "|" . $f [6] . "|" . $f [7] . "|" . $f [8] . "|" . $f [9] . "rn";
 //Replace the contents of the array unit $list[$i] with the array $f plus the separator "|".
 break; //Get out of the loop
 }
 }//End of loop symbol
 }
 for($i = 0; $i <= $n; $i ++) { //Enter the loop
 fwrite ( $fp, $list [$i] ); //Convert each unit of the array $list into one line and write it to the file banklist.txt
 } //Loop end character
 fclose ( $fp ); // Close the file
 }
 /* *
 * Data deletion program segment
 * @param $bankid bank id number
 * @return boolean true success
 * false failure
 *
*/
 public static function delete($bankid) {
 $list = file ( "banklist.txt" ); //Read the entire banklist.txt file into the array $list, each element of the array is a bank ($list[0] is the data of the first bank, $list[1] is the data of the first bank...
 $n = count ( $list ); // Calculate the banks in the content of $list The total number and assigned to variable $n
 if ($n > 0) { //If the number of banks is greater than 0
 $fp = fopen ( "banklist.txt", "w" ); //Open the file in write-only mode banklist.txt
 for($i = 0; $i < $n; $i ++) { //Enter the loop
 if (eregi ( $bankid, $list [$i] )) { //Will be sent here Match and compare the bank's $bankid with the strings in the array $list[$i]
 $list [$i] = ""; //If the match is successful, $list[$i] will be cleared (to achieve the purpose of deletion) )
 break; //Jump out of the loop
 }
 } //Loop end character
 FOR($i = 0; $i <= $n; $i ++) { //Enter the loop
 fwrite ( $fp, $ list [$i] ); //Convert each unit of the array $list into one line and write it to the file banklist.txt
 } //Loop end character
 fclose ( $fp ); // Close the file
 }
 }

 /**
 * Data query program segment
 * @param $bankid bank ID number
 * @return boolean returns true on success
 * returns false on failure
 *
*/
 public static function select($bankid) {
 $id = 0;
 $list = file ( "banklist.txt" ); //Read the entire banklist.txt file into the array $list ,
 //Each element of the array is a bank ($list[0] is the data of the first bank, $list[1] is the data of the second bank...
 $n = count ( $list ); //Calculate the total number of banks in the $list content and assign it to the variable $n
 $bankid = trim ( $bankid );
 if (! $bankid) { //If $bankid is false
 echo "You did not enter anything Keyword! "; //For related display
 return false;
 } else {
 if ($n > 0) { //If the number of banks is greater than 0
 for($i = 0; $i < $n; $i + +) { //Enter the loop
 if (eregi ( $bankid, $list [$i] )) { // Match and compare the entered keywords with the strings in the array $list[$i]
 $row = explode ( "|", $list [$i] );
 $id = 1; //If a match is found, use "|" as the delimiter to cut the bank information $list[$i]($ith bank ), and assign these data to the array $row. And assign 1 to the variable $id to determine whether a match is found.
 list ($bankid,$bankname,$bankimg,$bankarea,$bankcard,$banklimit,$bankpasswd. ,$banknote,$bankmiss) = $row; //Assign the unit data in the array $row to the variables in the brackets in order
 //echo $bankname;
 return $row;
 }
 }//Loop end character
 }
 }
 if ($id == 0) {
 echo "No bank matching the keyword was found! ";
 return false;
 } //If $id=0, it means no match is found and relevant prompts are displayed


 }

 public function __destruct() {

 }
}
?>