PHP file cache Content Save format instance analysis, _php tutorial

PHP file cache Content Save format instance analysis,

This article describes the PHP file cache content saving format, for PHP project development is very practical value. Share to everyone for reference. The specific analysis is as follows:

1, PHP file cache content Save format

PHP file cache Content storage format is mainly three kinds:

(1) Variable var_export formatted into PHP normal assignment writing format;
(2) The variable serialize is stored after serialization and is deserialized when used;
(3) The variable json_encode is saved after formatting, when used Json_decode

The test results on the Internet are as follows: The parsing efficiency of serialize format is greater than that of Json,json, which is higher than php normal assignment.
So if we cache the data, we suggest that parsing the data in serialized form is faster.

2. Simple case of PHP file cache

<?phpclass Cache_driver {//define the path of the cache protected $_cache_path; Gets the path information according to the Cache_path value in $config public function cache_driver ($config) {if (Is_array ($config) && isset ($config [    ' Cache_path ']) {$this->_cache_path = $config [' Cache_path ']; } else {$this->_cache_path = Realpath (dirname (__file__). "/") .    "/cache/"; }}//Determine if the file corresponding to the key value exists, if present, read value value, value to serialize store public function get ($id) {if (!file_exists ($this->_cache_path.    $id)) {return FALSE;    } $data = @file_get_contents ($this->_cache_path. $id);    $data = Unserialize ($data);    if (!is_array ($data) | |!isset ($data [' time ']) | |!isset ($data [' TTL '])) {return FALSE; if ($data [' ttl '] > 0 && time () > $data [' time '] + $data [' ttl ']) {@unlink ($this->_cache_path. $      ID);    return FALSE;  } return $data [' data ']; }//Set the cache information, generate the corresponding cache file according to the key value, Public function set ($id, $data, $ttl =) {$contents = array (' Time ' + Time () 'tTL ' = ' $ttl, ' data ' = $data); if (@file_put_contents ($this->_cache_path. $id, serialize ($contents))) {@chmod ($this->_cache_path. $id, 0777      );    return TRUE;  } return FALSE;  }//Delete cache file according to key value public function Delete ($id) {return @unlink ($this->_cache_path. $id);    Public Function Clean () {$DH = @opendir ($this->_cache_path);    if (! $dh) return FALSE;      while ($file = @readdir ($DH)) {if ($file = =). "| | $file = =".. ") continue; $path = $this->_cache_path. "/" .      $file;    if (Is_file ($path)) @unlink ($path);    } @closedir ($DH);  return TRUE; }}

I hope that the PHP cache instance described in this article will help you to develop PHP program.

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