Example of using multiple processes to control file read/write simultaneously in php

Example of using multiple processes to control file read/write simultaneously in php

This article mainly introduces the example of using multiple processes to simultaneously Control File Read/write in php. For more information, see

The Code is as follows:

<? Php

/**

* Write data

* @ Param [string] $ path [file path]

* @ Param [string] $ mode [file opening mode]

* @ Param [string] $ data [data]

* @ Return [bool]

*/

Function writeData ($ path, $ mode, $ data ){

$ Fp = fopen ($ path, $ mode );

$ Retries = 0;

$ Max_retries = 100;

Do {

If ($ retries> 0 ){

Usleep (rand (1, 10000 ));

}

$ Retries + = 1;

} While (! Flock ($ fp, LOCK_EX) and $ retries <= $ max_retries );

If ($ retries = $ max_retries ){

Return false;

}

Fwrite ($ fp, $ data. "rn ");

Flock ($ fp, LOCK_UN );

Fclose ($ fp );

Return true;

}

 

 

/**

* Read data

* @ Param [string] $ path [file path]

* @ Param [string] $ mode [file opening mode]

* @ Return string

*/

Function readData ($ path, $ mode ){

$ Fp = fopen ($ path, $ mode );

$ Retries = 0;

$ Max_retries = 100;

Do {

If ($ retries> 0 ){

Usleep (rand (1, 10000 ));

}

$ Retries + = 1;

} While (! Flock ($ fp, LOCK_SH) and $ retries <= $ max_retries );

If ($ retries = $ max_retries ){

Return false;

}

$ Contents = "";

While (! Feof ($ fp )){

$ Contents. = fread ($ fp, 8192 );

}

Flock ($ fp, LOCK_UN );

Fclose ($ fp );

Return $ contents;

}

 

WriteData ('d:/webServer/demo.txt ', 'a +', 'This is a demo ');

Echo readData ('d:/webServer ', 'r + ');